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systemInPain
Learn system design by watching it break in real time
Build an architecture, then throw real simulated traffic at it. systemInPain runs a deterministic queueing-and-network simulator underneath — no keyword scoring. Watch p99 spike, nodes saturate red, and queues back up live. 15 levels, free to start,
Hey Product Hunt 👋
Most "system design practice" is either a whiteboard with no feedback, or a quiz that scores you for having the right buzzwords in the right boxes. I wanted something that actually tells you when you're wrong — the way a real system does, under real load.
systemInPain is a system design game where you drag components (load balancers, caches, queues, replicas...) onto a canvas, wire them into an architecture, and hit simulate. A deterministic engine runs seeded traffic through your graph and measures what actually happens: p99 latency, availability, cost per hour, throughput. Get the fan-out wrong and load doubles instead of halves. Skip the cache and watch your DB melt. Forget a queue and bursts drop requests. It's graded, not guessed.
15 levels take you from a basic TinyURL clone through flash-sale traffic spikes, read replicas, CDNs, async write queues, failover, and bot/DDoS traffic — each one teaching a single, specific lesson you can see land or fail.
Level 1 is free, no signup. It's still early — would love your feedback (there's a link right in the footer, it comes straight to me).
Try it: systeminpain.com
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About systemInPain on Product Hunt
“Learn system design by watching it break in real time”
systemInPain was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #106 on the daily leaderboard. Build an architecture, then throw real simulated traffic at it. systemInPain runs a deterministic queueing-and-network simulator underneath — no keyword scoring. Watch p99 spike, nodes saturate red, and queues back up live. 15 levels, free to start,
systemInPain was featured in Design Tools (261.3k followers), Education (78.8k followers), Developer Tools (515.9k followers) and Vercel Day (26 followers) on Product Hunt. Together, these topics include over 148.3k products, making this a competitive space to launch in.
Who hunted systemInPain?
systemInPain was hunted by mustafa ahmed. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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