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Build vs Buy Decision Framework

MediumStrategy00:00
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Welcome to your interview.

The question is on your right: Build vs Buy Decision Framework. Take a moment with it first.

Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.

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Problem

Scenario

You're advising an engineering leader who needs to choose between building a capability internally or adopting an enterprise product. The decision affects delivery speed, long term flexibility, integration with existing systems, and total cost over time. Leadership wants a clear way to make this call consistently across areas like recruiter workflows, candidate engagement, and internal platforms.

Question

How do you decide when to build a solution in-house versus buying an off-the-shelf enterprise product?

What this tests

  • Ability to separate strategic differentiation from commodity functionality
  • Comfort with trade-off analysis across speed, cost, fit, and control
  • Use of KPI-driven reasoning rather than opinion
  • Ability to estimate multi-year economics and opportunity cost

Representative context

Build option·9 months to launch, $1.8M year one, $500K annual maintenance, 95% long-term fitVendor option·4 months to launch, $1.2M year one, $900K annual run cost, 75% requirement fitRepresentative capability·Candidate communications and workflow orchestration near Allegis Group recruiting systems