Own customer-facing backend features end-to-end at Brex's finance platform

Interview for a Senior Backend Software Engineer role on Brex's Product Engineering team, building customer-facing banking and spend-management features end-to-end. Expect a bar on backend system design, data modeling, and operability, plus close collaboration with Sales/Support to translate customer needs into shipped features.

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What this interview tests

Backend system design for scalable, customer-facing financial products
Data modeling with SQL/NoSQL databases
End-to-end ownership: from user experience through data models to operability and metrics
Cross-functional collaboration with Sales/Support to surface and prioritize customer needs
Code quality and engineering rigor in Java/Kotlin/Python

Common question themes

Design a scalable backend service for a specific Brex-like banking/spend feature

Walk through a backend system you owned end-to-end, including post-launch metrics and operability

How would you gather requirements from Sales/Support and turn them into a technical spec

Tradeoffs in choosing SQL vs NoSQL for a given data model

How do you 'tune and polish' a feature to a high quality bar before shipping

How candidates describe it

Real Senior Software Engineer interview stories — retold from candidates' public write-ups, with sources.

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