IntermediateBEHAVIORAL
Tell me about a time you inherited a legacy frontend codebase with no documentation. How did you get oriented, decide what to refactor first, and communicate trade-offs to your team?
Frontend Developer
General

Sample Answer

At a fintech startup, I inherited a 6-year-old AngularJS dashboard with zero docs and frequent production bugs (20–30 / month). Situation: onboarding new features took weeks due to fear of breaking things. Task: stabilize the codebase and enable faster delivery without a risky full rewrite. Action: I first mapped critical user flows using Chrome DevTools + Lighthouse, then generated a dependency graph with Webpack Bundle Analyzer and drew a high-level architecture in Miro. I wrote smoke tests with Cypress for top 5 revenue-critical flows, then refactored the worst pain points: shared state and duplicated API calls, introducing a small Redux slice and a typed API layer in TypeScript. Result: reduced critical bugs by 60%, improved build time by 35%, and cut feature cycle time from 10 to 6 days, while giving leadership a phased migration plan instead of a big-bang rewrite.

Keywords

Created quick architecture map and smoke tests before touching logicPrioritized refactors by business impact and bug frequencyIntroduced incremental TypeScript + state management, not a full rewriteQuantified improvements in bugs, build time, and delivery speed
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