Migrations
Code migrations that ship instead of stall.
Zerg handles mechanical transformations, type migrations, dependency upgrades, and architecture refactors with tests and review checkpoints attached.
Evidence
24 days
production JavaScript to TypeScript migration
batch PRs
reviewable changes instead of one risky rewrite
tests first
validation loop drives the migration plan
The problem
The hard part is the interface between systems.
Migration work usually sits between “too boring for senior engineers” and “too risky to outsource.” It drags because every edge case needs context.
What we deploy
A loop that can keep operating after delivery.
- 01
Ingest the repo, dependency graph, target architecture, lint/type rules, and acceptance tests.
- 02
Generate small verified batches of changes, preserve reviewability, and use failing checks as the next work queue.
- 03
Leave behind migration harnesses and rules so future repos can move through the same path faster.
Who this is for
Engineering leaders with large maintenance backlogs, platform teams modernizing shared code, and teams blocked by legacy surface area.
Surface area
Migrations