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Migrate Monolith to Microservices

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Welcome to your interview.

The question is on your right: Migrate Monolith to Microservices. 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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Migration Challenge

You are the EM responsible for moving a legacy monolith to microservices without downtime. The system still powers live customer traffic, billing, and other critical workflows, so the migration has to preserve correctness while improving delivery speed.

Operating Constraints

team·6 backend, 2 frontend, 1 SREtraffic·8M requests/daydeadline·6 monthsdowntime·0 minuteslegacy_size·1.4M lines of code

Interview Prompt

Walk me through how you would migrate the monolith to microservices without downtime.