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Make Your Web Front-end Reliable with Elm
https://www.toptal.com/developers/front-end/make-web-front-end-reliable-with-elm
Stas is available for hire
Hire StasStas Davydov
Verified Expert in Engineering
Web Developer
Tbilisi, Georgia
Toptal member since April 21, 2015
Bio
Stanislav is a full-stack web development expert with 30+ years of experience. His top areas of expertise include MVP architecture and development; API design, implementation, and integration; data mining, scraping, processing, and pipelines. Stanislav loves to work with people and has contributed to a range of projects and organizations, from universities to enterprises and startups.
Portfolio
The Estee Lauder Companies Inc.
Python, GitHub, Apache Airflow, Google Cloud Platform (GCP), Web Scraping
Go Playfully Inc
Flask, PostgreSQL, APIs, Python, Cloud Firestore, Performance, Scalability...
Pradipkumar Ramanlal
Web Scraping, API Integration, REST APIs, Python, Machine Learning...
Experience
- Java - 20 years
- Minimum Viable Product (MVP) - 15 years
- Python - 13 years
- Django - 12 years
- DevOps - 10 years
- REST APIs - 9 years
- Elm - 5 years
- Kubernetes - 3 years
Work Experience
Python Developer
2024 - PRESENT
The Estee Lauder Companies Inc.
- Implemented data collecting/handling pipelines using Python and Apache Airflow.
- Reviewed code on a daily bases for data engineering team.
- Optimized Docker containers build process and size for Airflow DAGs.
Technologies: Python, GitHub, Apache Airflow, Google Cloud Platform (GCP), Web Scraping
Python Back-end Developer
2024 - 2024
Go Playfully Inc
- Designed a PostgreSQL schema for travel application data previously stored in NoSQL and vector databases.
- Implemented data migration scripts to transfer data from NoSQL and vector databases into PostgreSQL.
- Refactored the existing application back end to align with the new data model.
- Communicated effectively with the team regarding data migration and code refactoring.
Technologies: Flask, PostgreSQL, APIs, Python, Cloud Firestore, Performance, Scalability, Google Cloud Platform (GCP), Google Cloud Functions
API Developer
2024 - 2024
Pradipkumar Ramanlal
- Implemented a web scraper for Wall Street Journal articles with metadata.
- Implemented a web scraper for Financial Times articles and metadata.
- Obtained most of the WSJ and FT articles with metadata.
- Implemented a draft script for ML on the obtained data.
Technologies: Web Scraping, API Integration, REST APIs, Python, Machine Learning, Artificial Intelligence (AI), Natural Language Processing (NLP)
Python Back-end Developer
2024 - 2024
Go Playfully Inc
- Migrated Firestore database into PostgreSQL by refactoring Python API service and data access layer code.
- Implemented several DevOps workflows for continuous database migration with PostgreSQL.
- Migrated Weaviate database into PostgreSQL with Pgvector integration.
- Worked on several projects to integrate PostgreSQL data back end into an existing codebase.
Technologies: Flask, PostgreSQL, APIs, Python, Cloud Firestore, Performance, Scalability, Google Cloud Platform (GCP), Google Cloud Functions, Terraform, DevOps, Docker, FastAPI, Weaviate, Firebase, Google Cloud
Web Scraping Expert
2024 - 2024
Datafabric Pty Ltd
- Implemented an email scraping script with data persistence.
- Implemented multi-level verification of email addresses.
- Analyzed and tested the company's approach to data clearance.
Technologies: Web Scraping, Python, Data Scraping, Website Data Scraping, Beautiful Soup, Playwright
Python and Java Developer
2021 - 2022
RiskFinTech (via Toptal)
- Created a multicore model execution service for stress-testing models in Python.
- Built a stress-testing spec service, specifically Java, Spring Boot, and PostgreSQL.
- Developed CI/CD scripts using GitHub workflow and integrated the full cycle of build and deployment to AWS cloud.
- Designed a distributive model execution service for running stress-testing models.
- Participated in tech design and planning sessions, estimations, and sprints.
