Top 4 Business case Interview Questions
Browse 4 real-world technical and behavioral interview questions about Business case. Review scenarios, edge cases, and architectural best practices.
Build or buy an internal developer platform: build the total-cost comparison.
Compare total cost of ownership like for like. Buying still needs a platform team, building never ends at launch, and a later launch delays benefit. On illustrative figures for 300 engineers over three years, buying costs 1,595k against 2,775k to build, and building wins at steady state only above about 900 engineers.
Live case: you have thirty minutes to present a business case for migrating our monolith. Take us through the options, the sequence, the risks and how we would know it worked.
A monolith migration business case compares options in one unit finance can convert, shows the payback with stated assumptions, and names the number that would change the answer. Worked here, modularising in place pays back in about eighteen months; extracting services is a staged option decided on measured evidence.
Finance asks what the platform team returns for what it costs. How do you show it without inflating the number?
Show platform ROI against a counterfactual cost: what product teams would spend doing the work themselves, measured from non-adopters. Add measured time saved, discounted because hours are capacity not cash, and consolidated licences. Report reliability separately and state the limits.
How do you make the case for headcount or a platform investment, and what do you do about a stakeholder who keeps going around you?
Ask for an outcome rather than for people, price the status quo in the currency the decider uses, and pre-wire the case before the forum. When someone bypasses you, treat it as evidence your intake is too slow rather than as an authority problem, and fix the front door first.