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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

3679 commits, 506 PRs, and 183 issues across 34 repositories.

Aug 2025 — Aug 2026
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(nvim): add sudo-edit under <leader>fu1d
JP-Ellis/dotfilesfeat(nvim): add doom-style file operations under <leader>f1d
JP-Ellis/dotfilesfeat(mise): adopt six CLI tools from Homebrew1d
JP-Ellis/dotfileschore(mise): pin every tool to an exact version1d
JP-Ellis/dotfilesfeat(syncthing): add ignore rules for ~/src3d
JP-Ellis/dotfilesfix(syncthing): use a valid dotter target type4d

Latest issues & PRs

JP-Ellis/dotfiles[PR · merged]
feat(nvim): reconcile <leader>f with Doom's SPC f1d
JP-Ellis/dotfiles[PR · merged]
feat(mise): pin exact versions and adopt six tools from Homebrew1d
JP-Ellis/dotfiles[PR · merged]
docs(claude): trim global instructions1d
JP-Ellis/dotfiles[PR · merged]
feat(nvim): update LazyVim plugins during system update3d
Selected 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
rust-skiplistOSS · librarySkiplist data structure implementation in Rust.↗ github
↗ All projects