- Developed a set of local scripts and documentation for testing and debugging microservices used in stress testing.
Technologies: Python, Asyncio, Pandas, Multiprocessing, Java, Amazon Web Services (AWS), Amazon S3 (AWS S3), Amazon Elastic Container Registry (ECR), Kubernetes, Docker, Amazon RDS, GitHub, GitHub API, REST, REST APIs, DevOps, Spring, PostgreSQL, FastAPI, TypeScript, React, Redux, Redux-Saga, AWS DevOps, Helm, Front-end Development, Back-end Development, APIs, JUnit, HTTP REST, OAuth, OAuth 2, Data Pipelines, Big Data, Full-stack, User Interface (UI), Back-end, Databases, RabbitMQ, Apache Spark, Node.js, Jupyter, Clean Code, Bash, Startups, API Integration, API Design, API Development, Debugging, Troubleshooting, Deployment, Agile, DNS, Technical Writing
Django Developer
2021 - 2021
Octavodia Ltd (via Toptal)
- Reviewed existing code in the context of Django view performance.
- Analyzed SQL code from Django ORM queries and suggested several approaches for performance improvement.
- Refactored some core models to get better performance.
- Applied PostgreSQL full-text search capabilities to improve performance.
Technologies: Python, Django, Django ORM, PostgreSQL, Performance, SQL Performance, Back-end Performance, Back-end, Databases, Clean Code, Debugging, Troubleshooting
Python Developer
2021 - 2021
PokerCentral LLC (via Toptal)
- Analyzed available APIs from PayPal and the App Store to get the required data.
- Implemented service Python class for data retrieval from APIs.
- Created a script for retrieving data and testing on a real merchant account.
Technologies: Python, PayPal, REST APIs, APIs, Integration, Payment APIs, API Integration, Troubleshooting
Python Engineer
2020 - 2021
ipdata (via Toptal)
- Implemented several scripts for scraping, parsing, and normalizing huge data sets (hundreds of gigabytes).
- Used multiprocessing and asyncio features of Python 3.
- Communicated with the client daily and helped find optimal resolutions to requests as they came along.
Technologies: Python, Web Scraping, Asyncio, Data, Multiprocessing, Performance, Big Data, Data Scraping, Scraping, Website Data Scraping, Clean Code, Bash, Debugging, SDKs
Developer
2020 - 2020
Vox Dei, Pte., Ltd. (via Toptal)
- Analyzed and helped fix a PayPal payment API integration issue.
- Reviewed code for my colleagues, primarily in Java.
- Discussed payment workflow issues together with clients.
Technologies: PayPal API, Java, Code Review, Magento Back-end Development, JUnit, Clean Code, API Integration, Debugging, Troubleshooting
Lead Java Developer
2019 - 2019
Megapixel Solutions, LLP
- Developed a payment gateway proxy for the NETS payment system.
- Implemented unit tests for certification acceptance tests.
- Deployed and delivered services with AWS EC2 and a set of deployment scripts.
Technologies: Amazon Web Services (AWS), PostgreSQL, Spring, APIs, JUnit, Back-end, Payment Gateways, API Integration, API Development, Debugging
Lead Developer and Mentor
2019 - 2019
Evermesh Solutions, LLC (via Toptal)
- Designed and implemented a web application for cruise price discounts using Django.
- Recorded screencasts about all steps of development to create learning materials for the client.
- Documented the project's features and functionality.
- Implemented unit tests to cover complex workflows of price change alert signups and notifications and integrated PayPal payments.
Technologies: PayPal, PostgreSQL, JavaScript, Django, Python, Bootstrap, jQuery, Full-stack, Full-stack Development, Front-end, Front-end Development, Back-end Development, Mentorship & Coaching, HTTP REST, User Interface (UI), Back-end, Clean Code, Debugging, Deployment, Agile, DNS, Technical Writing
Python Developer
2018 - 2019
Cabin
- Provided code review, mentoring, and consulting for the company developers.
- Developed integration with 3rd-party APIs for signing documents.
- Implemented Zapier integration for data processing and pipelining.
