Publication
Python Best Practices and Tips by Toptal Developers
https://www.toptal.com/developers/python/tips-and-practices
Vu is available for hire
Hire VuVu Quang Hoa
Verified Expert in Engineering
Software Developer
Hanoi, Vietnam
Toptal member since August 9, 2016
Bio
Hoa, nicknamed Joe, is a brilliant engineer capable of grasping new concepts very quickly. His most striking quality is the commitment he shows in whatever he does. He specializes in full-stack, highly scalable Python-Django applications. He has over 10 years of experience developing applications on the Django framework at many companies worldwide, one of them being the StoryTree company—one of the top 500 startups in the US.
Portfolio
MCA Financial Group, LLC
Python, QuickBooks Desktop, REST APIs, SQL, Clio API, Claude, QuickBooks API...
MVL
React, Python 3, Django, LLM Agents, Claude, TypeScript, HTML5, CSS3...
Online And, LLC (dba 24HourViews)
Python, JavaScript, APIs, React, Amazon Web Services (AWS), LangGraph...
Experience
- Git - 14 years
- Python - 14 years
- Django REST Framework - 14 years
- Django - 14 years
- Celery - 10 years
- RESTful Development - 10 years
- Node.js - 9 years
- Clean Code - 7 years
Preferred Environment
Python 3, Django, Celery, ChatGPT, Redis, Docker, Vue, Node.js, Microsoft AI, Amazon
The most amazing...
...thing I've built was the query page app which turns SQL commands into an analytics page with graphs and a variety of input types (date, time, number, & string).
Work Experience
Back-end Developer
2026 - PRESENT
MCA Financial Group, LLC
- Integrated with Clio Management API, refined and investigated what info to pull to build reports for different officers and roles.
- Used Claude AI to design, implement, and test the application. Optimized the performance with Cache and database query optimization.
- Integrated with QuickBooks Online to pull data for matching money out/in to compare with Clio Management data. Used AI to identify the problems and email the clients when it finds one.
Technologies: Python, QuickBooks Desktop, REST APIs, SQL, Clio API, Claude, QuickBooks API, QuickBooks Online, Reports, Next.js, FastAPI, Cache, Redis, Railway, PostgreSQL, Amazon S3 (AWS S3)
Full-stack Developer
2025 - 2026
MVL
- Conducted a global PropTech market study (US, China, SEA trends: broker licensing, market consolidation, embedded fintech, rental shift) and translated it into a 5-year digital vision for a brokerage with 1,200+ agents.
- Designed the complete product architecture for 5 connected systems: sales app, CRM and marketing automation, ERP, HRM, and a shared AI core—one data backbone, not five silos.
- Produced 81 high-fidelity screen designs (38 web and 43 mobile) covering 6 user roles: customer, collaborator (CTV), internal sales, sales manager, content editor, and admin.
- Built an interactive executive dashboard prototype with an AI chat layer that answers leadership questions strictly from real system data—no hallucinated numbers.
- Mapped 13 end-to-end business workflows (lead intake, ad-spend reconciliation, unit reservation, commission calculation) and caught real money leaks: 14.2% ad overspend and lost spend data discovered only at period end.
- Scoped, estimated, and priced the full 7-month program with weekly milestones, acceptance criteria, and payment tied to demos, not promises.
- Automated marketing reports: cost-per-lead by channel and project, campaign ROI, and ad-invoice reconciliation that flags overspend during the period instead of after it.
- Scheduled digest reports per audience: leadership gets market insights, agents get hot-unit lists and leads needing attention, developers get sales progress.
- Scraped real estate data from different sources (including news, project, pricing, listing, and owner sites) to build a proper knowledge base for the AI agent.
Technologies: React, Python 3, Django, LLM Agents, Claude, TypeScript, HTML5, CSS3, PostgreSQL, Redis, Celery, Next.js, Docker, Claude Code, Artificial Intelligence (AI), Large Language Models (LLMs), Data Privacy, Multi-agent Systems
Senior Software Developer
2024 - 2026
Online And, LLC (dba 24HourViews)
- Set up and installed the Matomo system to track many eCommerce sites. Optimized the system and configured the website tracking database in AWS to scale quickly.
- Set up and synced data from different sources to a single database using Airbyte, QuickSight, and S3 Buckets.
- Built an email AI system to automatically answer customer support questions via email. This AI pulls data from different sources (knowledge base in AWS BedRock, eCommerce Site, and warehouse management).
- Integrated with Shopify and BigCommerce APIs to sync data frequently via webhooks and feed AI data.
- Set up and built the AWS QuickSight dashboard, whose data is pulled from different sources.
- Integrated with Google Ads to enhance conversion rates via different methods (S3 sync and URLs).
- Designed a data pipeline with Airbyte and AWS S3, instead of AWS RDS or Redshift. Optimized the data query cost.
- Used Claude and Cursor to automate coding tasks, integrated with ClickUp for task creation, and Slack for notification messages.
Technologies: Python, JavaScript, APIs, React, Amazon Web Services (AWS), LangGraph, LangChain, ChatGPT, ChatGPT API, Gemini, Amazon S3 (AWS S3), AWS Lambda, AWS Glue, Amazon QuickSight, AWS Database Management System, Shopify, Shopify API, BigCommerce API, BigCommerce, Google Ads, Matomo, Airbyte, Amazon Bedrock AgentCore, Claude, Claude Code, Cursor AI, ClickUp, Slack
Web Developer
2025 - 2025
Parallax Veterinary Partners LLC
- Built a Google App script to load Excel files in different formats and processes.
