01
Server Components and the client boundary
Knowing what renders on the server, what ships to the browser, and how actions and transitions keep the UI responsive while data loads.
Senior / Staff
Hire senior React developers and frontend architects
React engineers who build accessible, fast interfaces and the component systems behind them — and who know which state belongs on the server, which in the URL, and which in the component.
Role profile
What we look for in a Senior React Developer
Seniority and experience are agreed in the proposal, and you interview every engineer before they start. These are the skills that interview should test.
02
Design system architecture
Accessible, token-driven components built on Radix primitives and Tailwind, documented well enough that other teams use them without asking.
03
State and cache discipline
Server data in TanStack Query, UI state kept local, shareable state in the URL — so components re-render only when they should.
Typical work
What a Senior React Developer typically works on
Examples of the scope this role is hired for. Your statement of work sets the actual deliverables and how they are accepted.
- 01Largest Contentful Paint and INP work, measured in field data before and after
- 02Accessible multi-step onboarding flows with validation and saved progress
- 03A component library with Storybook documentation and visual regression tests
- 04Real-time dashboards and collaborative views over WebSockets
Stack and tools
What this role works with day to day. Tell us your stack and we’ll say plainly which parts we can staff.
- React 19
- TypeScript
- Next.js
- Tailwind CSS
- TanStack Query
- Radix UI
Technology guides
Related service
Web & frontend developmentField Core Web Vitals measured before and after, and a replatform shipped route by route — while your team keeps releasing weekly.
How hiring works
Four steps, agreed in writing before anyone starts
01
Tell us the role
The stack, the seniority you need, the hours you want covered, and any certifications the work requires. We reply within one business day.
02
We propose engineers
A written proposal sets out who we'd put forward, their seniority and experience, the scope, and the terms. If we can't staff the role well, we say so.
03
You interview every engineer
Nobody starts on your codebase until you've interviewed them and agreed. Use the skills on the role page as your interview checklist.
04
Working arrangements go in the SOW
Working-hours overlap is agreed for each engagement and written into the statement of work — the shared window, who shifts hours, and how handoffs work outside it.
QuantmHill provides development teams from India for Indian startups and SMEs. Role profiles describe project capabilities; availability is confirmed for your engagement. Our team works on India Standard Time. Project working hours, availability and handoff responsibilities are agreed before kickoff.
Need specific certifications? Tell us at the start and we'll confirm whether we can staff to that requirement before you sign. There are no recruiting fees.
FAQ
Questions about hiring a Senior React Developer
Answered the way we would on a call. If yours isn’t here, send it — we reply within one business day.
The start date is agreed in the proposal, after you've interviewed the engineer. Ramp-up depends on your codebase and how quickly access is set up, so we plan the first week with you: environment, a small first ticket, and a reviewer on your side.
App Router experience is one of the things we look for in this role. If your codebase is still on the Pages Router, say so — the proposal states each engineer's experience with both, and the interview is your chance to test it.
Yes. The first job is to learn your tokens, component APIs and review process, not to replace them. Expect questions in week one and pull requests that follow your conventions.
Related roles
Similar and adjacent roles
Add a Senior React Developer to your team
Tell us the stack, the seniority you need and the hours you want covered. We reply within one business day, and you interview every engineer before they start.