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IntermediateTECHNICAL
Walk me through how you typically design and implement a new feature for a web or backend service, starting from the requirements through to deployment. Please be specific about the languages, frameworks, and tools you usually use, and how you test your work.
Custom Role
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Sample Answer

Let me use a concrete example: adding a bulk user import feature to an internal admin tool. We were on a Node.js (TypeScript) backend with Express and PostgreSQL, and React on the frontend. I started by clarifying requirements with the PM and ops team: expected file size, formats, error tolerance, and audit needs. I sketched a simple sequence diagram and API contract in Swagger, then designed the data model changes and background job flow (Bull queue + Redis) to avoid blocking requests. Implementation-wise, I built the REST endpoint in Express, added validation with Zod, and wrote integration tests using Jest + Supertest plus unit tests around parsing and business rules. For the frontend, I added the upload UI in React with clear error reporting. We deployed via our CI/CD pipeline (GitHub Actions to Kubernetes), first to a staging environment, ran smoke tests, then did a canary rollout. The feature cut manual onboarding time by about 60% for the ops team.

Keywords

Starts with clarifying requirements and constraints with stakeholdersDesigns APIs and data flow before coding, using concrete tools (Swagger, diagrams)Uses TypeScript, Express, React, Jest, and CI/CD for implementation and testingEmphasizes measurable impact (e.g., 60% reduction in manual effort)
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