Langur - Sharpen Dev Skills

You delegate more of your implementation to AI every week. It's faster — but the skills you're not using are quietly going dormant. The depth you need to verify AI output, architect real systems, and debug when the abstractions break doesn't maintain itself. Langur is the daily habit that keeps it sharp. Five minutes a day of focused flashcards and quizzes across the domains you already know — designed to reactivate recall, not teach you from scratch. No courses. No interview grinding. Just enough friction to keep your edge. WHAT YOU GET - Daily flashcards — bite-sized concepts with a hook, a clear explanation, and follow-up questions that surface what you think you know but can't quite articulate anymore. - Daily quizzes — short 5-question sets that catch the gaps. Plausible wrong answers, not softballs. - Streaks & stats — build a daily habit and watch your depth come back, tracked by topic so you know exactly where you're sharp and where you've gone rusty. TOPICS - System Design — distributed systems, tradeoffs, scaling patterns - Backend Engineering — request lifecycles, idempotency, caching, concurrency - Web Fundamentals — HTTP, browsers, rendering, the layer beneath the frameworks - React Development — what the framework actually does under the hood - Android Development — the platform depth AI tools gloss over - DevOps & Cloud — CI/CD, infrastructure, the skills you set up once and forgot - AI & Machine Learning — stay ahead of the tools you're leaning on - Databases & Storage — the SQL depth ORMs quietly took from you WHO IT'S FOR Langur is built for working engineers who were fluent once and want to stay that way. If you already know these domains but feel them slipping to disuse, this is your daily maintenance habit. It is NOT interview prep. No DSA grinding, no LeetCode-style drilling. And it's not a place to learn a domain from scratch — it's for reactivating skills you already have, not building ones you never did. HOW IT WORKS Open the app. Do today's cards. Take today's quiz. Keep your streak. Five minutes, every day, on the skills that matter most in an AI-assisted workflow. The engineers who stay valuable aren't the ones who delegate everything — they're the ones who still understand what they're delegating. Langur keeps you in that group. Download Langur and keep your edge sharp.