Live distributed system
Build systems.Survive failures.
SystemCraft is an AI-powered system design interview simulator that makes architecture feel alive before the first question is even asked.
AI feedback
Reasoning + structure
Chaos events
Failures, spikes, reroutes
Replayable
Iterate like an interview
The Architecture Journey
> WHAT IS SYSTEM DESIGN?
A set of trade-offs where latency, cost, reliability, and complexity pull in different directions.
> HOW DISTRIBUTED SYSTEMS BEHAVE
Traffic, queues, caches, replicas, and timeouts shape what the user actually experiences.
> HOW DISTRIBUTED SYSTEMS BEHAVE
Traffic, queues, caches, replicas, and timeouts shape what the user actually experiences.
> FAILURES HAPPEN
Every architecture eventually sees a node drop, a queue grow, or a database stall under pressure.
> AI INTERVIEW BEGINS
The interviewer changes the constraints and watches how fast the architecture adapts.
> AI INTERVIEW BEGINS
The interviewer changes the constraints and watches how fast the architecture adapts.
> YOU RECEIVE FEEDBACK
Structural issues and reasoning gaps are surfaced with direct, actionable guidance.
> BECOME INTERVIEW READY
Build the muscle memory to explain systems with confidence under realistic pressure.
> BECOME INTERVIEW READY
Build the muscle memory to explain systems with confidence under realistic pressure.
Core Concepts
Available Scenarios
Distributed Caching
>_desc:Analyze and implement in-memory data grids to absorb massive read-heavy traffic spikes.
Live system
See the architecture respond.
One event at a time. Every signal explains what changed, where pressure moved, and why the system recovered.
Cache warmingAdapting
Cold reads briefly reach the primary while popular keys enter memory.
More hits remove database work
Tail latency reveals saturation
Depth exposes consumer backpressure
Load Balancer
Request distribution
Even spread protects every replica
✓System Ready
Architecture validated
✓Cache configured
✓Failover configured
✓Scaling configured
Ready to begin interview
Your architecture can handle the first constraint.
Frequently Asked Questions