Domain Arrivals
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Featured in Domain Arrivals · 2026-08-10

wtfunction turns system design into drag-and-drop failure games

wtfunction.dev ↗ · Developer Corner · score 86.0
○Open: public page gives enough substance to understand the site $Paid: pricing, booking, ecommerce, subscription, or paid access is visible ADAds: visible ad load or ad-supported content ✦Pretty: notable design, copy, craft, or presentation ◆Pro: polished, finished-feeling, serious, or operationally mature ◇Niche: specific audience, workflow, or unusually focused use case ◉Human: personal, local, community, civic, handmade, or real-person signal !Suspicious: scammy, spammy, trust theater, finance fog, or credibility concern

An interactive training site with 111 system-design problems across databases, AI engineering, networking, security, APIs, and distributed systems.

Why it surfaced

Instead of asking users to read architecture diagrams, wtfunction makes them build one: place the cache, database, boundary, or control in the wrong spot and watch the resulting incident replay. Its bluntly memorable name and companion terminal command give the project a bit of personality beyond ordinary interview prep.

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Ham Is Specifically Discouraged

August 10’s newborn domains include a mock cryptid council that specifically discourages ham, a vintage phone collecting messages for Twyla’s 70th, a 4.5-meter dish measuring Galactic hydrogen at 1420 MHz, and an open index that found 530 sites permitting GPTBot in robots.txt while refusing it at the server.

This is one of 1,000 discoveries in the 2026-08-10 Domain Arrivals issue.

Explore the complete issue Browse Developer Corner

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