Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

I am a Python backend developer specializing in building and optimizing backend applications with Django and Django REST Framework. I design REST APIs, data processing pipelines, and automation tools, and I enjoy turning complex requirements into robust, scalable services. I have hands-on experience with Playwright-based web scraping, containerization with Docker, and writing tests to ensure production-grade code. I value clear communication, continuous learning, and collaborating with English-speaking teams.…I am a Python backend developer specializing in building and optimizing backend applications with Django and Django REST Framework. I design REST APIs, data processing pipelines, and automation tools, and I enjoy turning complex requirements into robust, scalable services. I have hands-on experience with Playwright-based web scraping, containerization with Docker, and writing tests to ensure production-grade code. I value clear communication, continuous learning, and collaborating with English-speaking teams.

Marcin Grzechnik

Web Developer, Back-End Developer, Full Stack Developer, +2





I am a Python backend developer specializing in building and optimizing backend applications with Django and Django REST Framework. I design REST APIs, data processing pipelines, and automation tools, and I enjoy turning complex requirements into robust, scalable services. I have hands-on experience with Playwright-based web scraping, containerization with Docker, and writing tests to ensure production-grade code. I value clear communication, continuous learning, and collaborating with English-speaking teams.…I am a Python backend developer specializing in building and optimizing backend applications with Django and Django REST Framework. I design REST APIs, data processing pipelines, and automation tools, and I enjoy turning complex requirements into robust, scalable services. I have hands-on experience with Playwright-based web scraping, containerization with Docker, and writing tests to ensure production-grade code. I value clear communication, continuous learning, and collaborating with English-speaking teams.

Available to hire

I am a Python backend developer specializing in building and optimizing backend applications with Django and Django REST Framework. I design REST APIs, data processing pipelines, and automation tools, and I enjoy turning complex requirements into robust, scalable services.

I have hands-on experience with Playwright-based web scraping, containerization with Docker, and writing tests to ensure production-grade code. I value clear communication, continuous learning, and collaborating with English-speaking teams.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

Polish

Fluent

English

Advanced

Work Experience

PR Writer (AI Code Reviewer) at Revelo

January 1, 2026 - Present

Analyzed and evaluated the quality of AI-generated Python code for logical correctness, readability, and engineering best practices. Verified code behavior by running unit and integration tests and analyzing the results. Identified bugs, edge cases, and performance issues in backend code. Provided detailed code-review-style feedback (pros/cons, recommended changes). Worked with Git repositories and Docker environments (configuration, debugging, running projects). Assessed production readiness of submitted code.

AI Safety Evaluator at TELUS AI

January 1, 2026 - Present

Evaluated the quality of AI model responses (including Python code) against detailed guidelines. Analyzed logical correctness, consistency, and safety of model outputs. Processed and annotated data to improve AI model quality (data labeling and annotation).

Python Developer at 7j7.pl (startup — online services platform)

July 1, 2024 - January 1, 2025

Developed backend services in Django REST Framework with PostgreSQL integration. Designed and implemented REST APIs (data validation, pagination, filtering, JWT authorization). Optimized SQL and ORM queries (select_related, prefetch_related) — reducing database response time by ~30%. Implemented unit and integration tests (pytest) — reducing bugs in the test environment by 25%. Built a web scraping module with Playwright and BeautifulSoup; normalized and persisted data to PostgreSQL. Contributed to the Airport API project — endpoint design, data serialization, integration with external sources. Refactored backend code to improve readability and architectural modularity.