edge

Stay sharp as a senior engineer: hard multiple-choice questions on spaced repetition, with short lessons. JS/TS, browser, React, system design, DSA, AI engineering, Go, Rails and staff-level skills. Invite-only accounts, installable on your phone as a web app.

• Lessons: a pretest (try first), then dense concept cards and questions, 5 to 8 minutes.
• Questions are the flashcards: scheduled with FSRS (ts-fsrs). Think of the answer, show the options, say how sure you are: wrong = Again, right but unsure = Hard, right and sure = Good. Sure-but-wrong answers come back first. Each review shows another variant.
• Checked content: every claim cites a spec or official docs with a quote, and pnpm content:check runs every "what does this log" snippet against its answer.

Plan: docs/plan.md. Content standard: data/README.md.

Develop

pnpm install
pnpm content:check      # validate data/, run snippets, write src/lib/content-index.ts
pnpm test
pnpm dev

Stack: Next 16, Postgres (Neon) with drizzle, Better Auth (email + password, ALLOWED_EMAILS), Tailwind 4, biome, vitest with PGlite. Engine copied from vo2.