Xavier Coromina
Applied ZK Cryptography Engineer ZisK Associate Professor University Of Girona
Girona, Catalonia, Spain
Summary
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Rockstar🎓
Top SchoolXavier Coromina is an applied ZK cryptography engineer and associate professor based in Girona with over a decade of engineering and academic experience and four years focused on cryptography and blockchain. He blends hands-on systems and embedded background—having founded hardware/software startups and built end-to-end IoT platforms—with recent roles improving zkSNARK tooling and performance at projects like iden3/snarkjs and Polygon Hermez zkEVM. At ZisK and the University of Girona he bridges research and production, optimizing plonkSetup and plonk16Prove pipelines and fixing subtle polynomial and blinding bugs that improved real-world proving performance. Comfortable from low-level C/C++ firmware to Node.js and WASM, he brings a rare combination of product-minded engineering, academic rigor, and startup founder instinct.
4 years of coding experience
19 years of employment as a software developer
UPC Universitat Politècnica de CatalunyaIT PhD courses, IT PhD courses at Universitat de Girona
Catalan, Spanish, English, French
Github Skills (11)
zksnark10
javascript10
performance-optimization10
data-structure9
algorithm9
data-structures9
algorithms9
cli8
wasm-pack8
rust-wasm8
rust5
Programming languages (6)
Github contributions (5)
iden3/snarkjs
May 2022 - Jan 2023
zkSNARK implementation in JavaScript & WASM
Role in this project:
Back-end Developer & Performance Engineer
Back-end Developer & Performance EngineerContributions:9 reviews, 208 commits, 25 PRs in 8 months
Contributions summary:Xavier primarily focused on improving the performance of the `snarkjs` library, specifically within the `plonkSetup` and `plonk16Prove` functionalities. They optimized constraint processing and fixed a bug related to splitting `t(x)` polynomials, adding blinding scalars to address the issue. Furthermore, the user contributed to refactoring and commenting on code to improve readability. The user also added a new command to the CLI to obtain info from files.
javascriptblockchainwebassemblyzksnarkwasm
0xPolygonHermez/zisk
Oct 2024 - Apr 2025
Contributions:1 release, 30 reviews, 97 PRs in 5 months
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