Hire React developers in Ukraine
React and Next.js engineers employed by BigTree108 on Ukrainian contracts and embedded full time in your team. You interview them, you direct their work, and you own everything they write. The contracts, payroll, invoicing and leave stay with us.
Why this is not a marketplace
Most results for hiring React engineers in Ukraine are platforms that match you with a freelancer. That model is fine for short work and quietly expensive for long work, because everything around the person is missing.
An employee, not a rented profile
The engineer has a contract with a registered Ukrainian company, a notice period and colleagues. That is what makes leave cover, code review and a real handover possible at all.
Somebody reviews their work
Pull requests get a second pair of eyes from inside BigTree108, and architecture questions reach people who are not on your invoice. A lone contractor has neither.
A replacement you do not have to find
If a person leaves or is not working out, the replacement comes from a hiring pipeline we run continuously, with nineteen active technical interviewers on the team.
One contract and one invoice
You sign with BIG TREE 108 LLC. Ukrainian contracts, tax registration, declarations and payroll never reach your desk, and the hours behind the invoice are visible all month.
The stack we hire and interview for
React and Next.js
Single-page applications and server-rendered front ends, chosen by what the product needs rather than by what makes an engagement larger.
TypeScript throughout
Types at the boundaries rather than at the edges, so a response shape that changes breaks the build instead of a user session.
Design systems and accessibility
One implementation per interface pattern, with accessibility checked on each component rather than audited once before launch.
The backend beside it
ASP.NET Core on Azure is our largest practice and Python sits next to it, so the API your front end calls can come from the same team.
The front-end development service page covers React, Angular and Vue from the delivery side, for work you would hand over rather than staff.
React with the back end behind it
React engineers are a standing part of the team, working on client single-page applications and Next.js front ends, and they are interviewed by people who write front-end code. Our largest practice is ASP.NET Core on Azure, so a React front end and the .NET, Node.js or Python service behind it can come from one team that agrees the contract between them.
What travels between the two is the part that decides how a front end ages: typed API contracts generated from the backend rather than hand-written, one implementation per interface pattern instead of a drawer of near-duplicates, accessibility checked per component, and tests that run in continuous integration so a failing one blocks the release. Those rules are published on the services page and a change that breaks one does not merge.
Taking over a React codebase
Much of the React work that reaches us is an application somebody else wrote and left. That is a take-over, and this company has done nine of them, the oldest written in 2008. It starts with a read-only review and a written list of risks in order of production impact, before anyone changes a line, so you get a usable document even if you stop there.
The dedicated team page explains the engagement model in full. If Angular is the closer fit, there is a page for hiring Angular engineers.
Our record on Upwork
Where our client history is public and verified by the platform rather than written by us.
- Top Rated Plus
- Upwork status of the agency
- 100%
- job success score
- 50
- jobs completed through the agency
- 11,121
- hours worked for clients
Source: BigTree108 agency profile on Upwork, checked 4 September 2026
Questions about hiring React developers from Ukraine
How is this different from a freelance marketplace?
The engineer is an employee of a registered Ukrainian company with a contract, a notice period and colleagues, not a profile you rent by the hour. That changes the things that actually hurt on a long engagement: somebody covers their leave, somebody reviews their pull requests, and if they leave there is a handover and a replacement from a pipeline we run ourselves.
React or Next.js?
Both, and the honest answer depends on whether your pages need to be rendered on the server. We will tell you which one your product actually needs rather than the one that makes the engagement bigger, and we are equally willing to work in the framework you have already chosen.
Can a React engineer work on our existing codebase rather than a new one?
That is the normal case, and taking over code somebody else wrote is a large part of what this company does: nine such systems so far, the oldest written in 2008. It starts with a read-only review and a written list of risks in order of production impact, before anyone changes a line.
Do you cover the backend as well?
Yes, from the same team. ASP.NET Core on Azure is our largest practice and Python sits beside it for APIs, data work and AI agents, so the front end and the service it calls can be one engagement rather than two suppliers negotiating an API contract by email.
Who owns the code?
You do. Every specialist has signed a contract assigning all work product to BigTree108, and our agreement with you assigns it onward, so the chain from the person writing the code to your company is complete before any repository is opened.
What hours will a React engineer work?
Yours. Ukraine is one to two hours ahead of Western Europe so the whole day overlaps for EU and UK clients, and for North America we treat the schedule as a hiring requirement: we already have people running to European, Australian and US Pacific hours.
Need a React engineer?
Stack, seniority and working hours are enough to start. You get candidate profiles, or a search that produces them within two to three weeks.