Hennadii Stepanov (@hhebasto) has been contributing to Bitcoin Core since 2018 and became the project's GUI maintainer in 2021. Brink began funding him in 2021. During 2025, he left over 1,800 review comments and continued his extraordinarily wide-ranging work across the build system, platform support, GUI, translations, CI infrastructure, and libsecp256k1…
Two major Bitcoin Core releases (v29 and v30) shipped in 2025 as the first to use the CMake build system that Hennadii spent years helping to develop, and both went extremely smoothly.
Beyond the main Bitcoin Core repository, Hennadii contributed to libsecp256k1, libmultiprocess, the Bitcoin Core packaging repository, and the maintainer tools repository. He also stepped in to maintain the bitcoin-core and libsecp256k1 packages in the Guix package manager, and contributed upstream fixes and improvements to Boost, Cap'n Proto, Libevent, and Qt.
On behalf of our sponsors, Brink is pleased to continue funding Hennadii's work on Bitcoin Core's build infrastructure and platform support.
Hennadii plans to contribute more significantly to libsecp256k1 review, leveraging the cryptographic skills he developed at Crypto Camp. He'll continue maintaining the build system with a focus on improving the performance of Guix-based release builds (targeting up to a 20% speedup), transitioning Windows release binaries to the UCRT runtime, enabling native Windows builds with Clang, updating Qt 6 to the latest version, and expanding IWYU (Include What You Use) checks across the codebase.
You can view all of his Bitcoin Core PRs here:
And review comments:
More from Bitcoin Core developers funded by Brink:
https://brink.dev/blog/2026/03/26/engineering-impact-report-2025/
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