Overview
What this challenge is about.
Implement a 4-phase multi-tenant schema migration for an HR SaaS and earn your verifiable certificate.
The scenario
The HR SaaS (around 60 percent gross margin, multi-tenant Postgres, 4 product squads) is preparing for a Series-C round — a botched migration would dent the 'enterprise-ready' narrative the round depends on.
The Brief
What you'll do, and what you'll demonstrate.
Migrate 11 tables across 3.4 TB of multi-tenant Postgres data with per-tenant cutover, zero downtime, and reversible at every phase.
Earning criteria — what you'll demonstrate
- Design a 4-phase expand-contract migration that is reversible at every step
- Backfill terabyte-scale tables without breaking replication lag SLOs
- Use shadow reads + feature flags to make cutover bounded and observable
- Document a migration playbook that the on-call team can run without authors
Program Fit
Where this fits in your program.
Sharpens the same skills your degree expects you to demonstrate.
Aligned coursework coming soon.
Skills
Skills you'll demonstrate.
Each one shows up on your verified credential.
- Multi Tenant Architecture
Apply multi tenant architecture to solve real industry problems and demonstrate production-level capability.
- Schema Migration
Apply schema migration to solve real industry problems and demonstrate production-level capability.
- Dual Write
Apply dual write to solve real industry problems and demonstrate production-level capability.
- Feature Flags
Apply feature flags to solve real industry problems and demonstrate production-level capability.
- Typescript
Write type-safe code that scales across large codebases and teams.
- Postgres
Apply postgres to solve real industry problems and demonstrate production-level capability.
Careers
Career paths this challenge builds toward
Completing this challenge demonstrates skills that transfer directly to these roles: