AReactdevelopment company for products that need to scale.

Senior React and Next.js engineers build your app from scratch, join your team or take over a codebase that has become hard to change. You interview everyone who works on your product.
Talk to React engineers

React is easy to start. Hard to scale well.

Any team can get a React app running in a day. Keeping it fast, consistent and easy to change after years of features is a different job: a clear state strategy, a component library, typed APIs and tests people trust. That's the part we're usually hired for.

Where React projects go wrong

01

State management sprawl

Global stores, context and local state get mixed until nobody knows where a piece of data comes from.
02

Rerenders slow everything down

Large lists and forms lag because components rerender far more often than they need to.
03

Copy-pasted components

Ten versions of the same button and modal turn every design change into a search party.
04

SEO suffers on a client-only app

Search engines and link previews see an empty page because everything renders in the browser.
05

Upgrades keep getting postponed

Old React versions, class components and stale libraries pile up until an upgrade feels like a rewrite.
06

React hiring takes months

Senior React and Next.js developers get several offers at once, and your roadmap can't wait.

Signs you need a React team

If two or more of these sound familiar, outside React expertise will pay off quickly.

1

Every feature touches too many files

Small UI changes require edits across components, stores and styles.

2

The app is slow on real devices

It's fine on a developer laptop, but customers on phones notice the lag.

3

Your pages need SEO

You need server rendering or static pages, and the current setup can't provide them.

4

The original developers are gone

Nobody left fully understands the codebase or why it was built this way.

5

You want mobile apps too

You'd like to reuse React skills and logic for iOS and Android.

6

Your React hires keep falling through

Candidates accept other offers and the roles stay open.

What we do

React and Next.js development services

Custom React applications

SaaS products, dashboards and portals built in React and TypeScript from scratch.

Next.js development

Server rendering, static pages and API routes for fast, search-friendly products.

Upgrades and migrations

Moves from class components, older React versions or other frameworks to current React and Next.js.

Performance tuning

Profiling, memoization, code splitting and rendering fixes for slow screens.

Component libraries

Shared, documented React components that keep every screen consistent.

React Native apps

iOS and Android apps that reuse your team's React skills and part of your logic.

Dedicated React teams

A React team with its own lead, QA and project management for a product or workstream.

React staff augmentation

React engineers who join your sprints, your tools and your code review.

Our React ecosystem

The tools we use most, picked for long-term maintenance rather than trends.

React
Next.js
TypeScript
JavaScript
Redux
Node.js
NestJS
PostgreSQL
AWS
GitHub Actions
Who is this for

For teams building on React

Startups

You need a React app built fast, by people who won't leave a mess for your next hires.

Product companies

Your React codebase keeps growing, and you need more senior hands or a second team.

SMBs

You need one or two React developers for the long run, without an internal hiring process.

Agencies

You sold a React or Next.js project and need engineers to deliver it under your brand.

What do you need from React engineers?

Build a new app

From an idea or designs to a production React app.

Add capacity

React engineers who join your existing team.

Fix performance

Find and remove what slows your app down.

Upgrade the stack

Current React, Next.js and TypeScript, step by step.

Take over a codebase

Continue a product another team started.

Go mobile

React Native apps next to your web app.

How we start a React engagement

01

Intro call

We discuss your product, your codebase and whether you need a project, a dedicated team or extra engineers.

02

Code or scope review

For an existing app we review the code. For a new one we define scope and architecture.

03

Team selection

You get profiles of React engineers matched to your needs and interview them yourself.

04

First sprint

Engineers set up access, learn the codebase and ship real tasks in the first sprint.

05

Ongoing delivery

Regular demos, code review and reports. The team scales up or down with your roadmap.

How we work

Choose your React engagement

React staff augmentation

React engineers inside your team

Monthly, per engineer. Scale up or down.

For teams with their own technical lead who need more React capacity.

