React problems new hires hit in the first 90 days
The hard part of a new React job is rarely JSX. It is the decisions the team made before you arrived: where state lives, how data is fetched and cached, and which patterns reviewers will reject.
- Hooks: useEffect dependency arrays that cause infinite loops, stale closures in event handlers, and "Too many re-renders" errors.
- State: Redux Toolkit slices, Zustand stores and React Context all in the same app, with no clear rule for which to use.
- Data fetching: React Query or SWR cache keys that do not invalidate, duplicate requests, and loading states that flicker.
- Next.js: "Hydration failed because the initial UI does not match", server versus client components, and environment variables that are undefined in the browser.
- Lists and keys: the unique key warning, and bugs caused by using an array index as key.
- Testing: React Testing Library queries that cannot find elements, act() warnings, and mocked modules that leak between Jest or Vitest tests.
Design systems, performance and reviews
Most product teams wrap a component library such as MUI, Chakra or an in-house system built on Tailwind. Job Support helps you find the right existing component instead of building a duplicate, and understand the props and theming conventions reviewers expect.
Performance tickets come early too. You can work through React DevTools Profiler output, decide whether memo, useMemo or useCallback actually helps, and spot an expensive context provider re-rendering the whole tree.
What a React support session looks like
Kavya joins a Hyderabad startup building a dashboard for US customers. Her filter panel triggers a request loop. In a Job Support session she shares the component and the network tab pattern, sees that an object literal in the dependency array changes every render, moves it into useMemo, and adds a test that asserts a single fetch.
In the next morning's Google Meet code review, the live transcript helps her follow a senior engineer's comments about lifting state, and she replies with her own reasoning.
Using React job support responsibly
Job Support exists to help you learn faster and do your own work well, not to have someone else do it.
- Follow your employer's rules on sharing source code and screenshots of internal products.
- Remove API keys, auth tokens and customer data from code, .env files and network logs before sharing.
- Never share GitHub, Vercel, cloud or SSO credentials.
- Write and commit your own changes, and be able to explain them in review.
React job support pricing and how to start
Job Support costs $5 per hour including taxes. Each hour includes 200 AI credits and support, and hours and credits never expire. Pay through Stripe or bank transfer. Refunds are available only if the tool does not work.
Try it free first: 5 live Copilot minutes and 100 AI credits, no card needed. The desktop app runs on Windows and macOS and works alongside your editor and browser.