System Design Companion

System design, at your level.

A conversational AI that teaches system design the way you actually need to learn it — whether you're a product manager building intuition or an engineering leader sharpening your edge.

For product managers

Build your system design intuition

Start from zero. Learn how the internet works, what databases and APIs actually do, and how to talk confidently with engineers — using plain English and real-world analogies throughout.

The big picture & core building blocks
Scaling, databases, APIs, caching
Real-world design walkthroughs
PM interview preparation
Start learning →

For engineering leaders

Sharpen your senior-level edge

Built for HoEs, senior EMs, and VPs. Go deep on distributed systems trade-offs, advanced architecture patterns, and the leadership dimensions that come up in senior interviews and day-to-day decisions.

CAP theorem, consistency, fault tolerance
Event sourcing, CQRS, saga patterns
Multi-region, observability, reliability
Staff/Principal/EM/VP interview prep
Start learning →