Senior React and Next.js engineers

You interview and choose

Your process and tools

Replacement if someone isn't a fit

Start in about two weeks

Add React engineers

Dedicated React team

most popular

React engineers with a lead, QA and a PM

Monthly, team-based.

When you want to hire a dedicated team for React app development and hand over a product or workstream.

Team lead and React engineers

QA and project management included

Sprint demos and progress reports

Clear code and architecture ownership

Hand-over when you're ready

Build a React team

Web products we've built

SaaS

Magmaset: one tool for all project tasks

Read the case study →
AI Commerce PlatformE

QLode

USA
Europe

An AI-powered fashion commerce platform that helps retailers deliver personalized shopping experiences through virtual styling, AI recommendations, image search, and intelligent product discovery.

Before
→
after
↓
AI search didn't scale
↑
AI-based recommendation engine developed
↓
Scalable infrastructure needed
↑
Image & text search implemented
↓
Complex retailer integrations
↑
Multi-retailer integration architecture built
↓
Product discovery wasn't production-ready
↑
High-performance backend for AI-driven flows
E-commerce · AI

Taking an AI-built e-commerce SEO platform to production

Read the case study →

Make the most of the experienced team

We are a global team of
creative
and
strategic thinkers
who specialize in building custom digital products
from scratch. Our main goal is to
deliver high-quality solutions
that meet our clients' needs.
We are a global team of
creative
and
strategic thinkers
who specialize
in building custom digital products
from scratch. Our main goal is to
deliver high-quality solutions
that
meet our clients' needs.
Learn more
85%
recurring customers
12M
the biggest fundraising round by one startup
X3 MRR
growth of partner's business in 5 mos
2 weeks
for project start
5+ years
av. partnership duration with SMBs and product companies

Why Gilzor

We're a React and Next.js development company that builds whole products, not just components. Our React engineers work next to designers, back end developers and QA, so your app is built as part of a working product.

What we bring

Fast start

React engineers can start in about two weeks.

You choose the people

You interview every engineer before they join.

Long partnerships

Average partnership with SMBs and product companies is 5+ years.

Web and mobile

React for the web, React Native for iOS and Android.

Delivery record

70+ products launched, 98% delivered on time.

What makes us different

Maintainability first

Typed, tested code with a clear state strategy.

Senior code review

Every pull request is reviewed before it's merged.

Honest about rewrites

We prefer gradual upgrades over big-bang rewrites whenever they work.

Flexible setup

Move between augmentation and a dedicated team as your needs change.

Overlap with US hours

Our engineers in Europe overlap with part of the US working day.

What our clients
frequently ask

Can React developers join our existing team?

Yes. Our React engineers join your sprints, tools and code review and take tasks from your backlog. You interview each of them first, and they report to your tech lead.

What does a ReactJS development dedicated team include?

Usually React engineers, a team lead, a QA engineer and a project manager, with designers or back end developers added when needed. The team owns delivery and keeps you updated through demos and progress reports.

Should we use Next.js or plain React?

Next.js suits products that need SEO, fast first loads or server-side logic. A plain React app with a separate API can be simpler for internal tools and dashboards. We recommend one after looking at your product.

Can you take over our existing React codebase?

Yes. We start with a code review, document what we find and fix the riskiest parts first. Then we continue feature work while improving the codebase step by step.

Do you also build React Native apps?

Yes. If you need iOS and Android apps, React Native lets us reuse React skills and part of the logic from your web app.

How fast can React engineers start?

Usually in about two weeks: profiles within a few days, interviews on your side, then onboarding. Timing depends on the seniority and number of engineers you need.

How is React development priced?

Augmented engineers and dedicated teams are billed monthly. Fixed-scope projects get a fixed price after discovery. Tell us what you need and we'll share an estimate.

No sales pitch

Tell us about your React project

Share where your codebase stands, your roadmap and the help you need. We'll come back with engineer profiles or a plan, and an estimate. If we're not the right fit, we'll say so.

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