System design,
zero to Staff.
The interactive platform that combines Educative structure, ByteByteGo diagrams, and Hello Interview coaching. See it. Scale it. Break it. Defend it.
Built around how senior engineers actually think
Not a course, not a wiki. A system for turning curious engineers into confident architects.
Curriculum
Zero → Staff, taught visually. Every concept with diagrams, animations, and interactive simulations.
Framework
The Hello-Interview method as the platform's spine: Requirements → Core Entities → API → High-Level → Deep Dive → NFRs.
Practice
Playground, Failure Sim, Quiz, Cheat Sheets, Scale Slider — you don't just read, you build and break.
Coaching
AI Interviewer (bring your own key), delivery scoring, and speech-to-text mock — no $200/hr human coach required.
Growth
SEO landing pages, shareable OG diagrams, verifiable certificates, and a Learn-in-Public wall.
Six ways in. Every card opens a working page.
Click through. Every interaction on the destination page is real — the site is the demo.
The Framework
Six phases that turn a scary interview into a checklist.
OpenRequirements → Scale → Bottleneck → Solution
The thesis of the whole platform, taught in one interactive loop.
OpenURL Shortener (all 4 scales)
Watch the architecture evolve from 10K RPS to 1B RPS. The same problem, four different systems.
OpenNetflix Streaming (~250M users)
Open Connect, adaptive bitrate, Simian Army, regional failover — deconstructed with citations.
OpenMeta interview loop
Product-focused system design + infra round split. What they grade. What to avoid.
OpenKill Redis. Watch what happens.
Fault injection with propagation animation and post-mortem notes.
OpenEvery company grades differently
What Meta rewards is not what Amazon rewards. We tell you what each company actually looks for.
Free at launch. Extensible forever.
Every concept, component, pattern, problem, and case study is authored in MDX + data. Adding a new system-design problem is a 15-minute contribution. The entire codebase is public and MIT-licensed.