InterviewOS

Stop memorizing. Start mastering.

InterviewOS is your all-in-one interview preparation app built for Flutter and Swift developers. Whether you're preparing for your first junior role or aiming for a senior position, InterviewOS gives you everything you need — lessons, exercises, quizzes, and real interview questions — all in your pocket.

Pick your track. Start learning. Choose Flutter/Dart or Swift/iOS as your main focus. All content adapts to your selection — from beginner fundamentals to advanced topics. Switch tracks anytime.

Duolingo-style exercises No boring walls of text. No typing long code. Just quick, tap-based challenges you can crush in 30 seconds: • Multiple choice questions • Fill-in-the-blank with word banks • Drag-to-reorder code lines • Spot-the-bug challenges • Swipe true or false • Match-the-pairs

500+ interview questions Real questions asked at real companies. Organized by topic and difficulty — from junior to senior level. Each question comes with a detailed model answer, follow-up questions, and common mistakes to avoid.

General programming too Not just framework-specific. InterviewOS covers REST APIs, WebSockets, design patterns, SOLID principles, data structures, Git, system design, security, and more — the topics every interviewer asks about.

Track your progress Earn XP, level up from Junior Dev to Principal Dev, maintain your daily streak, and unlock achievements. See exactly where you stand on every topic.

100% free. No ads. No paywalls. Every lesson, every exercise, every question — completely unlocked from day one. No subscriptions. No in-app purchases. No ads. Built by a developer, for developers.

Works offline No internet? No problem. All content is available offline so you can practice on the subway, on a plane, or anywhere.

Download InterviewOS and start preparing for the job you deserve.