Hire React Developers Who Work Inside the Codebase You Already Have
You do not need a new application built. You need somebody who can open a component nobody has touched in eight months, work out why it re-renders, and fix it without breaking the three screens that import it. That is the developer we send.
- 2–3 profiles in 3 business days
- You interview and you choose
- Replacement free inside two weeks
What a React Developer Does Between Standups
Very little of the week is writing new components. Most of it is reading existing ones: finding which of four similarly named files the route actually renders, working out which prop is load-bearing, and deciding whether the safe change is the small one or the one that removes the reason the bug existed at all.
The rest is the unglamorous middle of frontend work. Wiring a screen to an endpoint and handling the three states everyone forgets — empty, loading again after a refetch, and failed halfway through. Making a form behave when the network is slow. Keeping a table usable at a thousand rows. Reading a design and asking the question that saves a week, which is usually about what happens when the text is longer than the mockup.
They join your standup, take tickets off your board and put pull requests into your review queue. You brief them yourself. There is no account manager in between, because that layer only ever adds a day and loses the detail that mattered.
How hiring works, step by stepSix Judgements That Separate Seniority in React
Everyone on a shortlist can build a component. These are the calls that tell you which of them has maintained one for two years.
Component Boundaries
A junior splits a component when the file feels long. A senior splits where the data or the reason to change actually divides, and merges two components back into one when the split existed only to look tidy. The tell is a component with eleven props, seven of which are passed straight through to a child.
Context Versus a Store
Context is a way to avoid threading props through six layers, not a state manager. Put a value that changes on every keystroke into a context near the root and everything beneath it renders. A senior developer separates rarely changing context — theme, current user, locale — from hot state, and reaches for a store or a colocated hook for the latter.
Memoisation That Earns Its Keep
Wrapping every value in a memo hook costs allocations and comparisons and usually buys nothing, because the child was cheap or the dependency array was rebuilt on every render anyway. A senior developer measures first, memoises the genuinely expensive computation or the reference feeding a memoised child, and leaves the rest alone. Cargo-culted memoisation is the most common thing we see in review tasks.
When an Effect Is the Wrong Tool
Most effects worth deleting were derived state that could have been computed during render, or a reaction to a user action that belonged in the event handler. Effects are for synchronising with something outside React: a subscription, a timer, a DOM measurement, a request whose lifetime is tied to the component. Anyone who reaches for an effect to keep two pieces of state in agreement will keep writing bugs that only appear on the second render.
Lists at Real Volume
A grid that is fine with the fifty rows on staging becomes unusable with the eleven thousand a real account has. Virtualisation is the fix and it brings its own bill: variable row heights, sticky headers, keyboard navigation, browser find-in-page, and accessibility for rows that are not in the DOM. A senior developer knows those costs before adopting it, and knows that pagination is often the better answer.
Suspense and Error Boundaries
Where the boundaries sit decides what a user sees when one panel fails: a blank screen, or a dashboard with one broken card and everything else still working. Seniority shows in choosing that granularity deliberately, giving a boundary a way to retry rather than only apologise, and making sure the error reaches your monitoring instead of a console nobody reads.
More on the surrounding tooling in the React ecosystem, and on server rendering in hiring Next.js developers.
What We Put React Candidates Through
Real production scenarios, not trivia about lifecycle methods nobody has written since class components.
A broken application, running, with the bug already in it
A list that re-renders the whole page on every keystroke in the filter box. A request that fires twice and creates a duplicate record. A modal that keeps stale props after it reopens. The candidate shares a screen and debugs it live, and we watch the order in which they check things — which is far more informative than whether they land the fix inside the hour.
A pull request full of plausible mistakes
We ask for a review of a diff containing a memo that cannot possibly help, a dependency array that silently drops a value, and a key derived from the array index on a list that reorders. Catching all three is good. Explaining them to a colleague without being unpleasant about it is what we are actually scoring.
A design conversation with no clean answer
How would you split this screen into components, where does the state live, what happens when the API is slow, and what would you do differently knowing the page will be rebuilt in six months anyway. We are listening for the trade-off they refuse to make, and the reason.
Reading unfamiliar code under time pressure
A repository they have never seen and a small feature request. Nobody finishes comfortably. What we learn is whether they explore before they edit, whether they follow the conventions already in the file, and whether they say out loud when they are lost instead of quietly guessing.
What a Good React Brief Looks Like
Ten minutes of specifics beats a two-page job description. This is the shape we can act on the same day.