Technologies: Python, Django, PostgreSQL, Zapier
Lead Python Developer
2018 - 2019
That Green Space, Pte., Ltd.
- Supported and developed improvements for a Singaporean real estate CRM.
- Updated the user interface functionality based on requirements.
- Implemented new business logic, queries, and reports.
Technologies: Amazon Web Services (AWS), PostgreSQL, Django, Python, Back-end Development, Front-end Development, Full-stack Development, HTTP REST, OAuth, Full-stack, User Interface (UI), Back-end
Lead Java Developer
2018 - 2018
Hoolah Co.
- Developed the MVP for an online consumer installments payment system.
- Refactored the database to fit the project requirements.
- Deployed and delivered an API service to AWS EC2. Implemented scripts for automatic service restoring.
- Integrated payments with Shopify using Shopify Payment API.
- Implemented unit tests for the core functionality and API.
Technologies: Amazon Web Services (AWS), PostgreSQL, Microservices, Java, REST APIs, Shopify API, Shopify, JUnit, HTTP REST, Back-end, Databases, Payment Gateways, Clean Code, Startups, API Integration, API Design, API Development, Debugging, Troubleshooting, Deployment, Agile, Technical Writing
Lead Python Developer
2016 - 2018
HUS Unmanned Systems
- Implemented a drone automation management system using Django.
- Implemented a web app for managing drones, drone missions, reports, subscriptions, and more.
- Developed video streaming from drones to subscribers.
- Implemented a wall damage evaluation web app used by construction inspectors.
- Developed the UI for the drone management system app.
Technologies: Amazon Web Services (AWS), PostgreSQL, JavaScript, Django, Python, Asyncio, Django Channels, Redis, Streaming, PostGIS, Geolocation, SVG, jQuery, Front-end, Back-end, HTTP REST, Full-stack, User Experience (UX), User Interface (UI), Databases, Data Visualization, Full-stack Development, Clean Code, Bash, Startups, GIS, Geocoding, API Integration, API Design, API Development, Debugging, Deployment, Agile
Lead Python Developer
2012 - 2015
Adamation, Inc.
- Developed a website for company services promotion.
- Built a webshop for selling goods and services. Also implemented a platform for the shop.
- Created a 3D printing customization webshop. 3D WebGL visualization is used for presenting and customization of 3D models.
- Collaborated with customers and designers in design sessions.
- Designed web app architecture with Django and MySQL as back end, custom HTML and jQuery on front end.
- Maintained a whole AWS infrastructure for the company.
Technologies: Amazon Web Services (AWS), Authorize.net, MySQL, JavaScript, Django, Python, Amazon RDS, Amazon S3 (AWS S3), Amazon CloudFront CDN, 3D Printing, Printing, APIs, Django REST Framework, Ubuntu, Amazon EC2, DevOps, HTTP REST, Cloudflare, Full-stack, User Experience (UX), User Interface (UI), Back-end, Databases, Full-stack Development, Payment Gateways, Clean Code, Bash, Startups, API Integration, API Design, API Development, Debugging, Troubleshooting, Deployment, Technical Leadership, DNS, Email, Technical Writing
Lead Developer
2011 - 2012
Oh My Guide
- Implemented an innovative Android GIS app with image recognition facilities.
- Used the full Android stack from UI to NDK. Developed custom libraries.
- Created the application website with an attractive UI.
- Participated in development during the startup incubator program.
Technologies: MySQL, PHP, Android, Java, Big Data, Mobile App Development, Mobile Development, User Experience (UX), User Interface (UI), Data Scraping, Scraping, Website Data Scraping, Full-stack Development, Clean Code, Startups, GIS, Geocoding, API Integration, Debugging, Troubleshooting, Deployment, Agile, DNS
Web and Informational Design Consultant
2008 - 2012
PR Partner
- Maintained the company's website and services. Updated it on a weekly basis.
- Fixed bugs and added features to the website. Prepared documents for publication.
- Helped company staff to operate with the website and consulted on feature addition.