- Adjusted the Google App Script UI/UX to fit with different users and use cases.
- Optimized the app script to run faster, log all details, and set up error notifications using Sentry.
- Customized the landing page using React and Strapi from a custom design (using Figma).
- Defined rules, constraints, or guardrails for agent behavior and tried different prompt engineering with different knowledge bases to achieve the best result.
Technologies: Python, PostgreSQL, CSV File Processing, REST APIs, Google Sheets API, Zapier, Email Automation, Google Apps Script, Strapi, React, Gemini API, Gemini, Front-end Development
Python Developer
2025 - 2025
Isidor, Inc.
- Built Excel processing and data labeling with Pandas and Polars for different cases.
- Defined and designed the output of the Excel processing logic so that report tools can use it to create charts in different formats.
- Built a Lambda function in AWS, as this is not run hourly/daily, deployed using AWS-CLI.
- Discussed and brainstormed issues with the owners to build a proper data processing pipeline dynamically and reliably.
- Designing structured instruction systems with Gemini Code to build a consistent extraction system and deploy it in the Google App Engine.
Technologies: Google API, Python, Google Sheets API, Data Engineering, Google Sheets, Artificial Intelligence (AI), Claude, Claude Code, Codex, Gemini, Gemini API
Python Web Scraper
2024 - 2024
Benjamin Mammon
- Scraped Yahoo stock data using Python yahoo-finance package - https://github.com/ranaroussi/yfinance.
- Scraped Barchart stock market data (https://www.barchart.com/) using PlayWright.
- Exported scraped data as Google Excel using Google API.
- Captured errors automatically using Sentry and stored daily data in a database for later re-usage.
Technologies: Python, Data Scraping, Website Data Scraping, Web Scraping, APIs, HTML, JavaScript, Node.js, Beautiful Soup, Google Sheets, Financial APIs, Financial Data, Stock Market
Web Scraper
2024 - 2024
Daniel Equine Services LLC
- Implemented a PlayWright bot to collect FEI data for horses and racers.
- Overcame the difficulties of Google reCAPTCHA and dynamic pagination issues with FEI data - https://www.fei.org/.
- Exported scraped data to CSV and JSON format, then loaded to a Postgres database for further data analysis.
Technologies: Website Data Scraping, Data Scraping, Python, Web Scraping, Selenium, ChatGPT Prompts
Senior Web Scraping Developer
2024 - 2024
Lotto Edge
- Maintained the Lambda functions to collect lottery information.
- Created reports based on the collected data, and output Excel/CSV files according to the required format.
- Speeded up the current scraping system and optimize the scraper code (do not use the infinite scheduler; use a cronjob with a smaller amount of data).
- Designed and created database for better lookup and querying.
Technologies: Python, Web Scraping, Amazon Web Services (AWS), Selenium, Beautiful Soup, Data Analytics, Optical Character Recognition (OCR), Amazon Textract, Lottery, Amazon S3 (AWS S3), AWS Lambda
Full-stack Developer
2024 - 2024
Toptal Client
- Scraped product details from these websites: winsupplyinc.com, ferguson.com, supplyhouse.com, and supplyhouse.com.
- Designed an electrical and water equipment database and inserted scraped data into the Django models.
- Integrated Scrapy, Scrapyd, and Django to stream Scrapy logs and automatically call Scrapyd from the Django admin app.
- Researched and implemented a scraping system to automatically collect data on demand to serve dynamic search on the website.
- Experienced OpenAI to automatically scrape data in a structured format so we can optimize the extracting process faster.
Technologies: Web Scraping, Python, MERN Stack, Amazon Web Services (AWS), Azure, Google Cloud Platform (GCP), ChatGPT API, Playwright, Selenium, Scrapy, Scrapyd, Django
Full-stack Developer (via Toptal)
2024 - 2024
Thomas Robb
- Designed, implemented, and maintained a complicated scraping application with Google News.
- Integrated Scrapy, Scrapyd, and Django to run scrapers and stream logs easily.
- Designed and implemented the data flow using Scrapy and Django PostgreSQL.
- Enhanced the Django admin to adapt with many filters/actions and admin dashboards.
Technologies: HTML, Scrapy, JavaScript, CSS, Data Scraping, APIs, MySQL, Python, OpenAI, PHP, Laravel, Django, Django REST Framework, Scrapyd, Web Crawlers, Newsfeeds, News, Newspapers, Web Scraping
Full-stack Web Developer
2024 - 2024
Schoolmaster.io
- Brainstormed the ideas, scraped data using ChatGPT, and discussed with the owner to consult him on how to build the app with minimum features.
- Designed database and system architecture for the whole system. Planned the project timeline and milestones.
- Worked closely with the designer and owner to develop a reasonable design and user flow.
- Built a fancy UI/UX, different pages (dashboard, authentication, admission) with complicated logic regarding the application process using Angular.
- Integrated the front end with the back end RESTful APIs.
- Integrated with Stripe for the subscription feature and direct payment process.
- Integrated with SendGrid to send email, Sentry for error reporting, and NewRelict for performance tracking.
- Designed and implemented RESTful APIs using Django, DRF, Celery, and Redis.
- Maintained high-quality code using pre-commit, isort, Flake8, Black, and other libraries.
Technologies: Python, Databases, Web Scraping, Data Scraping, Back-end, JavaScript, Django, Node.js, Angular, Angular 6, AngularJS, React, Redux, Stripe API, Front-end Development
Full-stack Engineer
2024 - 2024
Quantlink, Inc.
