From monolith to modular: a six-month migration that didn't burn out the team
Migration projects fail when they're treated as parallel work. A field guide to incremental architecture migrations that ship value every two weeks without grinding the team into dust.
Why migrations fail
Most migrations fail because the team tries to run them parallel to feature work. Half a team on each, both moving slower, neither finishing. Six months in, leadership cancels the migration and the technical debt compounds.
The strangler-fig done right
Pick one bounded context. Extract it. Ship it. Repeat. Each extraction has to deliver value on its own — a faster page, a cleaner API, a feature that was blocked. If the only payoff is 'we'll be glad we did this later', momentum dies.
What to protect
Team morale, deploy cadence, and feature velocity. If any of those drop, pause and redesign the migration. A migration that ships nothing for a quarter is a migration that gets cancelled.
Pacing
Two-week extractions. Demo every Friday. Migrate one bounded context per month. By month six, the monolith is a thin shell and the new architecture is paying for itself.
Migrations are won on the boring metric of sustained velocity. Protect that and you'll finish.