Technologies: PHP, HTML, CSS, Full-stack, Full-stack Development, htaccess, DNS
Team Lead
2005 - 2007
Exigen Services
- Led and motivated a team of 10 Java developers. Controlled tasks and estimates.
- Implemented complex functionality for a library ERP system.
- Analyzed workflow and implemented functional tests.
- Trained the team to use modern Java tools and approaches.
Technologies: Oracle, Jakarta EE (Java EE or J2EE), Java, JUnit, Spring, Full-stack, Back-end, Databases, Clean Code, Debugging, Technical Leadership, Agile, Leadership, Technical Writing
Customer Support Engineer, Software Engineer, and Build Engineer
2002 - 2004
JetBrains
- Satisfied customers in solving technical questions.
- Implemented intranet web solutions for CRM and sales support.
- Participated in the development of IntelliJ IDEA and related libraries.
- Supported the building and testing environment. Configured and maintained a set of CI/CD scripts.
- Implemented the first revision of the IntelliJ IDEA plugin repository front and back end.
Technologies: CSS, SQL, HTML, Jakarta Server Pages (JSP), Java, Ant Design, DevOps, JUnit, Bash, Debugging, Deployment
Freelance Consultant
2001 - 2004
HotDispatch Community
- Answered customer questions.
- Participated in over 150 problems-solving endeavors.
Technologies: Java, C++, C, htaccess
Java Developer
2002 - 2002
OpenWay Group
- Implemented custom database management software.
Technologies: Oracle, Java, JUnit, Databases, Debugging
Senior Software Engineer
2000 - 2002
AtBusiness Communications
- Worked as a Java project team leader.
- Developed distributed website management system W3Publisher.
- Coordinated development tasks.
Technologies: SQL, Swing, Java, JUnit, User Interface (UI), Databases, Clean Code, Debugging
Software Developer
2000 - 2000
LeviSoft/SPb
- Developed an eCommerce advertisement system for CyberGold, Inc.
Technologies: CSS, HTML, Perl, Sybase, Linux, Solaris, Java, C, Bash, Debugging, Troubleshooting
Software Developer
1999 - 1999
ESNA Technologies, Inc.
- Worked as a system programmer and took part in the “LinX Fax Server” project.
Technologies: Microsoft Access, Windows, C++, C, Debugging
Founder, CEO, PR/HR/Project Manager, and Software Developer
1997 - 1999
DP Group
- Developed a number of projects for private customers and small firms in my first big achievement with management and software development.
Technologies: Forth, Fortran, MATLAB, Delphi, C++, C, Startups, CTO, Leadership
Web Developer
1997 - 1999
Web Studio MAIN
- Contributed to company projects.
Technologies: Perl, JavaScript, CSS, HTML, htaccess, DNS
Programmer
1996 - 1996
Computer Center of the State Marine Technology University
- Developed a security system for a local bookkeeping database.
Technologies: Assembler x86
Project History
Payment Gateway Proxy for the NETS Payment System
I developed a set of API for integrating my client payment gateway with the NETS payment system. I used Spring Boot as a framework for API integration, and for the platform, I created a complete set of REST APIs and unit tests.
Python SDK Scripts for Ipdata
https://ipdata.co/I developed scripts for Python for using ipdata data services, and the ipdata provides REST API for retrieving information by IP address about the company, geolocation, and more.
The Python SDK wraps this API for easy use from Python code. I created custom scripts for better and faster data retrieving using ipdata API.
The Python SDK wraps this API for easy use from Python code. I created custom scripts for better and faster data retrieving using ipdata API.
Cruise Price Discount Web App
It was a complete redesign and rebuild of the existing web app for comparison and selling discounted tickets on cruises across the US. The original app was built more than 10 years ago, and my client wanted to recreate it with modern Django. My role was to reimplement the app and be a mentor for my client in the area of web development. I also screen-casted videos of the performance of work.
Real Estate Management CRM
I've implemented some features and fixed the enterprise-level Django app created for managing real estate stakeholders' data. It contains a spread set of modules for householders, room rentals, repair masters, and more.
