Taking over an existing software project starts with reducing uncertainty. The first month should make the system buildable, observable and safe enough to change. It should not become a rushed feature sprint.
When this plan applies
Use this plan when ownership changed, documentation is incomplete, production incidents are recurring, or the previous team left without a reliable handover. If access is still missing, resolve that before promising delivery dates.
Days 1-5: secure access and recovery options
Inventory repositories, hosting, DNS, databases, object storage, queues, analytics and third-party accounts. Record the owner and recovery path for every critical account. Create restorable backups before changing production settings.
Days 6-12: reproduce the current system
Build the application in an isolated environment. Record runtime versions, dependencies, environment assumptions and deployment steps. A system that only works on one server has a delivery risk before it has a feature backlog.
Days 13-20: map critical workflows
Trace the workflows that affect money, access, orders, inventory or data loss. For each workflow, identify inputs, state changes, external dependencies, failure signals and the person who owns the decision.
Days 21-30: define the first stabilisation milestone
Choose one operational outcome: repeatable deployment, safe payment callbacks, reliable background jobs or a recoverable inventory flow. Write acceptance evidence before implementation starts.
Common failure mode
Do not combine a framework migration, infrastructure move and new feature release in the first milestone. When everything changes together, the team loses the evidence needed to explain a regression.
Next decision
The review should end with a system map, risk register, access gaps, tested workflow list and a bounded first milestone. That is enough evidence to estimate responsibly.
Related services
For a structured takeover and recovery plan, see Existing Project Rescue & Stabilisation.