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.