Jack Grigg
Engineer at Electric Coin Company
United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolJack Grigg is a seasoned engineer with 14 years of experience building high-assurance systems, currently contributing to the reference Zcash implementation and wallet at Electric Coin Company. He brings deep expertise in cryptography and low-level systems, with notable open-source contributions to Bitcoin Core, zk-SNARK libraries (bellman, halo2), BLS12-381 and multiple Rust cryptography projects. His work spans mobile and backend domains—from adding privacy-aware proxy support to an Android browser and improving Python 2/3 compatibility to implementing constant-time elliptic-curve arithmetic and hardening ECDSA parsers. Jack pairs rigorous academic training in physics and applied physics (MSc with distinction, PhD studies) with pragmatic engineering, often improving security through tests, refactors, and careful parsing fixes. Colleagues describe him as a quietly prolific contributor who prefers fixing subtle correctness and performance issues that others might miss.
14 years of coding experience
1 year of employment as a software developer
Bachelor of Science (BSc), Physics, Chemistry, Mathematics, Bachelor of Science (BSc), Physics, Chemistry, Mathematics at University of CanterburyDoctor of Philosophy (Ph.D.), Engineering Physics/Applied Physics, Doctor of Philosophy (Ph.D.), Engineering Physics/Applied Physics at Lincoln University (NZ)
Spanish
Stackoverflow
586reputation
26kreached
5answers
2questions
Github Skills (69)
ec10
python10
testing10
proxy10
bitcoins10
proxy-pac10
cryptocurrency10
javas10
f10
build-automation10
i18n-js10
fluentd10
p2p10
elliptic-curve-cryptography10
ecdsa10
Programming languages (29)
Github contributions (5)
zkcrypto/bls12_381
Dec 2019 - Dec 2022
Implementation of the BLS12-381 pairing-friendly elliptic curve group
Role in this project:
Back-end Developer
Back-end DeveloperContributions:48 reviews, 65 commits, 60 PRs in 3 years
Contributions summary:Jack primarily focused on implementing and improving the `bls12_381` pairing-friendly elliptic curve group implementation. Their contributions involved refactoring code to improve readability, fixing ambiguous operation warnings, removing unnecessary references, and implementing and improving group operations. They also added support for pairing traits and implemented tests, ensuring the correctness and performance of the cryptographic primitives.
elliptic-curve
zkcrypto/bellman
Jul 2018 - Jul 2022
zk-SNARK library.
Role in this project:Backend Developer
Backend DeveloperContributions:30 reviews, 166 commits, 45 PRs in 4 years
Contributions summary:Jack contributed to the `zkcrypto/bellman` repository, a zk-SNARK library. Their commits focused on integrating the `ff` and `group` crates for field and curve trait implementations within the project's core functionalities, particularly in multiexp and Groth16-related files. They also addressed clippy warnings and other code style issues, and replaced Engine with PrimeField in bellman core.
circomsnarksnarkjs
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