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Hello, again

I codify contracts between systems for a living, in Rust and Python. I once spent five years chasing where the antimatter went.

Senior software engineer at PactFlow (SmartBear). I help lead the open-source Pact Foundation and maintainpact-python; I also wrote tikz-feynman,rust-skiplist, and more.

Previously: data and cloud engineering at KPMG, and doctoral research in theoretical particle physics.

The year in code

5151 commits, 806 PRs, and 276 issues across 37 repositories.

Oct 2025 — Oct 2026
Most of what I make is open. Each square below is one day of my GitHub contributions over the past year.

Latest commits

pact-foundation/pact-referencechore(pact_verifier_cli): release v1.4.05h
pact-foundation/pact-referencechore(pact_verifier): release v1.5.06h
pact-foundation/pact-referencechore(pact_consumer): release v1.4.117h
pact-foundation/pact-pythontest(ffi): measure coverage in subprocess tests9h
pact-foundation/pact-pythontest: import testcontainers only when starting a broker9h
pact-foundation/pact-referencechore(pact_matching): release v2.1.010h

Latest issues & PRs

JP-Ellis/rust-skiplist[PR · open]
fix: make ordered collections sound under bad comparators9h
pact-foundation/pact-python[PR · merged]
feat(ffi): support free-threaded Python 3.15 with abi3t wheels9h
pact-foundation/pact-python[PR · merged]
Docs/logging blog post10h
pact-foundation/pact-reference[PR · merged]
fix(ci): tighten the release linkage check14h

Selected projects

pact-pythonOSS · libraryPython bindings for Pact, rebuilt over a Rust FFI core. Downloaded over 1.3 million times a month.↗ github
tikz-feynmanOSS · LaTeXA LaTeX package for typesetting Feynman diagrams with TikZ; adopted across particle physics with 400+ academic citations.↗ github
rust-skiplistOSS · libraryA skip list for Rust.↗ github
↗ All projects