- Configured auto-deployment on GitHub CI/CD using Amazon EC2, Nginx, Supervisord, and uWSGI (React and Django).
- Implemented Docker Compose and Docker files for many services in the same container.
- Customized the Django admin with multiple filters and added some custom admin pages.
- Analyzed and optimized Django query sets in admin and views using SQLInspect and Django debug toolbar.
- Refactored React views, components, and customized authentication components.
Technologies: Amazon Web Services (AWS), Python, React, Django, Cloud Deployment, Full-stack Development, Docker, Docker Compose, Amazon EC2, GitHub, CI/CD Pipelines, Redis, Redis Cache, Celery, OpenAI GPT-4 API, OpenAI, ChatGPT, ChatGPT API, CSV File Processing, TypeScript, Vite, Chart.js, D3.js, Amazon EC2 API, PostgreSQL, Front-end Development
Scraping/CRM Developer
2024 - 2024
Miguel Pinto
- Created an automation bot to scrape corporation information from the Sunbiz website.
- Scraped LexisNexis to collect customer phone and email.
- Integrated with ChatGPT to extract human names from PDF files.
- Deployed and managed AWS Lambda functions and Amazon EC2 servers.
- Integrated with Salesforce API to update document information and create leads.
- Scraped different counties to collect properties and PDF documentation.
Technologies: Python, Web Scraping, ChatGPT, Salesforce, Amazon Web Services (AWS), Twilio, APIs, Scrapy, Beautiful Soup, Playwright, Selenium, AWS Lambda, Amazon EC2, Puppeteer
Python Back-end Developer
2023 - 2024
TheFutureOfAccounting
- Integrated with QuickBooks to collect invoice data and customer data (https://github.com/ej2/python-quickbooks).
- Integrated with Karbon to automatically create tickets after reviewing the QuickBooks Invoices.
- Designed and built accounting reviewing flows and scheduled them to run hourly/daily depending on the user's requirements.
- Implemented a user dashboard for managing accounting flows using the Django framework.
- Managed background tasks using Celery and set up server configurations and autoscaling to match users' requests.
Technologies: Python, Google Cloud Engine, Intuit QuickBooks, Google Cloud Platform (GCP), Offshore Team Management, APIs, Make (formerly Integromat), API Integration, Ticket Systems, Stripe, SendGrid, Mailchimp
Scraping/CRM Expert (via Toptal)
2023 - 2024
Jason Abitbol PA
- Designed and implemented a CRM flow system to allow more sales to work with customers and properties.
- Built a scraper tool to collect corporation information from Sunbiz.
- Implemented LexisNexis scraper to collect customers' phone numbers and emails.
- Used Django-import-export to import/extract Excel files that contain different formats and data from another CRM application.
- Utilized django CMS for the content management system with blogs, posts, images, videos, and pages.
- Adjusted the Django admin to provide more filters and custom pages with report charts using Chart.js.
Technologies: Scraping, Data Scraping, Web Scraping, JavaScript, Python, Django, Django CMS, Celery, Redis, Sunbiz, LexisNexis
Senior Python Developer
2023 - 2024
Maxeon - Main
- Designed and built the Django web application to manage email content, classification, sentences, and labels.
- Implemented RESTful APIs for email classification, labeling, and prediction.
- Designed the email processing flow, encompassing email extraction, email embedding value calculation, comparison, and return. Built the entire flow using Django, Celery, and Redis.
- Brainstormed and discussed directly with the manager about the project deadline, tasks, and plan. Contributed actively to the project development.
- Optimized the email classification and extraction speed.
- Utilized OpenAI ChatGPT 4 for classification, embedding calculation, and chat completion.
Technologies: Python, API Integration, Azure, SQL, Web Servers, Cloud Deployment, System Architecture, OpenAI GPT-3 API, Salesforce API, Oracle API, Office 365 API, Automation, Text Classification
Web Scraper
2023 - 2023
FTI Consulting
- Designed and implemented the scraper using Scrapy and PlayWright to scrape music/art events on different websites.
- Parsed and extracted HTML, XML, JSON, and CSV content using pandas and openpyxl.
- Set up an auto-scaling mechanism for auto scraping, daily jobs, and heavy background tasks.
Technologies: Web Scraping, Scraping, Data Scraping, Algorithms, Python 3, Scrapy, Playwright, Selenium, Data Processing, Data Pipelines, Pandas, JSON, XML, Parsers, XML Parsing, HTML Parsing, CSV
Web Scraping Expert
2023 - 2023
Benjamin Kolber
- Scraped news websites to collect author, title, created-date, publication, and main content using Scrapy, Newspaper3k, Playwright, Selenium, and Beautiful Soup.
- Designed a scraping system with error notification, accuracy check, auto-retry, and auto-scaling on demand using Celery, Celery beat, Redis, and Django.
- Implemented RESTful APIs for mobile apps to consume. Some APIs are asynchronous using Django async support.
- Designed the database schema to adapt to new changes from the application and newly requested features.
- Integrated with OpenAI- ChatGPT to get text summary.
- Built a Chrome/Firefox extension to collect URL content and extract and send extracted data to the back-end API.
- Integrated with Slack to send notification messages regarding the bot's performance.
Technologies: Web Scraping, Scraping, Python, Node.js, Scrapy, Selenium, Playwright, Beautiful Soup, Django, REST APIs, PostgreSQL, OpenAI GPT-3 API, OpenAI GPT-4 API, Chrome Extensions, Firefox Extensions, HTML Parsing, XML Parsing, Document Parsing, Slack, Slackbot
Web Scraping Developer
2023 - 2023
Perfect Cube, LLC
- Scraped thousands of LinkedIn profiles and latest posts using Python, Playwright, and IP proxy.
