Devajith S
Software Engineer (Compiler) at CERN
Meyrin, Geneva, Switzerland
Summary
🤩
Rockstar🎓
Top SchoolDevajith S is a compiler-focused software engineer with nine years of experience, currently contributing to CERN’s Cling C++ interpreter used by the widely adopted ROOT data-analysis framework. He specializes in modernizing C++ codebases, upstreaming fixes across LLVM/Clang, and extending interactive execution to heterogeneous targets (SYCL for CPU/GPU/RISC-V). His open-source track record includes MLIR work at Huawei and an LLVM Foundation GSoC project that added a REPL-style query tool for MLIR, as well as performance and modern C++ refactors in the ROOT cling component. Based in Meyrin, Geneva, he combines systems-level C/C++ expertise with practical delivery experience from industry projects and kernel contributions, and is known for reducing downstream patches by pushing fixes upstream.
8 years of coding experience
2 years of employment as a software developer
Master's degree, Computing, Master's degree, Computing at Cardiff University / Prifysgol CaerdyddBachelor of Technology - BTech, Chemical Engineering, Bachelor of Technology - BTech, Chemical Engineering at Indian Institute of Technology Hyderabad
English, Hindi, Malayalam, French
Github Skills (8)
c-language10
cprogramming-language10
interpreter10
llvm10
cplus9
cpp9
debug8
debugging8
Programming languages (8)
Github contributions (5)
root-project/root
Dec 2023 - Apr 2025
The official repository for ROOT: analyzing, storing and visualizing big data, scientifically
Role in this project:
Back-end Developer
Back-end DeveloperContributions:35 reviews, 63 PRs, 21 pushes in 1 year 3 months
Contributions summary:Devajith primarily focused on back-end development, specifically within the "cling" component of the ROOT project. Their contributions revolved around refactoring and adapting the "cling" interpreter to use more modern C++ features. The user replaced `llvm::Optional` and other LLVM-specific classes with their standard equivalents, updated the codebase to use deduction guides, and implemented value printing for C++20 features like `std::source_location` and `std::filesystem::path`. They also made modifications to improve the performance and maintainability of the "cling" interpreter, including moving parts of the parsing logic and updating the pass manager.
pythonroot-cernmathematicsc-plus-plusscientific-visualization
devajithvs/llvm-project-cil
Apr 2023 - Apr 2023
Generates CIL MLIR dialect from C/C++ source.
Contributions:23 pushes, 1 branch in 1 day
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