Merchant MVP API for Hoolah.co
I implemented an MVP API for Hoolah's merchants, where initially, the client has requested to implement it with AWS Lambda, but then we found it is not fast enough, so I reimplemented it with Rapidoid framework, then it became really fast and reliable, and we have PostgreSQL as a database. I used JDBC directly to access data for better performance.
Drone Automation Management System for H3D
I've implemented a management system for automating drone missions like flying around by geo points, making photos and videos, and more. The system was built as a web app on Django with Django Channels. UI is based on Bootstrap with jQuery. Also, the Django REST framework is used.
Courses for Adult Learning
I was the developer of the Australian educational organization College for Adult Learning, and I was responsible for DevOps tasks, implemented new features, and integrated the site with other systems, by using Django, Python, PostgreSQL, AWS.
My Keepsake eCommerce Platform
A white-label eCommerce platform for selling licensed 3D printed content. I designed and developed the platform with Django. The Authorize.net payment gateway was used to capture credit card payments. The platform's main feature was the 3D visualization of customized 3D content with WebGL.
Nix Model Executor
A microservice intended to run financial models. It was initially implemented with Python and the pandas library, packed as a Docker container, and run in Kubernetes. It is intended for running models during stress-testing simulations.
Around the World
A free Android offline map and POIs application. I developed the app and website using Java, HTML5, JavaScript, PHP, XML, OSM, JNI, and C. Its "wow" feature is image recognition for historical and architectural objects.
Wikinomika
The website for the Russian edition of the book “Wikinomics” by BestBusinessBooks for collaborative editing of translation content. PHP, XML, XSL, CSS. The website is no longer online.
Gold Section
This program helps webmasters (and graphic designers) to find a nice color palette for their websites and other projects. Available as a Win32 application and as a Java application for any platform (could work with IntelliJ IDEA Java IDE). C++, Java, Swing.
Motivate Me Right!
My book about motivation, people, and organizations.
Typography Plugin for WordPress
http://wordpress.org/extend/plugins/wwwartlebedevru-typograph/Does Russian typography for all posted WordPress texts. Used www.artlebedev.ru Typograph web-serivce. PHP, WordPress.
TED Subtitle Extractor
An extraction service for subtitles from famous TED.com videos. PHP, JavaScript, Ajax.
OZON.ru XML-catalogs Parser
A PHP + XSL parser for partners of OZON.ru online store. PHP, XML, XSL, xHTML CSS.
WikiCrowd
https://github.com/stasdavydov/wikicrowdA light useful wiki engine powered by Ajax, PHP, XML, and XSL.
Ozon 2.0
An affiliate of the best online store in .ru. XML, PHP, MySQL, CSS, JavaScript, Ajax.
Olga Bistrova's Website
Personal site of artist Olga Bistrova. PHP, HTML, XML, CSS.
Julia Repina's Website
Personal site of artist and designer Julia Repina. PHP, HTML, AJAX, XML, CSS.
Distributed Model Execution Service
A Python FastAPI-based service intended to manage and run Python models (ML and finance stress testing) in Kubernetes. The models were represented as Python code in numerous GitHub repositories. GitHub is used as the model registry data back end.
Sedna Model Registry
A back end and API based on Java Spring Boot, using PostgreSQL as a registry storage and AWS ECR as a container registry. It was intended to store information about different implementations and versions of financial stress-testing models stored as Docker containers in ECR and available to be run on demand in a Kubernetes cluster.
Specification Service
A Java Spring Boot-based back end and API for stress-testing specifications storage. Used PostgreSQL as a data back end for specifications. Stored complex configuration (specification) with particular stress-testing use cases, running strategies, and documents.
Job Orchestrator Service
A Java Spring Boot-based service for the orchestration of the steps of stress-testing simulation execution. Integrated to run Apache Spark jobs in Kubernetes or a local environment. Provided an API for manipulating simulation jobs. PostgreSQL was used as a data back end.