- Integrated with Coda to get and update data using the Python/Coda package.
- Set up, deployed, and automatically scaled the scrapers based on API requests.
- Set up a Flask application with Celery tasks to perform scraper and RESTFUL APIs to receive requests from Coda.
- Designed the database schema and optimized queries using New Relic service and query-inspector packages.
Technologies: Python, Web Scraping, HTML, CSS, JavaScript, Scrapy, Selenium, Playwright, Amazon CloudFront CDN, Beautiful Soup, Data Extraction, Google API, Amazon S3 (AWS S3), Coda, LinkedIn API
Web Scraping Expert
2023 - 2023
Pixelcut Inc.
- Designed a scraper system to scale up and down using Celery and Redis as task queue and task management.
- Deployed the scraper application to a server and configured all processes with supervisorctl.
- Scraped many eCommerce sites (Zara, Zalando, Farfetch, Nordstrom, H&M, Net-a-Porter Madewell, PrettyLittleThing, Unplash) to collect data for AI model processing. The data includes product color, price, and images by Playwright, Scrapy, and Requests.
- Scraped and uploaded images to an S3 bucket and matched uploaded images with image links for each product.
- Optimized the scrapers, e.g., memory leak due to huge load from some Playwright pages, IP blocking, and JavaScript rendering required.
- Refactored and cleaned up code and configured pre-commit.
Technologies: Scrapy, Python, Beautiful Soup, Web Scraping, Playwright, Python 3, CSV, JSON, Amazon S3 (AWS S3), Virtualenv, Pyenv, Selenium, Google API
Senior Django Developer
2023 - 2023
Endeverus Inc.
- Designed and implemented the post feature where students and SME companies can post messages on a project and user dashboard.
- Designed and implemented the comment feature where students and SME companies can comment on a project and user post.
- Built RESTFUL APIs for users using JWT tokens as authentication methods with a custom payload.
- Worked directly with the CEO and CTO to discuss project features' requirements and deadlines, estimate their cost, and plan the milestones and deadlines.
- Integrated back-end APIs with a front-end UI/UX using JavaScript and jQuery.
- Upgraded the front end from pure JavaScript to Vue and refactored the codebase.
Technologies: Django, CSS, JavaScript, Web Development, HTML, Twilio, Amazon S3 (AWS S3), Amazon EC2, Amazon RDS, REST APIs, Docker, Containerization, Docker Compose, Vue, PostgreSQL, Celery, Redis, Redis Cache, Front-end Development
Web Scraping Developer
2023 - 2023
Research Team in Hanoi National University
- Scraped job portal sites, such as jobs.statushp.com, careers.mercy.net, sorbs.net, ema.us, jobs.mayoclinic.org, and others to collect job information and save it to the PostgreSQL database.
- Built a background tasks system with Celery + Redis to run scraper processes.
- Designed and implemented notification systems with Slack to inform the team about the scraper performance, including the number of scraped jobs in an hour, 404 pages.
- Planned daily/weekly tasks for myself and two other developers so we could move forward easier.
- Optimized the scraper to make it more accurate and faster without harming the site performance or violating scraper ethics.
- Customized Django Admin to make it more UI/UX friendly, easy to use, and extract data.
Technologies: Python 3, Python, Scrapy, Requests, Playwright, Selenium, PostgreSQL
Back-end Developer
2023 - 2023
Keyturn Inc
- Designed and developed the subscriptions feature for the application that allows customers to subscribe and make requests.
- Integrated with Stripe subscription and built a webhook to listen to Stripe events, transactions, and activities.
- Architected the database schema for new features and optimized queries on PostgreSQL.
- Analyzed and enhanced the application performance using Sentry and New Relic and used cache to speed up static queries.
- Built RESTful APIs for subscriptions, memberships, and credit management.
Technologies: Back-end, APIs, Integration, Scraping, Web Scraping, Python, Full-stack, Architecture, RESTful Development, REST APIs, Pytest, Unit Testing, Stripe, Stripe API, API Integration, Cloud Deployment, System Architecture, Web Servers
AI Model Developer
2022 - 2023
Japan Celestials.net
- Designed and built AI models to detect human age and gender using a small camera and a small CPU machine (1 GB Ram and 1 CPU) using JavaScript, TensorFlow, and a simple UI interface.
- Optimized, tested, and fine-tuned the models to adapt to different test cases, experimented with different scenarios, and noises.
- Deployed, cleaned, designed, and architected due to different hardware restrictions: small CPU computation, small RAM, and low-resolution camera.
Technologies: JavaScript, Python 3, Python, React, TensorFlow
Full-stack Django and Python Developer
2022 - 2023
Test4me LLC
- Designed and implemented a complete web application using Django for the back and front end to manage the education test system.
- Maintained the old web app and upgraded its features and performance with the help of New Relic for performance and Sentry for error notifications.
- Implemented many Celery tasks to perform background tasks to calculate student test results, analyze student performance, and notify teachers.
- Designed and implemented the student/teacher dashboards using AdminLTE.
- Developed and optimized database queries to improve the performance of the application.
- Integrated with OpenAI to recommend better resources for students with bad test results.
