John Hill

Principal SDET / Quality Engineering lead — Playwright, performance, accessibility, and CI at scale. Playwright Ambassador.

Featured work

• NASA Open MCT — 152 commits, 162 merged PRs, 313 issues filed, and 592 PR reviews on NASA's open source mission control framework (2021–2024). Authored and led its e2e testing strategy (e2e/README.md), launched via the Open e2e Testing Initiative: Playwright suites with coverage, sharding, visual, performance, and accessibility checks in CI.
• Playwright — contributor since 2022. Most recently diagnosed and fixed trace-viewer request-timing gaps upstream (#42172, #42173, #42191).
• Publication and talks — Open e2e Testing Initiative with Open MCT (NASA NTRS, TestIstanbul 2022); hands-on tutorial at STARWEST 2022; Testμ 2022; Performance Testing with Playwright.
• openmct-yamcs coverage campaign (2026) — a self-directed e2e and unit coverage effort: 40+ PRs including regression tests for previously closed defects and a websocket subscription leak fix, with adversarially verified results.
• Headlamp (CNCF) — 5 merged PRs in 2026: desktop e2e suite fixes and WCAG accessibility improvements.

What I do

UI and API test automation (Playwright/TypeScript), performance testing (k6, CDP, Performance API), accessibility audits and a11y-in-CI, flake hunting and test-suite stabilization, and CI quality gates — plus test-infrastructure tooling at the QA × AI intersection (grafana/mcp-k6, agy-companion).

Contact

Open to Principal SDET / QA Architect roles · LinkedIn · Blog