Practice for real interview decisions
Plans & Pricing
Start free. Upgrade when you want the complete Senior Dev Challenge and System Design libraries.
40+
System Design scenarios
Production
Senior incident scenarios
Instant
Scenario-specific feedback
$0
Core quiz experience for everyone.
- ✓Access to 10000+ questions across 20+ technologies
- ✓3 difficulty levels (Junior, Mid, Senior)
- ✓Save quiz history, scores and detailed results
- ✓Profile with basic stats, activity and certifications
- ✓3 free Senior Dev Challenge and 3 free System Design scenarios
$9.99 / month
Full access to real interview scenarios.
One membership · Senior Challenge + System Design
- ✓Scenario-specific review across Easy, Medium, and Hard designs
- ✓Full access to Senior Dev Challenge scenarios
- ✓System Design Interview Simulation: full access to 40+ scenarios
- ✓Access new Premium scenarios as they are added
- ✓Cancel anytime, no long-term commitment
What Premium actually changes
Build the architecture instead of watching a solution
Each System Design scenario demands a different request path, scale assumption, and trade-off. The review checks the flow you actually connected and the decision that makes the scenario distinct—not just the boxes you placed.
- ✓Disconnected components do not earn credit
- ✓Concrete coaching for missing or incorrect connections
- ✓Easy, Medium, and Hard require genuinely different decisions
- ✓One membership unlocks System Design + Senior Dev Challenge
Score
72%
- ✓Client → Gateway → App request path is connected
- ✓Durable storage participates in the flow
- !Cache is missing from the hot request path
Connect App → Cache and explain the invalidation decision.
Try the workflow before paying
Use the free URL Shortener scenario to read the brief, connect an architecture, and see the real review. Upgrade only when you want to practise across more problem families.
Try the free review →