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Interview-ready system design training

Stop Reading Theory.
Practice Real System Design.

Learn how strong senior candidates answer: concrete assumptions, architecture tradeoffs, failure modes, and scaling decisions under pressure.

Start free. No subscription required for premium unlock.

Structured for interviews
Every project follows the same interview-ready structure so practice is consistent and repeatable.
Built on real tradeoffs
You compare concrete choices across latency, throughput, consistency, reliability, and cost.
Practice, not passive reading
Simulation mode gives timed prompts and debrief feedback so you can iterate quickly.

What You Actually Improve

Focused on the parts that usually break in system design interviews.

Scoping Discipline
Define requirements, SLOs, and constraints cleanly before architecture discussion starts.
Decision Quality
Explain why one design was chosen over alternatives, and when it breaks at 2x and 10x scale.
Operational Thinking
Handle failures, define mitigations, and tie monitoring signals to concrete incident actions.

Choose Your Learning Path

Start with free content, then move to full-depth practice when you want complete coverage.

Free Path
Great for getting a feel for the learning style and project depth.
  • Selected free projects
  • Core architecture walkthroughs
  • Interview-style structure and reasoning flow
Full Access Path
Best for complete interview preparation and repeated deliberate practice.
  • Everything in the free path
  • Full premium project catalog
  • AI-guided interview simulations on all projects
  • Deeper practice coverage for senior-level interview prep
1. Study
Walk through complete architectures with API, data model, scaling, and failure analysis.
2. Simulate
Answer timed section prompts exactly like an interview loop and stress-test your reasoning.
3. Iterate
Use score breakdowns to close gaps in coverage, specificity, tradeoffs, and risk handling.

Who This Is For

Built for engineers who want better interview outcomes, not more passive content.

Interview Prep (Mid → Senior)
You know common patterns, but need stronger structure, tradeoff depth, and failure response quality.
Hands-On Engineers Leveling Up
You want to make architecture decisions with clearer cost/performance tradeoffs and operational rigor.

Common Questions Before Buying

Is this too advanced?
Start with free projects first. The structure stays consistent so progression is straightforward.
Why one-time payment?
You keep lifetime access to purchased content, and can practice on your own timeline.
Will this help interviews?
The content and simulation flow are designed around how interviewers assess scope, tradeoffs, and operational rigor.

Free Projects

Try the product first, then unlock the full premium catalog with a one-time purchase.

URL Shortener at Global Scale
Design a globally distributed URL shortener that handles billions of redirects per day with low latency, abuse controls, and reliable analytics.
IntermediateUrl ShortenerCachingEdge
API Rate-Limiting as a Multi-Region Service
Design a globally consistent rate limiting service with low latency and multi-region enforcement.
AdvancedRate LimitingApiMulti Region
Feature Flag Evaluation Engine at Scale
Design a low-latency feature flag evaluation system with targeting rules, percentage rollouts, A/B testing integration, kill switches, and multi-region consistency.
IntermediateFeature FlagsEdgeCaching

Ready to Practice Like a Real Interview?

Start with free projects in minutes, then unlock full access when you want broader coverage.