Technologies: Django, Python, HTML, CSS, JavaScript, jQuery, PostgreSQL, Databases, Business Technology, Celery, Redis, Web UI, API Integration, Web Servers, System Architecture, ChatGPT, OpenAI, ChatGPT API, Bootstrap, Front-end Development
Senior Python Back-end Engineer
2022 - 2023
Rapyuta Robotics Co., Ltd.
- Designed the database for warehouse management, robot moving, and shipment tracking information for a robotics firm using PostGIS.
- Created the microsystem with many microservices and how they communicate with a common authentication service. Different services use different tech stacks to cope with the requirements.
- Implemented hundreds of RESTful APIs with high performance to allow microservices to communicate quickly and easily, with or without authentication.
- Documented APIs using Python/Sphinx and Swagger that were maintained and updated daily.
- Wrote performance tests and optimized the APIs and functionalities. The more complicated the service is, the more stress/performance tests we need.
- Wrote unit and integration tests with greater than or equal to 90% code test coverage using Pytest and Django unit tests.
- Built and implemented a simple authentication service using FastAPI and Asyncio.
- Planned sprints and discussed and estimated effort and time for each task. Cleaned the backlog every week.
- Monitored application performance, suggested improvements, and optimized slow queries and transactions.
Technologies: Python, Django, Pytest, Celery, RabbitMQ, Redis, APIs, REST APIs, Docker, FastAPI, Databases, Business Technology, Web Architecture, Web Development, Docker Compose, Containerization, PostGIS, PostgreSQL, SQLAlchemy, Flask, Unit Testing
Full-stack Django Developer
2021 - 2023
Learning Seeds
- Acted as a Django developer to debug and enhance educator workflow tools; investigated the slow queries and bottlenecks of the application, then optimized and improved them. As a result, the system is 100 times faster.
- Integrated with 3rd-party services to collect data, including Amazon S3, Google API, and Loom.
- Designed and applied Django best practices and libraries to improve the source code quality and application performance.
- Implemented RESTful APIs for different resources with multiple levels of permission and JWT authentication.
- Integrated with Slack API to push notifications when the web application models/resources change and reports are generated.
- Created unit tests and integration tests with pytest, sped up the test time, and then went back to optimize the source code again.
- Researched and evaluated new service integrations to add more features to the current application.
Technologies: Django, Python, Social Impact, Full-stack, Django CMS, APIs, Server-side PDF Generation, REST APIs, React, Databases, Business Technology, Redis, Django REST Framework, PostgreSQL, QuerySet API, Sentry, New Relic, APM, Web Architecture, Web Development, JSON Web Tokens (JWT), Cloud Deployment, API Integration, Web Servers, System Architecture, Front-end Development
Django Back-end Developer
2021 - 2022
ELMLAB Sdn. Bhd.
- Designed and implemented dynamic form generation using the Django framework, helping organization managers to create different forms with input and output and a workflow for other members to fill and report.
- Implemented, documented, and optimized RESTful APIs for front-end consumption.
- Created and implemented a report notification feature via Slack API to report errors and employee performances.
- Conducted integration with the email service SendGrid to send emails with proper templates when there is a workflow completion.
- Wrote unit tests to cover all functions and views, wrote stress tests to analyze the application performance, and refactored the code to optimize.
- Followed the best practices recommended by the Django community, books, and experienced developers.
Technologies: Python, Django, AWS Lambda, Django-rest-auth, Celery, Django ORM, Django-taggit, Django Channels, Django-allauth, Databases, Business Technology, Django REST Framework, Redis, Multitenancy
Django and Python Developer
2021 - 2021
DSX Pty Ltd
- Maintained a sophisticated back-end system with thousands of background tasks using Django, Celery, and RabbitMQ.
- Designed and implemented fast and reliable RESTful APIs for candle charts in coin trading and documented the APIs using Sphinx.
- Enhanced the Django admin pages with additional user interface elements, animations, and data visualization tools to make the user experience more intuitive and engaging.
- Created comprehensive unit and integration tests to ensure the highest levels of code test coverage, exceeding 90%. Ensured all existing source code was covered by tests and verified that all code behaved as expected.
- Improved the logic for the hedge trade daily between multiple coin trading systems.
- Stayed up to date with best practices and library updates.
- Designed and optimized the Candlestick Chart APIs using many mechanisms, including temporary report tables, concurrent queries, and smart data selection.
Technologies: Django, Python, Docker, Celery, Databases, Business Technology, Redis, Django REST Framework, Django ORM, Django-taggit, APM, Sentry, PostgreSQL, Architecture, Web Architecture, Web Development, QuickBooks API, QuickBooks Online, Blockchain, Crypto, Trading Bots, Trading
Python and Django Back-end Developer
2021 - 2021
EQTBLE
- Built the project from scratch, designed and applied Django best practices and libraries, including DRF, Celery, and Django extensions, unit tests, integration tests, coverage, clean code, fat models, thin views, and utility functions.
- Implemented RESTful APIs for different resources and models with complicated logic and validations.
- Extended Django OAuth to cope with new project requirements.
- Integrated multiple 3rd-party APIs to process recruitment statistics data.
- Created comprehensive unit and integration tests to ensure the highest levels of code test coverage, exceeding 90%. Ensured that all existing source code was covered by tests and verified that all code behaved as expected.
- Designed and implemented reliable and secure data storage solutions for various applications utilizing PostgreSQL on the AWS Relational Database Service (RDS).
- Added pre-commit with a security check, style check, and unit-test run.
