Principal, Fraud Technology
Posted Sep 3, 2026 · We last checked this listing on Oct 6, 2026
Likely interview questions for this role
Written from this job description, not a generic list. Each one notes what the interviewer is really checking.
About your past
Tell me about a performance problem you found in a Spring Boot service and how you fixed it.
What they are checking: Whether they have real experience monitoring and tuning Java services.
Describe a time you worked with product owners to clarify unclear requirements.
What they are checking: Whether they can shape requirements with cross-functional teams before building.
What would you do
The fraud team wants a new rule live tomorrow to stop an active attack. How do you handle it?
What they are checking: Whether they can move fast in an emergency while still testing enough to avoid blocking good customers.
A downstream team keeps calling your API in a way that overloads it. What do you do?
What they are checking: Whether they protect the service with limits and also work with the other team on a lasting fix.
About the work
How would you design an API that scores a payment for fraud in real time?
What they are checking: Whether they can design for low latency, reliability and safe fallback when the fraud check is slow.
What happens to a payment if your fraud service is down? How would you design for that?
What they are checking: Whether they think through failure modes and the business trade-off between blocking and allowing.
How do you secure APIs and microservices that handle sensitive financial data?
What they are checking: Whether they apply authentication, authorization and data protection in depth with tools like OAuth and encryption.
How do you keep each microservice focused on a single responsibility as the system grows?
What they are checking: Whether they maintain clear service boundaries instead of letting services grow into tangled dependencies.
How would you work with QA and DevOps to make sure releases do not break fraud detection?
What they are checking: Whether they build testing and deployment practices that protect a critical control.
How would you log and monitor a fraud system so you can explain any decision later?
What they are checking: Whether they design for traceability, which fraud investigations and audits depend on.
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As published by Northern Trust.