Lukasz is available for hire
Hire LukaszLukasz Jaworowski
Verified Expert in Engineering
Python 3 Developer
Warsaw, Poland
Toptal member since April 10, 2020
Bio
Lukasz is a senior freelance software engineer and tech lead with deep expertise in Python and back-end systems. He's successfully led engineering teams, scaled startup products, and delivered high-impact corporate platforms. With hands-on experience across Python, Go, PySpark, AWS, and modern DevOps tooling, he specializes in architecting and optimizing high-performance, data-driven solutions. Clients value Lukasz for his ability to combine technical depth, leadership, and execution at scale.
Portfolio
NetAutomate
Amazon, Ansible AWX, Ansible, Terraform, Kubernetes, Helm, Django, Python 3...
NDA
Python 3, Artificial Intelligence (AI), Data Engineering, JavaScript...
Qredo
Go, Python 3, Amazon, MongoDB, PostgreSQL, APIs, Back-end, Kubernetes...
Experience
- Python 3 - 10 years
- REST - 9 years
- Django - 8 years
- Amazon Web Services (AWS) - 7 years
- ETL - 6 years
- Scrapy - 4 years
- Celery - 4 years
- Go - 3 years
Preferred Environment
Go, Python, Kubernetes, Terraform, Ansible, ETL, Agentic AI, Claude, ChatGPT
The most amazing...
...project I led was the development of an Amazon campaign management platform, managing more than $250 million in advertising spend across 500+ global brands.
Work Experience
Developer | DevOps
2023 - PRESENT
NetAutomate
- Developed a network automation application using Python and Django to support network engineering operations.
- Automated network engineering scenarios using Python and Ansible Automation Platform (AAP), including automation of applications such as BIG-IP and other network services.
- Developed a Terraform provider for the company's product network automation application.
- Designed and implemented custom Backstage plugins to extend functionality and improve developer experience for the company’s main product.
- Investigated and resolved performance issues in a legacy Django and Celery application used to manage client networking device information and setup.
- Designed and implemented an IaC solution to automatically construct, provision, and configure BIG-IP devices.
Technologies: Amazon, Ansible AWX, Ansible, Terraform, Kubernetes, Helm, Django, Python 3, Claude, Agentic AI, Amazon OpenSearch, Elasticsearch, Artificial Intelligence (AI), Data Engineering, JavaScript, API Integration, Search, Architecture, Data Pipelines
Developer
2024 - 2025
NDA
- Prepared visual datasets for AI models, ensuring data quality and usability.
- Standardized data formats and schemas to enable consistent and scalable model training.
- Developed custom Python scripts for processing visual data from multiple sources.
Technologies: Python 3, Artificial Intelligence (AI), Data Engineering, JavaScript, API Integration, Search, Architecture, Data Pipelines
Technical Lead
2021 - 2023
Qredo
- Created an application for the exchange of compliance-related data among Virtual Asset Service Providers (VASPs) using Python, FastAPI and Matrix (matrix.org).
- Built compliance-related microservices in Go, including a tainted asset scanner, Web3 data reporting, and on-ramp providers.
- Engaged in improving code quality and testability, maintaining a test coverage rate exceeding 70% across repositories.
- Conducted quarterly performance reviews within the team as a tech lead.
Technologies: Go, Python 3, Amazon, MongoDB, PostgreSQL, APIs, Back-end, Kubernetes, Data Engineering, API Integration, Search, Architecture
Python Developer
2020 - 2021
Global eCommerce and Retail Media Advertising Agency
- Built a new version of an app using FastAPI for a top eCommerce company that managed over USD 250M of ad spends. The application allows enterprise clients to manage online campaigns in marketplaces like Amazon.
- Developed authentication and user management module using AWS Cognito. Later, during development, changed it to PostgreSQL DB-based authentication. Provided features like MFA using Twilio and CLI tool for basic operations using 'click' library.
- Created Lambda functions to handle campaigns automation and asynchronous report generation using Python, Chalice and AWS SAM.
- Worked directly with the CTO and Product Owner to design solutions leveraging available AWS Services support scaling up the application designed to use a multi-account AWS environment.
- Developed a set of endpoints based on Amazon Advertising API for various campaign management operations.
