Build on the canvas
Drag real components — load balancers, caches, queues, databases — and wire them into a working architecture. No templates. No hand-holding. Just you and a blank canvas, the same way an interviewer will see it.
PRISM — System Design Simulator
Design systems like a FAANG engineer.
Get evaluated like one too.
PRISM gives you a real canvas, real constraints, and an AI that scores your architecture the way an interviewer would — component by component.
Used by engineers from
Why PRISM?
Every letter has a purpose
The PRISM framework mirrors exactly how senior engineers evaluate system design.
- Problem Understanding Clarify what you're building
- Requirement Analysis Capture FR & NFR
- Identification of Components Map services & boundaries
- System Architecture Design the full diagram
- Mitigations Bottlenecks and tradeoffs
Everything you need to prepare for system design
Four distinct modes. One unified platform.
Roadmap Mode
Follow a structured learning path from beginner to advanced. Master Requirements, Networking, API Design, Databases, Caching, and more — with tradeoffs at every step.
- 20+ structured topics
- Beginner → Advanced levels
- Tradeoffs & talking points
- Interview-ready notes
Practice Mode
Build any system architecture on a drag-and-drop canvas. Validate the graph, run traffic simulations, detect bottlenecks, and get instant structural feedback.
- Visual canvas builder
- Graph validation engine
- Traffic simulation
- Bottleneck detection
Learn Mode
Explore preset system architectures with guided walkthroughs. Study how real systems evolve stage by stage — from a single server to production-grade scale.
- Guided preset designs
- Stage-by-stage evolution
- FAQ for each system
- Learn from real examples
Evaluate Mode
Simulate a real interview from end to end. Choose a problem, design your solution, answer MCQs, respond to trade-off questions, and receive an AI-scored report.
- Real interview problems
- FR & NFR requirement input
- MCQ + trade-off scoring
- AI evaluation report (PDF)
How it works
Three steps from blank canvas to a score you can act on.
Run the simulation
Fire live traffic at your design and watch it respond in real time. See where throughput saturates, where latency spikes, and which components become bottlenecks under load — before an interviewer finds them for you.
Get your AI score
Answer MCQs, defend your tradeoffs, and receive a rubric-based AI evaluation that breaks down exactly how your design holds up — component by component, the same way a senior interviewer would grade it.
Built for serious interview prep
AI Architecture Review
After every evaluation, get scored feedback on scalability, reliability, bottlenecks, and tradeoffs — not just a pass/fail.
Traffic Simulation
See throughput, latency estimates, and saturation points in real time as you add or remove components from your design.
Structured Roadmap
20 topics from Requirements to Data Modeling, each with beginner and advanced levels, tradeoffs, and interview talking points.
MCQ + Trade-off Scoring
Answer interview-style questions and justify your choices. Receive a deterministic, rubric-based score for each decision.
Workspace Persistence
Save designs, resume evaluations mid-session, and track your improvement across multiple practice runs over time.
Real Problem Bank
Practice with Easy, Medium, and Hard system design problems drawn from real interview loops at top-tier companies.
Ready to design better systems?
Join engineers already using PRISM to prepare for their next system design interview.