Level up.Land the job.Get promoted.Skip the noise.
My mission
Empower 1,000 engineers to get promoted or land their dream job.
Mike Guoynes. Frontend lead, ex-LaunchDarkly
Frontend lead writing for mid/senior frontend devs who want to ship better systems, interview with confidence, and stop plateauing.
Featured this month
Course· Module I open now
Stop overthinking UI state.
For engineers who want to avoid useEffect antipatterns and learn the way to cleanly organize production-grade state without over-thinking it.
- ✦10+ modules · mental models and applied lessons
- ✦Virtualization, React 19 features, Next.js
- ✦Design & build a social news feed from the ground up
Preview Module I for free →$100 early-bird · one-time fee
Performance16 min read
Virtualization vs. Infinite Scroll, and How to Build Them
Three fixes for one slow feed. Not the same fix. The three-layer model, plus a virtualized list built from scratch in plain React.
Read the lesson →
What you'll actually learn