Pre-launch B2C mobile app, taken over from a previous team that had delivered code in poor condition before a brutal end of collaboration. The client absolutely had to hit a public launch date set 4 weeks later.
Full audit of a Flutter + NestJS codebase we hadn't written, identify what could be stabilized in 4 weeks versus what had to be deferred to V2, and ship a product that holds in production on D-day — without full rewrite.
Week 1: audit + debt mapping (architecture, tests, security, build, perf). Weeks 2-3: isolate the 3 critical paths (auth, payment, core feature), stabilize them with integration tests and Sentry monitoring. We accept assumed debt on secondary paths, documented in a README handed to the client. Week 4: deployment, continuous monitoring, handover.
Launch hit on the planned date. Application stable in production on critical paths. The client could take ownership of what came next with documented technical debt and a remediation plan.