Roman Leshchinskiy
Software Engineer at Jane Street
London, England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolRoman Leshchinskiy is a software engineer with 8+ years of industry experience and a deep research background in compilers, high-performance programming and distributed systems. He has driven large-scale engineering at Meta—where he started and led Glean, a notable source-code indexing system—and now works on low-latency infrastructure at Jane Street. His career spans academia and finance, from compiler optimizations and Data Parallel Haskell research to building schedulers, distributed pricing systems and high-performance GUIs in production. Known for hands-on backend improvements (e.g., optimizing Glean’s bytecode generation and dispatch), he blends formal academic rigor with pragmatic engineering to squeeze performance out of complex systems. Based in London, he pairs a Dr. rer. nat. in Computer Science with a proven track record of turning compiler and language research into production-grade code.
8 years of coding experience
17 years of employment as a software developer
Dipl.-Inf., Computer Science, Dipl.-Inf., Computer Science at Technische Universität Berlin
English, Russian, German
Github Skills (6)
c-language10
cprogramming-language10
bytecode10
codegen10
system-design8
haskell7
Programming languages (5)
Github contributions (5)
facebookincubator/Glean
Mar 2021 - Oct 2022
System for collecting, deriving and working with facts about source code.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:9 reviews, 67 commits, 33 PRs in 1 year 7 months
Contributions summary:Roman primarily focused on improving the Glean bytecode generation system. They removed unused code, optimized switch-based dispatch, and unified calls to typechecker subroutines. They also made various refactoring changes, including storing function results via pointers and modifying how subroutines are suspended. The user's work resulted in more efficient code execution.
collectingderivingfacts
rleshchinskiy/dune
May 2023 - May 2024
A composable build system for OCaml.
Contributions:61 pushes, 12 branches in 1 year
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