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Hey Product Hunt! 👋
I built BuildTheSystem because I noticed something about system design interviews: the hardest part isn't knowing the concepts — it's talking and drawing at the same time, under pressure, while someone watches.
You can read all the books and watch all the videos, but nothing prepares you for narrating your thinking out loud while sketching a load balancer. So I built a mock interviewer that does what a real one does:
🎙️ It listens while you think out loud — and actually waits when you're drawing instead of talking over you
🧩 You draw with a typed palette (load balancer, Postgres, Kafka), so every component is structured data — no messy sketch recognition guessing at your boxes
⚡ It reacts to your diagram in real time. Connect a client straight to your database? You'll get asked about it the moment you draw the line — just like a real interviewer would.
This is the practice tool I wish I'd had before my own interviews. I'd love to hear what you think especially from anyone prepping for interviews right now. What would make this more useful for you?
Happy to answer any questions in the comments all day. 🙌
try it here: https://buildthesystem.xyz
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About BuildTheSystem on Product Hunt
“Design a System that can talk to you”
BuildTheSystem was submitted on Product Hunt and earned 3 upvotes and 1 comments, placing #139 on the daily leaderboard. Learn and Design a system that can talk to you
BuildTheSystem was featured in Education (79.1k followers), Developer Tools (519k followers) and Artificial Intelligence (478.1k followers) on Product Hunt. Together, these topics include over 235.7k products, making this a competitive space to launch in.
Who hunted BuildTheSystem?
BuildTheSystem was hunted by Luffy. 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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