Vassil Vassilev
Research Software Engineer at Princeton University
Geneva, Geneva, Switzerland
Summary
🤩
Rockstar🎓
Top SchoolVassil Vassilev is a Research Software Engineer with 17 years of experience in compiler construction, C++ tooling and big data analysis frameworks, currently based in Geneva and working at Princeton University. He holds a PhD in Computer Science and is best known as the author of the C++ interpreter Cling and for sustained contributions to LLVM/Clang, improving attribute printing, module handling and REPL functionality in one of the most influential compiler projects. Vassil combines deep systems expertise (C++, STL, LLVM, Clang, ROOT) with practical engineering—refining build systems, documentation, and robustifying complex compiler subsystems. He has a track record of mentoring students through Google Summer of Code and adapting research-grade tools for production use at institutions like CERN and Fermilab. An understated strength is his attention to developer experience: many of his commits target clearer diagnostics, reproducible builds and easier-to-use REPL/documentation workflows that benefit the wider C++ ecosystem.
17 years of coding experience
7 years of employment as a software developer
SOU Hristo ProdanovUniversity of Plovidiv "Paisii Hilendarski"University of Plovdiv "Paisii Hilendarski"
Bulgarian, English, French
Github Skills (37)
go-modules10
debugging10
debug10
c-language10
clang-cl10
template-metaprogramming10
sphinx10
llvm10
compiler-development10
c-compiler10
kernel-module10
c1110
interpreter10
c1710
automatic-differentiation10
Programming languages (21)
Github contributions (5)
vgvassilev/clad
Feb 2014 - Jan 2023
clad -- automatic differentiation for C/C++
Role in this project:
Back-end Developer
Back-end DeveloperContributions:17 releases, 1461 reviews, 312 commits in 9 years
Contributions summary:Vassil primarily focused on refactoring and renaming components within the "clad" project, an automatic differentiation tool for C/C++. Their contributions involved renaming files and functions (e.g., "autodiff" to "clad") across various source files. They also implemented the addition of a clad external project to the build system. Furthermore, they adapted several tests by renaming or changing the expected outputs related to "clad" and included several new demos.
cppclang-compilerautomatic-differentiationdifferentiationderivative-functions
root-project/cling
Sep 2021 - Jan 2023
The cling C++ interpreter
Role in this project:Backend Developer
Backend DeveloperContributions:16 releases, 1 review, 84 commits in 1 year 4 months
Contributions summary:Vassil primarily worked on improving the documentation system for the Cling C++ interpreter. Their commits focused on enabling the Sphinx documentation system and restructuring the documentation files. They also made several adjustments to the build configuration, including changing the theme, and addressing various build issues, such as fixing pathing and include directives. The commits suggest an effort to enhance the project's documentation and build process.
cppclangc-plus-plusjupytercling
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