decision making

The services-and-enterprise interview staple. There is a defensible answer and it is not 'always re-platform': the decision is a function of change tolerance, deadline reality and what the workload is worth.

Defend a change with irreversible effects by separating code rollback, data recovery and external correction, with explicit recovery objectives and tested limits.

Decide whether to continue a migration using remaining costs and current benefits, then deliberately operate or unwind the partial state.

Assess a signed vendor choice against the actual requirements and contract, then support a bounded implementation or raise material new evidence through its owners.