SD Primer

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