Product design question

Facebook is a multinational company with many offices around the world. Its employees are constantly traveling. Build a solution for FB employees travel.

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What this question tests

Internal tools product design: identifying friction in a business travel workflow for a company's own employees.

Identify the user: Facebook employees traveling frequently between offices for meetings, conferences, or cross-team collaboration.
Name pain points: fragmented booking across separate flight, hotel, and expense tools, plus difficulty coordinating with colleagues traveling to the same destination.
Propose a solution: a unified internal travel platform integrating booking, expense pre-approval, and a feature to see which colleagues are traveling to the same city at the same time, encouraging trip coordination.
Prioritize the booking and expense integration first, since that removes the most frequent daily friction, while colleague-coordination is a valuable secondary layer.
Define success as reduction in average time spent booking a trip and increase in expense report compliance and submission speed.

Names a genuinely differentiated feature, surfacing colleagues traveling to the same destination, which only makes sense as an internal, not consumer, tool.
Sequences priorities correctly, fixing the highest frequency pain (fragmented booking and expenses) before the nice-to-have coordination feature.
Picks a business-relevant metric, expense compliance speed, which matters to finance stakeholders for an internal tool.

Proposing a generic consumer travel app clone without addressing what is unique about internal employee travel needs.
Ignoring expense and compliance requirements, which are often the actual source of employee frustration with corporate travel tools.

How would you get buy-in from finance and legal for the expense integration?
How would you measure whether the colleague-coordination feature is actually used?