Mateusz Kwapich
Software Engineer at Facebook
England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolMateusz Kwapich is a seasoned software engineer with 13 years of experience, currently working at Facebook out of the UK and specializing in backend systems and source control infrastructure. He has a track record of contributing to large-scale developer tooling—most notably improving Facebook's sapling source control with bug fixes, histedit compatibility, skiplists rebuilding, and ancestor-finding logic. His background includes internships at Amazon and early web development roles, giving him end-to-end perspective from product-facing code to core infrastructure. A University of Warsaw computer science alumnus who pursued graduate studies, he combines strong academic grounding with pragmatic engineering at scale. Colleagues can expect a steady problem-solver who focuses on robustness and developer ergonomics in complex codebases.
13 years of coding experience
3 years of employment as a software developer
Bachelor’s Degree, Computer Science, Bachelor’s Degree, Computer Science at University of Warsaw
Github Skills (17)
version-control10
mercurial10
rust10
performance-optimization8
scripting7
python-scripts7
pyscript7
script7
python7
database6
sql-database6
sql6
databases6
tsql6
system-design5
Programming languages (5)
Github contributions (5)
facebook/sapling
Oct 2014 - Jan 2023
A Scalable, User-Friendly Source Control System.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:656 commits, 3 PRs, 2 pushes in 8 years 4 months
Contributions summary:Mateusz primarily worked on improving and maintaining the `sapling` source control system. Their contributions focused on fixing bugs related to xdiff behavior with empty files, enhancing the histedit tool for compatibility with mutation and visibility, and adding functionalities like the ability to rebuild skiplists. The commits also involved the addition of methods for identifying common ancestors and the implementation of a mechanism to reverse-fill and manage repository configurations, indicating work across core code and infrastructure.
control-systemscalablesource-controluser-friendly
mitrandir77/AdventOfCode2022
Dec 2022 - Dec 2022
Contributions:41 commits, 36 pushes, 4 branches in 23 days
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