SD Primer

Master system design interviews in just 5 minutes a day. Daily quizzes, incident labs, coding patterns & curated tech news - built for engineers who want to level up.

SD Primer is the daily habit that prepares you for system design interviews and levels up your engineering career.

Every day, you get a fresh set of system design questions, real-world incident challenges, and coding pattern exercises - designed to build deep, lasting knowledge through spaced repetition.

DAILY PRACTICE, REAL RESULTS

• 5 daily system design MCQs with detailed explanations
• Real-world incident lab challenges based on actual outages
• Coding pattern recognition exercises across all difficulty levels
• Spaced repetition ensures you retain what you learn

STAY SHARP, STAY INFORMED

• Curated daily tech news for software engineers
• Daily tips covering architecture, scalability, and trade-offs
• Workplace mastery lessons for career growth

TRACK YOUR PROGRESS

• Streaks, XP, and levels to keep you motivated
• Topic strength breakdown to see where you excel
• Full attempt history with performance analytics

PRO FEATURES

• Customize quizzes, labs, and patterns to target your weak areas
• Adjust daily question count and difficulty to match your level
• Personalized news feed tailored to your career goals
• Priority feature requests to shape the app's roadmap

Whether you're preparing for interviews or building your system design fundamentals, SD Primer turns idle minutes into career-changing knowledge.

Download now and start your daily system design habit.

By using this app, you agree to Apple's Standard License Agreement: https://www.apple.com/legal/internet-services/itunes/dev/stdeula