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Hey HN,
I built Buildex (https://buildex.dev) to help engineers practice system design interviews interactively.
The problem: System design prep usually means reading blogs or watching videos passively. There’s no way to actually practice designing systems and get feedback.
How it works:
- Pick a challenge (URL shortener, rate limiter, chat system, etc.)
- Drag-and-drop components onto a canvas to design your architecture
- Connect them to show data flow
- Submit and get scored on efficiency, cost, and reliability
- AI evaluates your design and gives specific feedback
Tech stack:
- Frontend: React + Vite
- Backend: Go
- Database: PostgreSQL
- AI: Claude API for design evaluation
- Payments: Razorpay
Free tier gives you 2 AI evaluations/day….
Hey HN,
I built Buildex (https://buildex.dev) to help engineers practice system design interviews interactively.
The problem: System design prep usually means reading blogs or watching videos passively. There’s no way to actually practice designing systems and get feedback.
How it works:
- Pick a challenge (URL shortener, rate limiter, chat system, etc.)
- Drag-and-drop components onto a canvas to design your architecture
- Connect them to show data flow
- Submit and get scored on efficiency, cost, and reliability
- AI evaluates your design and gives specific feedback
Tech stack:
- Frontend: React + Vite
- Backend: Go
- Database: PostgreSQL
- AI: Claude API for design evaluation
- Payments: Razorpay
Free tier gives you 2 AI evaluations/day. I’m a solo dev and built this over the past few months while prepping for interviews myself.
Would love feedback on:
- Challenge difficulty/variety
- Scoring system fairness
- UI/UX issues
- What’s missing?
Happy to answer any questions about the implementation.
Comments URL: https://news.ycombinator.com/item?id=46404153
Points: 1
# Comments: 0