SysWise
An iOS system-design interview prep app, live on the App Store, with a personal learning path, spaced repetition, and app UI in 30 languages.
SysWise is an iOS app, live on the App Store, for preparing for system-design interviews. It turns a stated goal and level into a personal path across four tracks, then runs a practice loop that brings back the topics you get wrong.
Reviews are scheduled with SM-2 spaced repetition, and readiness is shown as a mastery score with topic coverage. Streaks, XP, and weekly leagues keep practice going, and sessions are server-authoritative so XP cannot be farmed.
It is built with Expo and React Native on a Hono API with Drizzle, PostgreSQL, and pg-boss on Bun. Lesson content is produced through an LLM pipeline on OpenRouter, and subscriptions run through RevenueCat.
Highlights
- Personal learning path across four tracks
- SM-2 spaced repetition on past mistakes
- Sign in with Apple and Google
- App UI in 30 languages
Challenges
- System-design prep is usually a reading list, so candidates cannot tell which topics they have actually mastered.
Outcomes
- Live on the App Store since August 2026
- Spaced repetition and readiness scoring
- App UI in 30 languages
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