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
3547 commits, 496 PRs, and 173 issues across 34 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
JP-Ellis/dotfilesfeat(claude): add severity and effort scoring20h
JP-Ellis/borrow-checkerfix(csv): guard named columns beyond every row21h
JP-Ellis/borrow-checkerdocs(beancount): name every import error cause21h
JP-Ellis/dotfilesdocs(claude): add global prose rules23h
JP-Ellis/jpellis.mefix(stats): log fallback use on SSR pages1d
JP-Ellis/jpellis.mefix(stats): single-flight and back off refreshes1d
Latest issues & PRs
JP-Ellis/borrow-checker[PR · open]
feat(bc-core): metadata events6hJP-Ellis/borrow-checker[PR · open]
feat(bc-core): metadata key registry and coercion6hJP-Ellis/borrow-checker[PR · open]
feat(bc-core): persist typed metadata6hJP-Ellis/borrow-checker[PR · open]
feat(bc-models): typed key-value metadata types6hSelected 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