Micha Reiser
Member Of Technical Staff at OpenAI
Bern, Bern, Switzerland
Summary
🤩
Rockstar🎓
Top SchoolMicha Reiser is a versatile software engineer with 11 years of experience, currently a Member of Technical Staff at OpenAI after building high-performance Python tooling at Astral and leading parser and pretty-printer work as Tech Lead at Rome. He combines deep language and tooling expertise—evident from substantive contributions to high-profile open-source projects like Ruff, Rome, Biome, and uv—with hands-on backend and frontend skills across Rust, Python, and JS/TS. Micha is strong at debugging and refactoring core parsers and formatters, improving correctness and performance in developer toolchains, and has shipped performance improvements at scale during roles at Meta. A collaborative mentor and cross-functional planner, he pairs technical rigor with care for team well-being and accessible product design. Notably, he often works on the plumbing that makes developer workflows faster and more robust, from f-string formatting edge cases to virtualenv activation across platforms.
11 years of coding experience
18 years of employment as a software developer
Master of Science FHO in Engineering mit Vertiefung in Information and Communication Technologies, Computer Science, Master of Science FHO in Engineering mit Vertiefung in Information and Communication Technologies, Computer Science at HSR Hochschule für Technik Rapperswil
German, English
Stackoverflow
201reputation
15kreached
1answer
3questions
Github Skills (39)
javascript10
parser10
virtual-environment10
python10
uvm10
packaging10
command-line-interface10
typescript10
enforcement10
syntax10
resolver10
code-analysis10
code-generation10
lang10
typescript-types10
Programming languages (14)
Github contributions (5)
astral-sh/ruff
Jan 2023 - Jul 2026
An extremely fast Python linter and code formatter, written in Rust.
Role in this project:
Backend Developer
Backend DeveloperContributions:7682 reviews, 3552 PRs, 5658 pushes in 3 years 6 months
Contributions summary:Micha primarily contributes to the Ruff project as a formatter backend developer, with a focus on enhancing the quality of the code through standardization and correctness. Their work involves modifying the formatting process, as exemplified by their work related to f-string expressions, comments, and various formatting scenarios. They have demonstrated expertise in Python code structure, and formatting design, with a clear understanding of implementing fixes for common code styling issues.
linterpythonrustpep8python3
rome/tools
Aug 2021 - Jan 2023
Unified developer tools for JavaScript, TypeScript, and the web
Role in this project:Back-end Developer
Back-end DeveloperContributions:2562 reviews, 441 commits, 918 PRs in 1 year 5 months
Contributions summary:Micha's contributions primarily focused on refactoring and improving the parser for JavaScript and TypeScript code. The changes involved modifying the grammar to correctly handle various language features and address parsing errors, indicating a strong involvement in the core functionality of the tool. They worked on features such as JSX element names, type arguments, and improved the formatting of expressions. The commits show a dedication to ensuring the correctness and robustness of the parsing process.
javascripttypescriptformatterlintertoolchain
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