Marcelo Trylesinski
Senior Software Engineer at Pydantic
Utrecht, Utrecht, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolMarcelo Trylesinski is a Senior Software Engineer with 11 years of experience, currently at Pydantic and based in Utrecht, Netherlands. He is a core maintainer of Starlette and Uvicorn and a recognized FastAPI expert, contributing to the foundations of modern Python async web tooling. His open-source work spans high-impact projects like FastAPI, httpx, Celery, and Pants, where he improves type safety, test coverage, and CI/DevOps workflows. Marcelo combines deep backend engineering—microservices, async servers, and observability—with practical experience shipping libraries used broadly in production. He also brings a background in coordinating teams and translating product specs into scalable technical designs, and has a knack for uncovering subtle compatibility and typing issues across ecosystems.
11 years of coding experience
4 years of employment as a software developer
University of São Paulo
Portuguese, Spanish, Italian, English
Stackoverflow
674reputation
66kreached
17answers
1question
fastapi
top-5%
Github Skills (84)
dependency-management10
fastapi10
python10
testing10
http10
websocket10
instrumentation10
generic-programming10
asgi10
pydantic10
async10
ruff10
mypy10
validation10
agent-framework10
Programming languages (21)
Github contributions (5)
Kludex/awesome-fastapi-projects
Jul 2020 - Oct 2022
List of FastAPI projects! :sunglasses: :rocket:
Role in this project:
Back-end Developer
Back-end DeveloperContributions:3 reviews, 20 commits, 16 PRs in 2 years 3 months
Contributions summary:Marcelo primarily focused on building a FastAPI project listing tool, automating the process of gathering and presenting information about FastAPI projects. Their contributions include developing scripts to search for projects on GitHub, extract dependencies, and generate a markdown table summarizing project dependencies. Additionally, the user implemented scripts for cloning repositories, deduplicating links, and basic file manipulation, demonstrating a strong understanding of project automation and data extraction.
fastapi
encode/broadcaster
Aug 2022 - Dec 2022
Broadcast channels for async web apps. 📢
Role in this project:Back-end Developer
Back-end DeveloperContributions:21 reviews, 12 commits, 38 PRs in 4 months
Contributions summary:Marcelo primarily contributed to the back-end functionality of the `broadcaster` project. Their work involved removing unnecessary asynchronous calls, updating dependencies, and adding new features like Redis password support. They also addressed compatibility issues by supporting Python 3.10 and refactoring code to remove deprecated parameters, indicating an understanding of the project's core technologies and its dependencies on external libraries. They also worked on the Kafka backend specifically, and contributed to type hinting.
asyncbroadcast-channel
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