IntermediateBEHAVIORAL
Think of a backend feature you implemented that required coordinating with a frontend or mobile team (for example, designing or changing an endpoint contract). Walk me through how you managed disagreements about data shapes, validation rules, or error handling, and how you ensured everyone stayed aligned through release.
Backend Developer
General

Sample Answer

On a recent project, I owned the backend for a new onboarding flow used by both web and mobile. The mobile team wanted one big “god” endpoint to reduce round trips, while frontend preferred smaller, more granular endpoints. I was worried that a mega-payload would be brittle and hard to evolve. I pulled everyone into a 45‑minute API design session and came with concrete examples: sample payloads, error responses, and a simple sequence diagram. We aligned on 3 focused endpoints with a shared, versioned response schema and a consistent error envelope (`code`, `message`, `fieldErrors`). I added OpenAPI docs, mocked responses in Postman, and a contract test suite that ran in CI. During rollout, we did a behind‑feature‑flag deploy and monitored logs and client error rates. We shipped on time, kept mobile network calls down by ~30%, and had zero contract-related production bugs in the first month.

Keywords

Hosted a structured cross-team API design session with concrete examplesCompromised on 3 focused endpoints plus a shared, versioned schemaStandardized error envelope and added contract tests in CIFeature-flagged rollout with monitoring to ensure a smooth release
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