Matthew Leon
Software Engineer
around the world, United States
Summary
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SeniorMatt Leon is a software engineer with 12 years of technical experience and 19+ years of leadership in high-stakes, multi-stakeholder environments, including a Secret DoD clearance. He combines hands-on backend development—contributing to notable open-source projects like PureScript, bitcoinj, and BigInteger.js—with program and project management, policy analysis, and data management skills. His open-source work emphasizes compiler/tooling improvements, crypto-safe refactors, and test-driven quality enhancements, reflecting a focus on robustness and maintainability. Experienced coordinating joint military, NGO, and government partners for stabilization operations, he brings rare operational discipline to software delivery. Based in Cambridge, MA, he also has financial services and large-scale recruiting experience, having enlisted over 500 service members. Colleagues would call him a pragmatic problem-solver who translates complex, competing priorities into reliable technical outcomes.
12 years of coding experience
Github Skills (36)
algorithm10
algorithms10
crypto-wallet10
wallet10
javascript10
testng10
bitcoin-wallet10
jes10
testing10
purescript10
key-management10
bitcoin10
bitcoins10
data-structure10
java10
Programming languages (17)
Github contributions (5)
purescript/purescript
Jan 2017 - Jan 2020
A strongly-typed language that compiles to JavaScript
Role in this project:
Backend Developer
Backend DeveloperContributions:14 commits, 29 PRs, 183 comments in 2 years 11 months
Contributions summary:Matthew contributed to the PureScript compiler and related tools. Their work involved refactoring and optimizing code within the codebase, specifically focusing on improving the efficiency of the compiler and eliminating redundant code. The user also worked on improving the tooling, adding features and fixing bugs in the documentation generation. A significant portion of their work involved code related to do notation, error handling, and tag generation.
javascriptstrongly-typedhaskellpurescripttyped-language
bitcoinj/bitcoinj
Apr 2018 - May 2019
A library for working with Bitcoin
Role in this project:Back-end Developer
Back-end DeveloperContributions:52 commits, 65 PRs, 70 comments in 1 year
Contributions summary:Matthew primarily focused on maintaining and refactoring the `bitcoinj` library, a Java-based project for working with Bitcoin. They made numerous changes addressing code deprecation warnings and potential vulnerabilities, notably migrating from the deprecated `AESFastEngine` to `AESEngine`. Their contributions include fixing potential `NullPointerExceptions`, updating outdated JavaDoc references, and improving the robustness of the codebase by addressing non-canonical signature issues and simplifying error checking. Furthermore, the user enhanced various core classes related to wallet encryption, key management, and transaction handling.
bitcoinjavablockchainbech32segwit
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