Pieter Wuille
Engineer at Chaincode Labs
San Francisco Bay Area United States
Summary
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Top expert inCryptocurrency Systems Development
Pieter Wuille is a software engineer with 14 years of experience, currently a Bitcoin developer at Chaincode Labs and formerly at Blockstream, based in Belgium. He’s known for deep, low-level work on Bitcoin Core and the broader crypto ecosystem—implementing Schnorr and Taproot support, Bech32m, and efficient cryptographic primitives such as an in-code ChaCha20 variant. Pieter specializes in back-end systems engineering: UTXO and mempool architecture, serialization, and performance optimizations across many high-profile projects (bitcoin/bitcoin, bitcoin-abc, Bitcoin Unlimited, Litecoin, Zcash and more). His contributions routinely combine rigorous cryptography with pragmatic engineering—writing test vectors, integrating libsecp256k1, and reducing dependencies to make protocol changes auditable and production-ready. He also shows domain and language versatility, contributing beyond crypto to projects like FLIF and adding multi-language reference implementations for BitcoinArmory.
15 years of coding experience
12 years of employment as a software developer
Master of Engineering - MEng, Computer Science, Master of Engineering - MEng, Computer Science at KU LeuvenBasisschool Boven-LoMathematics & Science, Mathematics & Science at Sint-Albertuscollege Haasrode
English, Dutch, French
Stackoverflow
101reputation
0reached
0answers
0questions
Github Skills (75)
crypto-wallet10
transaction10
serializable10
python10
datastructure10
testing10
bitcoins10
c1110
refactorings10
datastructures10
c1710
cryptocurrency10
deserialization10
low-level-programming10
dns10
Programming languages (21)
Github contributions (5)
sipa/bitcoin-seeder
Dec 2011 - Jan 2022
Role in this project:
Back-end Developer
Back-end DeveloperContributions:9 reviews, 121 commits, 35 PRs in 10 years 2 months
Contributions summary:Pieter primarily worked on improving the DNS functionality of the bitcoin-seeder repository. Their contributions include implementing features to handle DNS requests, writing and modifying code related to parsing and writing DNS records, and adding support for A and AAAA records. They also integrated a database to store and manage IP addresses, making the seeder more robust. These changes enhance the project's ability to function as a DNS seed for bitcoin-like networks.
bitcoinxt/bitcoinxt
Apr 2015 - May 2018
Bitcoin XT. Most recent release is K.
Role in this project:Back-end Developer
Back-end DeveloperContributions:108 commits in 3 years 1 month
Contributions summary:Pieter primarily focused on refactoring and optimizing the codebase. Their commits involved reducing the default number of blocks to check, making the `ProcessNewBlock` function `const`, and streamlining the reindexing process. The user also introduced improvements to the mempool, including supporting `-checkmempool=N` to check transactions and addressing potential integer overflows, showcasing their focus on improving system stability and performance. Additionally, the user worked on improving memory usage.
bitcoin-xtbitcoin
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