SD Primer delivers daily drills, AI-guided challenges, and structured learning paths that build real system design intuition — not just interview tricks.
Daily System Design Training
Practical Interview Prep
Track Your Growth
Built for Engineers
FEATURES
From daily drills to AI-guided challenges, SD Primer covers every angle of system design mastery.
One carefully curated system design question every day. Build consistency with bite-sized learning that compounds over time.
Patch broken architecture diagrams in 3-5 minute visual challenges. Face AI-guided follow-up questions that sharpen your thinking.
60-second interview tips after each question. Learn the key idea, common mistakes, and exactly how a senior engineer would phrase it.
Track your daily streak, earn XP, level up, and unlock achievements. Make consistent learning feel like progress, not a chore.
Master essential patterns like Sliding Window, Two Pointers, BFS, DFS, and Dynamic Programming with targeted practice sets.
Stay current with curated news across AI, architecture, security, and hiring trends. Know what senior engineers are talking about.
SYSTEM DESIGN LAB
The Lab gives you a broken system and a ticking clock. Drag components onto the architecture diagram to fix it, then defend your solution to an AI reviewer. It's the closest thing to a real system design interview — in your pocket.
Read the incident briefing
Understand what went wrong in the system
Patch the architecture diagram
Add components to fix the broken system
Defend your fix to the AI reviewer
Answer follow-up questions about your design decisions
Get scored with detailed feedback
Tradeoffs, key takeaways, and reasoning quality
CODING PATTERNS
Most coding interview problems are variations of ~15 core patterns. Train your pattern recognition daily so the solution becomes obvious before you write a single line of code.
BEYOND INTERVIEWS
SD Primer isn't just interview prep. It's a daily operating system for engineers who want to think, communicate, and ship like senior staff.
Daily scenarios that teach you how to navigate real engineering situations — from pushing back on feature requests to communicating tradeoffs.
A step-by-step playbook used by top engineers to ace any coding interview. Master the process, not just the problems.
A checklist of best practices that top candidates follow to make their take-home project submissions stand out.
STAY INFORMED
Curated articles across AI, architecture, security, hiring, and startups — each with an AI-generated summary and key takeaways. Know what senior engineers are talking about without drowning in feeds.
WHY IT WORKS
Two minutes a day. That's all it takes to keep your streak alive and your system design skills sharp.
Our smart queue resurfaces topics at optimal intervals, so knowledge sticks for interviews and beyond.
Every question maps to real-world scenarios you'll face in senior and staff-level interviews.
Watch your streak grow, your XP accumulate, and your topic mastery expand — proof that daily effort compounds.
TESTIMONIALS
SD Primer made system design click for me. The daily format means I actually stick with it — unlike courses I'd abandon after week two.
Alex Chen
Senior Software Engineer
The incident lab challenges are brilliant. Patching architecture diagrams under pressure is exactly the kind of practice that translates to real interviews.
Priya Sharma
Staff Engineer
I went from dreading system design rounds to looking forward to them. The Signal Tips alone are worth it — finally, interview-ready phrasing.
Marcus Johnson
Engineering Manager
Make daily engineering growth your unfair advantage.