SD Primer

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.