The network for creativity
Join 1.25M professional creatives like you
Connect with clients, get discovered, and run your business 100% commission-free
Creatives on Contra have earned over $150M and we are just getting started
Back to feedPost
System Design Sandbox: Simulate Architectures for FAANG Prep
Built this interactive tool to make system design interviews hands-on. Pick scenarios like URL Shortener (5k RPS, 100ms P95), drag 9 components (CDN, Redis, Kafka), connect flows on an infinite canvas, and run simulations for instant latency/capacity feedback. No code needed.
Key features: Real-time bottleneck detection, shareable designs via URL, mobile-friendly.
Tech: React/Next.js frontend, Node.js backend, Vercel deploy, WebSockets for live sims.
Impact: Beta users cut prep time 40%. One tester aced a senior engineer interview.
Live demo: systemdesignsandbox.com
Need a custom sim tool for your team? DM me.
The network for creativity
Join 1.25M professional creatives like you
Connect with clients, get discovered, and run your business 100% commission-free
Creatives on Contra have earned over $150M and we are just getting started
Trending
maxearnings
The next frontier of payments is live on Contra. How are you maximizing revenue?
micrographics
Micrographics started as utility - barcodes, packaging, instruction labels. How would you use them?
aidesignflow
AI tools are redefining how designer work. What does your workflow look like?
aivideo
AI video tools are moving at warp speed. What tools are you using?
whennotai
As AI accelerates, creative judgment matters more. What part of your work stays human?