Senior Scala Engineer (Hybrid)
Posted Aug 17, 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 back-end service you built in Scala. What design choices are you most proud of?
What they are checking: Real depth in Scala and the ability to explain design tradeoffs, not just list features.
Tell me about a code review where you strongly disagreed with someone. How did it end?
What they are checking: Whether they can argue on technical merit and still keep a working relationship.
Tell me about a time you improved a legacy system rather than rewriting it.
What they are checking: Judgment about incremental improvement versus costly rewrites in a long-running business.
What would you do
A feature you shipped is causing slow responses for restaurant partners at lunch peak. Walk me through how you find the cause.
What they are checking: A calm, methodical debugging approach using metrics and logs rather than guessing.
You are working with front-end engineers who need an endpoint changed this sprint, but the change risks other clients. What do you do?
What they are checking: Whether they protect existing consumers while still unblocking teammates.
About the work
How do you use Scala's type system to prevent bugs before they reach production?
What they are checking: Whether they use types, case classes and pattern matching on purpose to make bad states impossible.
Our management portal and dining platform serve millions of users and thousands of restaurant partners. How would you design an API that both sides rely on?
What they are checking: Thinking about versioning, permissions and reliability when two very different user groups depend on one system.
How do you handle concurrency and side effects in Scala? Which libraries or patterns do you prefer?
What they are checking: Comfort with functional effect systems or futures and an understanding of why they matter.
How do you keep a back-end system secure when it handles financial and personal data?
What they are checking: Awareness of authentication, input validation and data protection as part of everyday coding.
How do you decide when to write tests, and what kinds of tests matter most for a service like this?
What they are checking: A practical testing strategy that balances confidence with speed of delivery.
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Practice this out loudThe full job description
As published by Rewards Network.