Email Validation Script
A multi-level email validation and verification tool capable of running in parallel. PostgreSQL was used as the data back end. I utilized Semantic as well as SMTP protocol capabilities to check the validity of emails. It's ML and AI-ready.
Education
2022 - 2023
Beginner to Intermediate Level in Thai Language
Koh Samui Language & Vocational School - Koh Samui, Thailand
1994 - 2000
University Degree in Computer Science
State Marine Technology University - Saint-Petersburg, Russia
Skills
Libraries/APIs
jQuery, Asyncio, Django ORM, REST APIs, JDBC, PayPal API, Django-allauth, API Development, Backbone.js, jQuery UI, Shopify API, Django Compressor, GitHub API, Beautiful Soup, Playwright, Authorize.net, WebGL, Pandas, React, Redux-Saga, SciPy, NumPy, NDK, Matplotlib, OpenAPI, Node.js, SQLAlchemy
Tools
IntelliJ IDEA, PyCharm, Git, Amazon Elastic Container Registry (ECR), GitHub, Jupyter, GIS, Geocoding, Zapier, Microsoft Access, MATLAB, Android NDK, AWS SDK, Amazon CloudFront CDN, Terraform, Helm, Amazon EKS, RabbitMQ, Apache Airflow
Languages
JavaScript, Python, Java, CSS, HTML, SQL, XML/XSLT, XSLT, XSL, C++, C, Bash, PHP, Perl, Delphi, Fortran, Forth, Assembler x86, Elm, Scala, TypeScript
Frameworks
Django, Django Channels, Django REST Framework, JUnit, Swing, Bootstrap 3, Spring, Spring Boot, Vanilla JS, Spark, Jakarta Server Pages (JSP), Android SDK, Spring Core, Bootstrap, Ant Design, Redux, OAuth 2, Apache Spark, Flask, JSON Web Tokens (JWT)
Paradigms
REST, Clean Code, Refactoring, Agile Software Development, Scrum, Agile, Microservices, Unit Testing, DevOps, ETL, Mobile Web Design, Mobile Design, Mobile Development
Platforms
AWS Lambda, Docker, Amazon Web Services (AWS), Unix, Windows, Linux, Jakarta EE (Java EE or J2EE), Oracle, Solaris, Ubuntu, Android, Shopify, Kubernetes, Amazon EC2, Jupyter Notebook, Google Cloud Platform (GCP), Firebase
Storage
MySQL, Amazon S3 (AWS S3), JSON, PostgreSQL, PostGIS, Databases, Sybase, Oracle SQL, Redis, SQL Performance, Data Pipelines, Cloud Firestore, Google Cloud
Other
Web Development, Ajax, APIs, MVP Design, Minimum Viable Product (MVP), Web Scraping, Back-end, FastAPI, Full-stack, API Integration, Full-stack Development, HTTP REST, Data Scraping, Scraping, Website Data Scraping, API Design, Debugging, Troubleshooting, Usability, High-load, PayPal, Shopify Payments, CI/CD Pipelines, OAuth, Big Data, User Experience (UX), User Interface (UI), Data Visualization, Payment Gateways, Deployment, Technical Leadership, htaccess, GoDaddy, Email, Technical Writing, Technical Documentation, SDKs, Proxy Servers, JetBrains IDE, Tools, Load Balancers, UX Analysis, Web UX, Multiprocessing, SVG, Amazon RDS, Search, Amazon API Gateway, Amazon Route 53, 3D, Shipping, 3D Printing, Computer Science, Data, Code Review, Streaming, Geolocation, Front-end, Printing, Jupiter, Thailand, AWS DevOps, Integration, Payment APIs, Front-end Development, Back-end Development, Performance, Back-end Performance, Team Mentoring, Documentation, Architecture, Telemetry, Production, Mail, Delivery, Mobile UX, Java Native Interface (JNI), Magento Back-end Development, Mentorship & Coaching, Cloudflare, Mobile App Development, Startups, Mathematics, Statistics, CTO, Leadership, DNS, Scalability, Google Cloud Functions, Weaviate, Machine Learning, Artificial Intelligence (AI), Natural Language Processing (NLP)
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