What is DevSprint?
DevSprint is an arcade-style JavaScript quiz that tests the topics commonly asked in technical interviews. Built as a portfolio feature on flabs.tech, it's a fast, tense sprint through 20 questions — 20 seconds each, 3 lives, streak multipliers.
How it works
- 20 of 44 questions sampled per run from a bank covering closures, event loop, type coercion, data structures, algorithms, and gotchas
- 20-second timer with SVG countdown ring — correct answers earn a 2-second bonus
- Streak multiplier up to x5 — build momentum for massive scores
- 3 lives — wrong answer or timeout costs one; game over at zero
Features
Leaderboard
Scores are persisted to Redis via Upstash with weekly and all-time sorted sets. The top 10 are shown on the start card and game-over screen with gold/silver/bronze badges.
Achievements
Unlock achievements for milestones: First Blood, Perfect 20, Speed Demon, Comeback, and Sharpshooter. All stored in localStorage — no server needed.
Referral Opportunities
Score 80% or higher and you'll see a referral card for opportunities. The URL is configurable via environment variable.
Shareable Result Cards
Save your score and get a unique result page with an OG image card — perfect for sharing on social media.
Printable Certificate
The result page includes a printable completion certificate with your score, accuracy, and rank.
Daily challenge
A deterministic daily challenge picks one question from the bank — check back every day for a new one.
Tech stack
- Next.js 16 App Router + TypeScript
- Mantine v9 components + SCSS Modules
- Upstash Redis for leaderboard persistence
- PostHog analytics (consent-gated)
- Playwright E2E tests + Vitest unit tests
Try it
Head to flabs.tech/quiz and test your JavaScript fundamentals. Can you reach Staff rank?
