IntermediatePROBLEM_SOLVING
Describe a situation where you refactored legacy frontend code. What were the main issues you found (e.g., performance, maintainability, architecture), and what concrete changes did you implement to improve the codebase?
Frontend Developer
General

Sample Answer

At my last company, I inherited a 6-year-old React codebase powering an internal tool used by ~300 support reps. Pages were taking 8–10 seconds to load and any small change felt risky. Everything lived in two giant components, over 1,500 lines each, with inline business logic and copy-pasted API calls. I started by adding tests around the most-used flows and setting a baseline: average load time, bundle size, and error rate. Then I broke the monolith components into smaller, presentational/containers, pulled all API calls into a shared `services` layer, and introduced a simple state management pattern with React Query. I also converted the worst-performing table to virtualized rendering and removed some redundant data fetching. Within about six weeks, we cut initial bundle size by ~30%, dropped median load time from 9s to ~3.5s, and reduced front-end error logs by roughly 40%. The support lead told us tickets related to UI glitches basically disappeared.

Keywords

Identified concrete legacy issues: giant components, duplicated logic, slow loadsAdded tests and performance baselines before refactoringModularized components and centralized data fetching/state managementDemonstrated measurable improvements in load time, bundle size, and errors
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