IntermediateBEHAVIORAL
Describe a situation where a backend API change unexpectedly broke your frontend in production. How did you detect the issue, communicate with the backend team, and what concrete frontend-side safeguards (e.g., types, runtime checks, feature flags, fallbacks) did you put in place to prevent similar incidents?
Frontend Developer
General

Sample Answer

At my previous company, a backend team removed an optional field from a /user/profile endpoint, which caused our React dashboard (TypeScript) to crash for ~8% of users right after a Friday deploy. I detected it via a spike in Sentry errors and a 12% drop in conversion in Datadog dashboards. My task was to restore stability quickly and prevent similar regressions. I hotfixed the UI in 30 minutes by adding null-safe access, default values, and a graceful fallback component. Then I added stricter TypeScript interfaces aligned with OpenAPI, plus lightweight runtime validation using Zod to guard critical responses. We also introduced contract tests in CI and a feature flag to roll back API-dependent UI changes. Result: MTTR dropped by 60%, and we had zero similar API-contract incidents over the next 9 months.

Keywords

Used observability tools (Sentry, Datadog) to quickly detect and quantify impactImplemented TypeScript + Zod runtime validation to harden against API contract changesAdded graceful fallbacks and null-safe access to avoid hard crashesCollaborated on contract tests and feature flags, reducing similar incidents to zero
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