Design an Experimentation Platform
Design (not build) an experimentation platform for a hypothetical company. Senior-level systems-design exercise.
Whatever you want for diagrams (Excalidraw, Mermaid)
About this project
Senior DS interviews increasingly include "design an A/B testing platform" as a system-design question. This project is the write-up version — a 5-10 page document covering hypothesis tracking, assignment service, metric registration, statistical engine, and the org model. No code required, but the rigor must be senior-level.
Why build this in 2026?
Experimentation platform design is asked in senior DS interviews at Meta, Booking, Netflix, Stripe.
What you'll ship
- Design doc (5-10 pages)
Architecture diagrams
Discussion of build vs buy (Optimizely, Statsig, GrowthBook)
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Skills you'll practice
ab testingexperimentationsystem design