Unlock all of SDQ, for good
One payment unlocks every lesson, Building with AI, every challenge and AI mock interviews. No subscription, no renewals.
Pro includes
- All 232 lessons: every everyday app and all seven levels of system design
- Building with AI: models, RAG, agents and AI system design
- Every simulator challenge, checked by the server
- AI mock interviews with a scorecard
- Lifetime access, including new lessons as they’re added
One-time payment, processed securely by Dodo Payments. All sales are final: no refunds (see Terms).
Free for everyone
- Everyday apps: the Basic lessons
- System design Level 0: how the web works
- The first lesson of every level and section
- The sandbox, the Library and the Pop quiz