SD Primer

Ace system design interviews with 5-minute daily quizzes, hands-on architecture labs, and a full AI/ML course. Build real engineering instincts—one day at a time.

Think like a staff engineer — five minutes a day.

SD Primer turns system design mastery into a daily habit. Answer today's questions, debug a broken architecture with your hands, and build the instincts that tech interviews (and real jobs) demand.

YOUR DAILY RITUAL • Daily Quiz — five sharp multiple-choice questions on scalability, databases, caching, queues, and trade-offs, with clear explanations for every answer • Focus Practice — we detect your weakest topics and serve extra reps exactly where you need them • Streaks, XP, and levels that make consistency effortless

HANDS-ON ARCHITECTURE LABS Don't just read about system design — fix it. Each lab drops you into a live incident: drag components onto the canvas, wire the fix, defend your reasoning, and get scored with strengths and trade-offs.

LEARN AI & ML FROM FIRST PRINCIPLES A structured 64-lesson course, one daily read at a time: from the origins of AI through neural networks, transformers, and how to actually use LLMs well — written for software engineers, no math degree required.

AND EVERY DAY • Coding pattern drills — name the algorithm behind the problem • Workplace mastery lessons — the soft skills that get engineers promoted • Curated engineering news and daily tips • Your progress, visualized: topic strength, consistency calendar, achievements

SD PRIMER PRO Unlock custom quizzes, labs, and pattern sessions tuned to your goals, plus higher daily limits. Subscriptions auto-renew unless cancelled at least 24 hours before the end of the period; manage anytime in your App Store account settings.

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Start today. Your future self at the whiteboard will thank you.