Feed System
Practice System Design Interviews with Structured Feedback
Ask anything about your interview prep — then practice a real system and see what to fix.
Practice Real System Design Problems
Real-world problems from actual interviews. Pick one and start designing—AI guides you through each stage.
Design Challenges
A real system just broke. Read the incident, spot the flaw, and fix the design.
Incident · Traffic spike
Notifications broke in a flash sale
Push alerts arrive late or twice at peak traffic. Find why and fix the design.
Fix the designIncident · Cache stampede
The cache that took down our API
A cache flush sends every request to the database at once. Stop the stampede.
Fix the designIncident · Rate limiting
One tenant overloaded the API
The rate limiter let a single customer slow everyone down. Close the gap.
Fix the designToday's challengeDay 26
Game Leaderboard System Design
Next question in —
Someone just completed: URL Shortener
How it worksFix next: explain how you handle hot short links — add a cache and say what happens when it misses.
From a real problem to an interviewer-style review
The same loop as a real system design interview: design it, explain your trade-offs, and get feedback you can act on.
Step 1: Pick a real interview problem
Choose from 50+ problems like WhatsApp, Twitter, or Uber and start right away.
Step 2: Design step by step with guidance
Work through requirements, APIs, scale, high-level design, and trade-offs.
Step 3: Get a structured review
See strengths, gaps, red flags, and clear next steps — scored like an interview rubric.
What you get after each session
A concrete output for your next attempt — no guessing what “good” looks like.
- A rubric summary of strengths and gaps by stage
- Red flags an interviewer would notice — and how to fix them
- Specific next actions: what to add, remove, or clarify
- A checklist of what to say out loud in the interview
Sample review · URL Shortener
6.8 / 10- RequirementsStrong
- Scale & dataGap
- Trade-offsRed flag
Traditional System Design Prep vs Practice on InterviewCrafted
Most prep is read-only. Here’s how practicing on a canvas with AI feedback is different.
How you practice
Traditional learning
Read articles, watch videos — mostly passive, no hands-on design.
InterviewCrafted
Interactive canvas: draw components, connect services, reason in real time.
Feedback
Traditional learning
None or delayed; no interviewer-style input on your design.
InterviewCrafted
AI interviewer feedback at each stage — gaps, constraints, senior-level signals.
Interview simulation
Traditional learning
No structured flow; hard to rehearse the real interview loop.
InterviewCrafted
Stage-by-stage flow: problem → requirements → design → tradeoffs → improve.
Where you build
Traditional learning
Whiteboard or paper only; no shared, reusable artifact.
InterviewCrafted
Visual architecture canvas with components (DB, cache, API, etc.).
Outcome
Traditional learning
Concepts only; little repetition of the actual practice loop.
InterviewCrafted
Real practice loop: design → get feedback → improve — like a real interview.
| Compare | Traditional learning | InterviewCrafted |
|---|---|---|
| How you practice | Read articles, watch videos — mostly passive, no hands-on design. | Interactive canvas: draw components, connect services, reason in real time. |
| Feedback | None or delayed; no interviewer-style input on your design. | AI interviewer feedback at each stage — gaps, constraints, senior-level signals. |
| Interview simulation | No structured flow; hard to rehearse the real interview loop. | Stage-by-stage flow: problem → requirements → design → tradeoffs → improve. |
| Where you build | Whiteboard or paper only; no shared, reusable artifact. | Visual architecture canvas with components (DB, cache, API, etc.). |
| Outcome | Concepts only; little repetition of the actual practice loop. | Real practice loop: design → get feedback → improve — like a real interview. |
Two ways to prepare
Practice on your own, or get guided prep with a mentor. You can start with one and add the other later.
Pro
Self-serve
Practice on your own schedule with instant AI feedback.
- 50+ real interview problems
- Interactive design canvas
- AI review after every attempt
Mentorship
With a mentor
A real mentor finds your gaps and guides what to fix next.
- Mock interview with a mentor
- Personal practice plan
- Help when you’re stuck
Mentorship
Know where you stand. Know what to fix next.
Take a realistic system design mock interview with a mentor. Get clear feedback, a personalized practice plan, and guidance on what to work on next.
Explore learning paths
Tap a path to open the full library. Scroll down on this page to browse featured topics in each area.
System Design Guides
Interview guides—requirements, HLD, APIs, and production angles.
Architectural Thinking
Design principles, trade-offs, and system architecture.
Production Stories
Real incidents, failures, and scaling challenges.
System Fundamentals
OS, memory, networking, databases, and more.
System Design Guides
View allLong-form interview guides—requirements, HLD, APIs, and production angles—with a path into hands-on practice.
Architectural Thinking
View allDesign principles, trade-offs, and system architecture
FRAMEWORK
Design Thinking Framework
Learn how to break vague problems into solvable pieces.
PRINCIPLES
Design Principles
SOLID, DRY, KISS, YAGNI, and other principles for building maintainable software.
TRADE-OFFS
Architecture Trade-offs
Understand when to choose consistency over availability, and vice versa.
Production Stories
View allReal incidents, failures, and scaling challenges
INCIDENT
Configuration Outages
How a simple configuration change caused a 3-hour outage for millions of users.
SCALING
Connection Pool Exhaustion
What happens when your database connection pool gets exhausted at peak traffic.
ARCHITECTURE
Scaling from 1K to 10M Users
How to scale a system from 1,000 to 10 million users without rewriting everything.
System Fundamentals
View allOperating systems, memory, networking, and databases
More ways to explore
50+
Practice Problems
AI-Powered
Instant Feedback
100+
Topics & Stories
Real-World
Production Systems
What You'll Find Inside InterviewCrafted
Content Pillars
Pick your next step
Find your weak spots, get the basics down, or tell us what to build.
60-second quiz
Not sure what to practice next?
Answer a few quick questions and find your system design weak spots.
Start here
New to system design?
Read our step-by-step guide on how to prepare — what to learn first and how to practice.
Shape the roadmap
What should we build next?
Tell us which topics and features matter to you, and we’ll prioritise them.
About InterviewCrafted
InterviewCrafted is an AI-powered platform designed to help you master system design interviews. We focus on real-world practice, not rote memorization. Build scalable systems, understand trade-offs, and get instant AI feedback to refine your architectural thinking.