Hello, again
I codify contracts between systems for a living, in Rust and Python; and once spent a decade chasing where the antimatter went.
Senior software engineer at PactFlow (SmartBear). Open source contributor to pact-python,tikz-feynman, rust-skiplist, and more.
Previously: data and cloud engineering at KPMG, and a PhD in theoretical particle physics.
The year in code
3972 commits, 547 PRs, and 207 issues across 36 repositories.
Most of what I make is open. The grid below is the truthful version of a résumé — public, dated, and dense in the parts where I was paying attention.
Latest commits
pact-foundation/pact-broker-dockerchore(ci): run prek through its own action1d
pact-foundation/pact-broker-dockerchore: render breaking-change footers in the changelog1d
pact-foundation/pact-broker-dockerchore(ci): check commit messages on pull requests1d
pact-foundation/pact-broker-dockerfeat!: drop the linux/arm/v7 image1d
JP-Ellis/borrow-checkerfix(beancount): skip a transaction with no postings1d
JP-Ellis/borrow-checkerfix(bc-ui): block saving under a cost chip error1d
Latest issues & PRs
pact-foundation/pact-cplusplus[PR · open]
Review follow-ups for the 2026 refresh1dpact-foundation/pact_broker[PR · merged]
test: follow-ups to the pact-ruby v2 migration1dpact-foundation/pact_broker[PR · open]
fix: pass JSON.parse options as keywords for json 31dJP-Ellis/borrow-checker[PR · merged]
docs: describe the transaction row's second line1dSelected projects
pact-pythonOSS · libraryPython bindings for Pact, rebuilt over a Rust FFI core. The version most pact-python users actually reach for.↗ github
tikz-feynmanOSS · LaTeXA LaTeX package for typesetting Feynman diagrams with TikZ; adopted across particle physics with 400+ academic citations.↗ github
↗ All projectsRecent writing