Tell us this
- What the application is, and roughly how old the frontend is
- Router, build tool, styling approach and data layer as they exist today, warts included
- Whether there is TypeScript, and whether strict mode is genuinely on
- Test coverage in honest terms — none is a perfectly acceptable answer
- The first three tickets you would hand them in week one
- Hours of overlap you need, and which time zone that is anchored to
- Part-time, full-time or a fixed piece of work, and for roughly how long
Skip this
- A list of fifteen libraries where two are load-bearing and thirteen are in the lock file
- Year counts as a proxy for skill — say what the person has to be able to do instead
- Culture paragraphs that would describe every company that has ever written one
- Unqualified seniority. Senior for whom, deciding what, with how little supervision
- Anything you would not repeat to the developer directly, since you will be briefing them yourself
What a React Developer Covers, and What They Do Not
The most common disappointment in frontend hiring is a scope assumption nobody said out loud. Here it is, said out loud.
Everything from the API response to the pixel
Components, routing, forms and validation, client-side fetching and caching, rendering performance, accessibility of what they build, component tests, and the review comments that stop the next person repeating a mistake.
Visual design
A React developer implements a design faithfully and will tell you where it breaks at 320 pixels or with real content in it. They are not a substitute for a designer, and asking them to invent the interface as they go produces exactly what you would expect.
Backend and database ownership
They integrate with your API and argue for a better shape of response. They do not own schema design, query performance, background jobs or server-side auth. That is a Node developer or a full-stack developer.
Build pipeline and deployment
Plenty of our React developers are comfortable in a CI configuration and a bundler config, and some have owned a frontend deploy end to end. Treat it as something to confirm in your interview rather than assume, and say so in the brief if it matters.
You Probably Do Not Need a React Developer If
The First Three Weeks, Realistically
Access and a Small Ticket
Repository, environment, board, review queue. The first pull request should be small and real, because a merged change on day two teaches more than a week of reading documentation.
Conventions Before Opinions
They follow what is already there, even where they would have done it differently. Suggestions about your architecture belong in week four, once they have earned the right to have one.
Normal Throughput
By the second or third week they are taking tickets at the rate your own team does, and you can judge them the way you judge everyone else.
Your Call Either Way
If it is not working, tell us inside the first fortnight and we replace them at no cost. Saying what specifically was wrong is what makes the next profile better rather than merely different.
Rates per developer per month and per hour are on the pricing page. Every role we staff is listed under services.
Hiring React Developers
Can a React developer work in our existing codebase rather than starting something new?
That is the normal case and it is what we vet for. During assessment a candidate is dropped into a codebase they have never seen and asked to make a change in it, because reading code written by other people is most of the job. Expect a first week of small, low-risk pull requests while they learn your conventions, then normal ticket throughput from the second week.
Do your React developers also do backend work?
Not unless you asked for a full-stack developer. A React developer will consume your API, push back on its shape and own the client-side data layer around it, but they will not own your database schema, your infrastructure or your deploys. If you need one person across both, hire a full-stack developer instead, and read the caveats on that page before you do.
Which state management library do your React developers use?
Whichever one you already use. A developer who spends the second week migrating your application to their preferred store is a cost, not a benefit. On new work most of them keep server data in a caching layer built for it and keep genuine client state small, because a large share of what teams put in a global store turns out to be cached server responses with extra steps.
How do you test React skill without whiteboard puzzles?
We hand candidates a running application with real defects in it: a list that re-renders everything on every keystroke, an effect that fires twice and duplicates a request, a form that drops characters under fast typing. They debug it live and narrate what they are doing. We also ask them to review a pull request containing a plausible but useless memoisation, and we watch whether they catch it and how they word the comment.
What seniority should we ask for?
If you already have senior engineers and need throughput on well-specified tickets, mid-level is usually better value. Ask for senior when somebody has to make calls without supervision: drawing component and route boundaries in a large application, choosing a rendering and data-fetching strategy, or untangling a state layer that grew without a plan. Paying senior rates for ticket throughput is the most common overspend we see.
How quickly can a React developer start?
Two or three vetted profiles within three business days, then your own interviews. Most engagements begin one to two weeks after that, which is mostly interview scheduling and notice periods rather than anything on our side. If the developer is not the right fit, we replace them at no cost inside the first two weeks.
Send Us the React Role
The stack as it really is, the first three tickets and the overlap you need. Two or three profiles come back within three business days.