- Created a set of endpoints for dashboards and graphs from various sources such as external APIs, Elasticsearch, PostgreSQL.
- Provided unit, integration and E2E tests using pytest and Testcontainers.
- Delivered application logging, captured important user events and developed middlewares for detailed logging.
- Collaborated closely with front-end team and shared new back-end versions on a daily basis using internal Docker repositories.
- Worked as the main Python developer in a project. Cooperated with two other Python developers on data-related and deployment tasks and three people on front-end. Collaborated on a project for nine months and delivered a beta version to first users.
Technologies: Python, FastAPI, SQL, Elasticsearch, Amazon CloudWatch, Docker, Pytest, AWS Lambda, Stripe API, REST, REST APIs, Amazon Cognito, Lambda Architecture, Twilio, MySQL, PostgreSQL, Asyncio, APIs, Back-end, JavaScript, API Integration, Search, Architecture
AWS/Python Developer
2020 - 2021
Freelance (Three Month Project for Startup in the Education Sector)
- Developed Lambdas in Python to extract data from PDF files using Apache Tika, PyMuPDF, PDF2text, and more.
- Created API in Django REST framework for data management with custom filters using Elasticsearch on AWS.
- Built front end in Vue with Amplify and integrated it with the Django REST framework back end.
- Managed app deployment, hosting on AWS using Elastic Beanstalk, Chalice, Amplify, and Amazon Cognito.
- Established an AWS environment comprising VPC networking, Elasticsearch service, Elastic Beanstalk, Route53, S3, Lambda, and Amazon Cognito.
Technologies: Amazon Web Services (AWS), Pandas, Django REST Framework, Amazon Cognito, Django, Tika, AWS Lambda, Data Extraction, Python 3, Vue, MySQL, PostgreSQL, Scraping, Vue 2, Amazon Simple Queue Service (SQS), APIs, Back-end, Data Engineering, API Integration, Search, Architecture, Data Pipelines
Python Developer
2019 - 2020
GFT Technologies
- Designed a GraphQL API for a leading European fintech company using Python, Django, and Graphene.
- Discovered and fixed performance issues related to Celery and database operations. Built user notification modules.
- Developed PySpark ETL jobs for one of the largest financial institutions.
- Set up a project from scratch, from repository creation to Git hooks, CI/CD, and deployment.
- Created a REST API for managing datasets, developed using Python and FastAPI.
- Supported application deployment to Pivotal Cloud Foundry.
- Created unit and integration tests for PySpark ETL jobs and the FastAPI application.
- Conducted cross-team Python learning sessions for a group of 50 - 100 developers and analysts. Topics included core Python, clean code, and Git webhooks.
Technologies: Amazon Web Services (AWS), Pandas, Django REST Framework, Python 3, Spark, PCF, Linux, Jenkins, PySpark, Docker, GraphQL, Django, Python, Python 2, MySQL, PostgreSQL, ETL, Asyncio, Scraping, Amazon Simple Queue Service (SQS), APIs, Back-end, Apache Kafka, Data Analytics, Data Science, Data Analysis, Data Engineering, API Integration, Architecture, Data Pipelines
Python Developer
2018 - 2019
Appriss
- Developed a Django app integrated with the Jira platform to support the development of the web scraping software.
- Developed ETL scripts to process complex incarceration data.
- Migrated ETL scripts from AWS Lambda functions to on-premise Rancher + Docker environment.
- Created over 150 web scraping spiders in Scrapy (Python).
- Developed unit and integration tests. Performed code reviews.
- Created data dashboards in Dash (Python) to present web scraping results statistics.
- Migrated data from external PDF, Excel, and Docx files to on-premise systems.
Technologies: Amazon Web Services (AWS), Pandas, Django REST Framework, Python 3, Docker, SQL, Scrapy, Django, Python, Python 2, MySQL, PostgreSQL, ETL, Asyncio, Scraping, Amazon Simple Queue Service (SQS), APIs, Back-end, Data Engineering, API Integration, Data Pipelines
Python Developer
2015 - 2018
Vacancysoft
- Developed a core web scraping system to gather data about the latest job offers in Europe.
- Replaced a third-party web scraping and data processing software with Python applications.