Technologies: Python, Python 3, Django, Django REST Framework, Celery, Redis, Amazon Web Services (AWS), Boto 3, OAuth 2, REST, REST APIs, Databases, Business Technology, PostgreSQL, Data Processing, Data Processing Automation
Senior Full-stack Developer
2020 - 2021
DSTax
- Created and executed an efficient application deployment process on DigitalOcean utilizing the Gunicorn web server, the supervisorctl process control system, and the Git version control system.
- Designed and built RESTful APIs for tax clients, whitelisted and blacklisted IPs, and throttled requests.
- Debugged issues with performance, conducted stress tests, analyzed performance issues, and devised a plan and solution for coding and design.
- Integrated third-party APIs and services, including ONESOURCE, QuickBooks, Shopify, Fishbowl, Acumatica, Vertex, Stripe, and Sovos.
- Built an alert system for customer service, including Slack notifications, Sentry notifications for the development team, and performance notifications for the development and business teams.
- Customized the UI/UX pages for clients and company admins using jQuery, Bootstrap, HTML, and CSS.
- Integrated with QuickBooks APIs, ONESOURCE APIs, Vertex APIs, Stripe, and Chargebee APIs.
- Created QuickBooks Desktop integration to calculate tax on invoice creation/update.
Technologies: Python 3, Python, Flask, Flask-RESTful, Django, Django REST Framework, Celery, RabbitMQ, Intuit QuickBooks, Shopify, Selenium WebDriver, REST APIs, SQLAlchemy, Databases, Business Technology, PostgreSQL, MySQL, System Architecture, API Integration, Cloud Deployment, DigitalOcean, Web Servers, Vertex, OneSource, Sovos, Magento, WordPress, Chrome Extensions, Django ORM, CSS, JavaScript, HTML, jQuery, XML, Acumatica, QuickBooks Desktop, QuickBooks Online, QuickBooks API, Stripe API, Front-end Development
Technical Leader
2016 - 2021
STLPro
- Designed and implemented a scraper system that collects product information from suppliers and lists them in the Amazon store; used Scrapy, Selenium, and Playwright technologies.
- Built thousands of background tasks using Celery and Redis to sync the Django application with the Amazon store for orders and products, using Amazon MWS API and Selling Partner API (SP API).
- Customized and enhanced the UI/UX of the staff dashboard to manage the store using jQuery, Bootstrap, HTML, and CSS.
- Designed the database for store management, product history, and Amazon API requests and responses.
- Optimized the APIs and functionalities by writing unit, performance, stress, and integration tests using Django unit tests and pytest.
- Implemented RESTful APIs for different resources with multiple levels of permission using the Django REST framework and Django filter.
- Integrated with Slack API for notification messages.
Technologies: Amazon, Amazon EC2, Amazon S3 (AWS S3), DigitalOcean, Django, Scrapy, Selenium, Web Scraping, Playwright, Pytest, Celery, Redis, Databases, Business Technology, Background Jobs, Unit Testing, Test Automation, Back-end, Data Scraping, Requests, Amazon API, Amazon Marketplace, eCommerce, Data Processing, Slack, Slack API, XML, Front-end Development
Python Engineer
2020 - 2020
HealthLab
- Built RESTful APIs for the local development team to get workers' information.
- Designed the database schema for new features, making it easy to upgrade and maintain.
- Optimized the system performance due to a massive load of queries using paging, analyzing performance metrics, and cleaning the code.
- Refactored the code, cleaned up messy code and libraries, and upgraded the app engine machines.
- Updated the UI/UX for the web portal using HTML, CSS, JavaScript, and jQuery.
Technologies: Django, Python, Google API, Google Cloud, Jupiter, Databases, Business Technology, Pandas, NumPy, PostgreSQL
Python Expert Developer
2020 - 2020
Sikoia
- Designed and built a web application using Python and Django, Celery, and RabbitMQ from scratch.
- Created unit and integration tests for the current library functions and classes, mainly in data analysis.
- Analyzed data based on the current algorithm and added more filters and complex logic to clean output.
- Worked closely with the owner, who was also the data analysis researcher, to finalize the expected output and identify patterns.
- Deployed the web application in Azure architecture using DevOps and Visual Studio deployment.
Technologies: Data Analysis, NumPy, Pandas, Azure DevOps, Azure Cosmos DB, Django, Python 3, REST APIs, Databases, Business Technology, CSV, CSV File Processing
Python and Django Engineer
2019 - 2019
ARTA
- Designed and implemented RESTful APIs on top of Django, DRF, Celery, and RabbitMQ.
- Designed microservices and their APIs interface and maintained multiple libraries across all services.
- Customized the Django admin features, integrated with Google Geolocation APIs.
- Created thousands of unit and integration tests using Django unit tests to cover at least 90% of the source code.
- Improved and refactored the codebase to make it more efficient using Query Inspect and New Relic.
- Designed the database schema, created indexes, and optimized database settings.
- Refactored the code following the best practices from the Django community, blog, and the book "Django Two Scoops."
Technologies: Django REST Framework, PostgreSQL, Celery, Django, Python, REST, REST APIs, Databases, Business Technology, Background Jobs, Redis, Microservices, RabbitMQ
Back-end Developer
2018 - 2019
Rasoul Holdings, LLC
- Implemented RESTful APIs using Django and DRF to be consumed by mobile applications that use JWT for authentication.
- Involved in designing and deploying the application structure in AWS using Lambda for deployment.
- Integrated Sentry, New Relic, Thumbnail API, AWS, and Slack with third-party services.
- Implemented a web page for Tudoonow.com using HTML, JavaScript, and CSS with fancy UI/UX and animation.
