Taking over a live web application is an exercise in reducing unknowns. The first month should establish access, ownership, operational visibility, critical risks, and a realistic order of work before major changes begin — not because caution is an end in itself, but because changing a system you do not yet understand is how continuity gets broken.
Before day one: define handover owners and protect business continuity
Before any technical review begins, agree who is responsible for the handover on both sides, and confirm that the current system keeps running without disruption during the transition. A handover with no named owner tends to lose momentum exactly when clarity matters most.
A phased first 30 days
- Days 1–5. Confirm code repository access, hosting and infrastructure accounts, domain and DNS control, and third-party service logins. Nothing meaningful can be reviewed without this access in hand.
- Days 1–10. Map the application architecture, the environments in use, how deployments happen, where data lives, and which integrations the product depends on.
- Days 5–15. Review existing monitoring and backups, past incident history, key dependencies, and any known issues the previous team can document before context is lost.
- Days 10–20. Build an understanding of the critical user journeys, current support workflows, and what carries the most release risk if something changes.
- Days 15–25. Turn the findings so far into a prioritized risk and stabilization backlog — what needs attention first, and why.
- Days 20–30. Agree responsibilities going forward, define the ongoing maintenance scope, and set the first concrete delivery plan.
What not to do in the first 30 days
Do not promise a rewrite before the current system is actually understood
Do not change production configuration or infrastructure without a tested rollback path
Do not rely on one person's undocumented knowledge as the only record of how the system works
Do not assume every inherited system needs the same depth of review — scale the process to actual complexity
What a useful 30-day output should contain
At the end of the review, there should be a clear record of what access and documentation exist, a prioritized list of risks with enough detail to act on, an understanding of the critical journeys that cannot fail, and an agreed plan for ongoing responsibility. Where the backlog surfaces significant gaps in test coverage or areas that need real feature work rather than stabilization, that should be flagged separately as a distinct, scoped development effort rather than folded quietly into day-to-day support.
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