- Automated various operations processes in Python, Celery, and Django. Moved existing Linux scripts to a more maintainable Python environment.
- Introduced CI/CD to automatically deploy Celery applications.
- Developed extract transform load (ETL) pipelines in Celery and RabbitMQ.
- Provided in-house training to junior developers on topics like ETL, Python, and SQL.
- Built a job title classifier in Python and the Natural Language Toolkit (NLTK) library.
Technologies: Amazon Web Services (AWS), Pandas, Django REST Framework, Python 3, Celery, RabbitMQ, Selenium, Scrapy, Django, Python, Python 2, MySQL, Scraping, APIs, Back-end, Data Engineering, API Integration, Data Pipelines
Developer
2017 - 2017
DreamLab
- Developed web applications for one of the biggest media groups in Poland.
- Prepared data migration scripts for articles data stored on Solr.
- Developed web app components in jQT, Less, and Node.js.
Technologies: CSS, HTML, Node.js, PostgreSQL, APIs, Back-end
Experience
Recruitment Platform - Applicant Tracking System - Bachelor's Thesis (2018)
I was responsible for designing the database, specifying project requirements, and developing the back end. The API was written in Python using the Django REST framework and hosted on the AWS stack (EC2 and RDS). Also, two other developers worked on the web/iOS clients for this API.
The application provided the following functionalities:
Recruiters were able to:
• Add the company's profiles
• Add jobs to the company's profiles
• Invite other recruiters to the company
• Add jobs to the company
• Describe recruitment steps for a job offer
• Describe recruitment steps templates for various job types
• Move the candidate to the next recruitment step or reject the candidate
• Contact candidates via chat
Candidates were able to:
• See a list of jobs
• Apply to a job
• Create a candidate's profile
• See various dashboards
• See current progress in pending recruitment processes
The application provided the following functionalities:
Recruiters were able to:
• Add the company's profiles
• Add jobs to the company's profiles
• Invite other recruiters to the company
• Add jobs to the company
• Describe recruitment steps for a job offer
• Describe recruitment steps templates for various job types
• Move the candidate to the next recruitment step or reject the candidate
• Contact candidates via chat
Candidates were able to:
• See a list of jobs
• Apply to a job
• Create a candidate's profile
• See various dashboards
• See current progress in pending recruitment processes
Education
2014 - 2018
Bachelor of Science Degree in Computer Science
Polish-Japanese Academy of Information Technology - Warsaw, Poland
2012 - 2014
Bachelor's Degree in Geodesy, Surveying and Cartography
Military University of Technology - Warsaw, Poland
Certifications
DECEMBER 2019 - DECEMBER 2022
Amazon Web Services Solutions Architect - Associate
Amazon Web Services (AWS)
JULY 2019 - JULY 2020
Amazon Web Services Cloud Practitioner
Amazon Web Services (AWS)
Skills
Libraries/APIs
Pandas, React, Node.js, Vue, Tika, Vue 2, PySpark, Asyncio, Stripe API, REST APIs
Tools
Celery, Git, Amazon Simple Queue Service (SQS), Terraform, Ansible, Amazon Cognito, RabbitMQ, Jenkins, Amazon CloudWatch, Pytest, GIS, Helm, AWS IAM, Claude, ChatGPT, Amazon OpenSearch
Languages
Python 3, Python, Python 2, SQL, Go, JavaScript, PCF, HTML, CSS, GraphQL, Java
Frameworks
Django, Scrapy, Django REST Framework, Backstage, Spark, Selenium
Platforms
AWS Lambda, Docker, Linux, Amazon Web Services (AWS), Twilio, Amazon, Kubernetes, Apache Kafka
Storage
Data Pipelines, MySQL, PostgreSQL, Elasticsearch, Databases, NoSQL, MongoDB, PostGIS
Paradigms
ETL, REST, Lambda Architecture
Other
APIs, Scraping, Data Extraction, FastAPI, Back-end, Back-end Development, Web Scraping, Web Crawlers, Data Engineering, API Integration, Search, Architecture, Geodatabases, Ansible AWX, Full-stack, Artificial Intelligence (AI), Data Analytics, Data Science, Data Analysis, Agentic AI
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