Zero-Downtime Database Migration Platform

Why this project

Migration strategy is a top staff/architect topic. Shows you have shipped real production changes safely.

Tech stack

Skills demonstrated

• Expand-contract migrations
• Dual-write pattern
• Data verification
• Rollback planning

Interview talking points

• Expand-contract example on a real table
• Dual-write consistency window
• When to stop and rollback
• Team coordination during migration

Problem statement

Tooling and runbooks to migrate from monolith DB to service-owned DBs using expand-contract, dual-write, and verification jobs — demonstrated on a sample schema split.