- Customized a Django admin dashboard using Django Grappelli and added many filters, actions, and charts.
- Composed unit and integration tests to cover 90% of the codebase.
- Wrote performance stress tests to detect the bottleneck of the application.
- Refactored code daily to improve performance based on best practices recommended by the Django community and the book "Django Two Scoops."
Technologies: Amazon Web Services (AWS), CSS, JavaScript, HTML, Redis, PostgreSQL, Celery, Django, Python, REST, REST APIs, Databases, Business Technology, GIS, Django REST Framework
Django Developer
2018 - 2019
Atomic One CC
- Built an exquisite UI/UX website and RESTful API based on Python, Django, DRF, Celery, and RabbitMQ.
- Deployed a Docker container to host a web application using Nginx as a web server, RabbitMQ for message brokering, and Gunicorn to serve the application.
- Created an administrative dashboard with Material Design styling and the powerful Django admin framework.
- Implemented soft deletion and history of changes for all objects using Django.
- Integrated AWS, Sentry, Rollbar, engageSpark, SendGrid and NewRelic.
- Created and executed hundreds of automated unit and integration tests to ensure the quality and accuracy of software functionality.
- Refactored code daily to improve performance based on the best practices recommended by the Django community and the book "Django Two Scoops."
Technologies: HTML, CSS, JavaScript, PostgreSQL, Celery, Django, Python, REST, REST APIs, Databases, Business Technology, Front-end Development
Freelance Django Developer
2018 - 2019
Atomic One CC
- Developed a management portal for administrators using the Django admin framework and Material Design for a modern, streamlined look. This portal provides administrators with the tools and resources to manage their organization's data effectively.
- Maintained a SYNC API built entirely in the Python and Django framework while the internet network was down.
- Integrated user-facing elements developed by the front-end developers with server-side logic using jQuery, Ajax, HTML, and CSS.
- Created and maintained unit tests to cover 90% of the codebase, then refactored code following the "Clean Code" book.
- Followed the best practices recommended by the Django community and Django books.
Technologies: Django, Python, REST APIs, Databases, Business Technology, Celery, Redis, APIs, REST, Django REST Framework, Django-taggit, Pandas, NumPy, Docker, Docker Compose
Freelance Full-stack Developer
2016 - 2017
DealzTap
- Designed and optimized a server to meet high-demand requests on AWS EC2 (Dealztap.com).
- Maintained RESTful APIs built entirely with Python, Django, Django REST Framework, and RabbitMQ/Celery.
- Integrated many third-party services, including ONTRAPORT and Google OAuth 2.0.
- Researched and collaborated with the business team to develop the best solution for technical and commercial issues.
- Designed and implemented the database on AWS RDS to cope with new features.
- Built a push notification management system using Firebase.
- Refactored the code daily to improve performance based on the best practices recommended by the Django community and the book "Django Two Scoops."
- Involved in the analysis and design of the application features.
Technologies: Amazon Web Services (AWS), OAuth, Heroku, Django, Python, REST, REST APIs, Databases, Business Technology
Full-stack Developer
2016 - 2016
The Lori System
- Created and maintained a website for transportation quotes in Kenya for trucks only for Lorisystems.com using the Django framework, HTML, CSS, and jQuery.
- Assisted in the successful deployment of an application to both Heroku and the Google App Engine, ensuring a smooth transition from development to production.
- Built RESTful APIs entirely with the Django REST framework powered by Celery and RabbitMQ.
- Created an automated tracking system utilizing the Google Geolocation API to provide real-time location data.
- Researched and built a seamless integration of third-party services, including a secure payment service (PesaPal) and tracking with Google Geolocation API, making it easier to manage payments and track shipments in real time.
- Created a testing automation service inside the project to test, including Style Guide PEP8 (Flake8), API (unit test, Factory Boy), code coverage (coverage.py), and property-based tests (hypothesis).
- Followed the best practices from the Django community, blog, and the book "Django Two Scoops" to refactor the code.
- Created a comprehensive database structure and application infrastructure to ensure efficient data storage and processing.
Technologies: Django REST Framework, Google App Engine, Heroku, jQuery, Django, Python, REST, REST APIs, Databases, Business Technology, Redis, Celery
Back-end Developer
2014 - 2016
StoryTree
- Developed and maintained a RESTful API built entirely in Python with Django, Django Rest Framework, Celery, and RabbitMQ.
- Deployed and maintained an application on an Amazon EC2 server using version control with Git and automation with Fabric.
- Created and deployed PostgreSQL databases on AWS Relational Database Service (AWS RDS) to store and manage data.
- Optimized the application performance to meet users' demands using Nginx for the EC2 server and Heroku apps for free workers.
- Integrated various third-party APIs such as tracking for USPS, FedEx, UPS, logging (Sentry), server performance (New Relic), push notification (Parse), advertising analytics (Fiksu, Tune, Facebook, AdWords), Payment (Stripe), and email (SendGrid).
- Integrated user-facing elements developed by the front-end developers with server-side logic using jQuery, Ajax, HTML, and CSS.
- Built an alert system for customer service using Slack notifications and integration and for project managers using SendGrid email.
- Constructed an AB testing system to test new features based on metrics like the chi-square test and the two-sample test.
- Maintained side projects related to the SimplePrints app using the Node.js framework, Ember.js, and Express.js.
- Customized the Django admin interface by adding extra filters, actions, UI/UX, jQuery DataTable, and Chart.js.
Technologies: Amazon Web Services (AWS), RESTful Development, Redis, Django, Python, REST, REST APIs, Databases, Business Technology, RabbitMQ, Celery, Workers, Background Jobs
Experience
Education System Enhancement
https://www.learningseeds.com/A web application for educators to record student learning experience and engagement, and then to suggest better teaching methodologies and tips for co-workers and teachers. This system has a few roles, including admin, educator, and guest, with different permissions and views.
Recapp
Recapp is an application that allows users to save and read later. The app scrapes the URL information (text, images, videos), summarizes it, then presents it nicely on the app/web. This application is available on mobile applications and web browsers (as an extension).
Education Application for Students
https://adaptivex.io/An innovative and adaptive education application for students and teachers. This app allows teachers to create questions and tests for students. The students will then do tests in different ways thanks to the adaptive algorithm to make all test questions unique.
Education
2012 - 2014
Master's Degree in Computer Science
University of New South Wales - Sydney, Australia
2006 - 2010
Bachelor's Degree in Computer Science
University of Engineering and Technology, Hanoi National University - Hanoi, Vietnam
Skills
Libraries/APIs
Facebook API, Google API, TensorFlow, REST APIs, Requests, Node.js, jQuery, Stripe API, Gmail API, Google Maps API, Selenium WebDriver, Playwright, Twilio API, Pandas, NumPy, Flask-RESTful, React, Django ORM, Django-taggit, Django-allauth, SQLAlchemy, QuerySet API, QuickBooks API, Stripe, Amazon API, Beautiful Soup, Slack API, Salesforce API, Oracle API, Office 365 API, Vue, Puppeteer, Chart.js, D3.js, Amazon EC2 API, LinkedIn API, Google Sheets API, Shopify API, BigCommerce API, Clio API
Tools
Celery, RabbitMQ, Git, GitLab CI/CD, Zapier, Sublime Text 3, Boto 3, GIS, Pytest, Sentry, Docker Compose, Virtualenv, Pyenv, Slack, Acumatica, ChatGPT, Microsoft AI, GitHub, Amazon CloudFront CDN, Coda, Amazon Textract, Google Sheets, Make (formerly Integromat), SendGrid, Mailchimp, Claude, Claude Code, Codex, AWS Glue, Amazon QuickSight, Matomo
Languages
SQL, JavaScript, Python, Python 3, CSS, HTML, PHP, Java, XML, TypeScript, Google Apps Script, HTML5, CSS3
Frameworks
Django REST Framework, Django, Scrapy, Selenium, Ember.js, Express.js, GeoDjango, AngularJS, Flask, OAuth 2, Django Channels, JSON Web Tokens (JWT), Bootstrap, Angular, Angular 6, Redux, Laravel, LangGraph, Next.js
Paradigms
Unit Testing, RESTful Development, Agile Software Development, Functional Programming, Clean Code, Design Patterns, REST, Automated Testing, Test-driven Development (TDD), DevOps, Azure DevOps, Test Automation, Microservices, Web Architecture, Automation
Platforms
Amazon Web Services (AWS), Amazon EC2, Heroku, Linux, Docker, Twilio, OS X, Google App Engine, AWS Lambda, Shopify, Django CMS, Amazon, DigitalOcean, New Relic, Web, Sovos, Magento, WordPress, MacOS, Azure, Salesforce, Google Cloud Platform (GCP), Google Cloud Engine, Blockchain, BigCommerce, Google Ads, Airbyte
Storage
MySQL, PostgreSQL, Databases, JSON, Redis, Azure Cosmos DB, Amazon S3 (AWS S3), Google Cloud, PostGIS, Redis Cache, Cloud Deployment, XML Parsing, Data Pipelines, Cache
Other
Freelancing, Data Science, Data Analysis, Full-stack, Software Development, Front-end Development, Web Scraping, CSV, Software Architecture, Integration Testing, Unix Shell Scripting, Web Services, Scraping, Financials, Business Technology, ChatGPT Prompts, OAuth, Chrome Extensions, Firefox Extensions, Jupiter, Intuit QuickBooks, Coin, Physics, Social Impact, APIs, Server-side PDF Generation, Django-rest-auth, FastAPI, Workers, Background Jobs, Web UI, APM, Recommendation Systems, Symphony, Algorithms, Back-end, Data Scraping, Web Development, Architecture, Integration, QuickBooks Online, CSV File Processing, OpenAI GPT-4 API, OpenAI GPT-3 API, Amazon RDS, Amazon Marketplace, eCommerce, Data Processing, Data Processing Automation, API Integration, System Architecture, Web Servers, Vertex, OneSource, PDF Scraping, Newspapers, HTML Parsing, Document Parsing, Multitenancy, Containerization, Slackbot, Parsers, Text Classification, Amazon FBA, Sunbiz, LexisNexis, Full-stack Development, CI/CD Pipelines, OpenAI, ChatGPT API, Vite, Data Extraction, Scrapyd, Web Crawlers, Newsfeeds, News, MERN Stack, Data Analytics, Optical Character Recognition (OCR), Lottery, Website Data Scraping, Financial APIs, Financial Data, Stock Market, Offshore Team Management, Ticket Systems, Crypto, Trading Bots, Trading, Data Engineering, Artificial Intelligence (AI), Email Automation, Strapi, Gemini, Gemini API, QuickBooks Desktop, LangChain, AWS Database Management System, Amazon Bedrock AgentCore, Cursor AI, ClickUp, Reports, Railway, LLM Agents, Large Language Models (LLMs), Data Privacy, Multi-agent Systems
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