AReact Nativedevelopment company for apps that need to grow, on iOS and Android.

We build new React Native apps, take over existing ones and add React Native engineers to in-house teams. One TypeScript codebase, native skills where the app needs them.
Talk to our team

React Native is easy to start. Keeping it fast and current is the hard part.

Many React Native apps begin quickly and then slow down: library versions drift, the bridge to native code gets messy and every upgrade feels risky. We build React Native apps with a clean structure, typed code and a plan for upgrades, so the app stays easy to change years after launch.

Common problems in React Native projects

01

Upgrades nobody wants to start

The app is several React Native versions behind and each library update breaks something else.
02

Abandoned third-party libraries

Key packages are no longer maintained and block upgrades or new OS support.
03

Slow screens and long startup

Heavy re-renders, large bundles and long lists make the app feel sluggish on mid-range phones.
04

Native code nobody understands

Custom Swift or Kotlin modules were written by someone who left, and nobody dares to touch them.
05

Web developers new to mobile

Your React team writes good code but hasn't dealt with app stores, signing or device quirks.
06

Messy state and navigation

Without clear architecture, every new feature adds side effects and hard-to-find bugs.

Signs you need a React Native partner

If a few of these sound familiar, an experienced React Native team will save you time.

1

You're starting a mobile app with a React team

Your web engineers want to reuse their skills, but need people who know mobile releases and native code.

2

Your app is stuck on an old version

An upgrade keeps getting postponed while the store and OS requirements move on.

3

Crashes differ between iOS and Android

The same feature works on one platform and fails on the other.

4

Users complain about speed

Reviews mention slow loading, frozen screens or battery drain.

5

You need more React Native developers

The roadmap is full and hiring experienced React Native engineers is taking too long.

6

The original team is gone

An agency or freelancer built the app and you need someone to take it over properly.

What we do

React Native mobile app development services

New React Native apps

iOS and Android apps in React Native and TypeScript, from design to both store releases.

App takeover

We review an existing codebase, fix what blocks progress and become its long-term team.

Version upgrades

Step-by-step upgrades of React Native and its libraries, with a test plan for each step.

Native modules

Swift and Kotlin modules for cameras, Bluetooth, payments and other device features.

Performance tuning

Faster startup, smoother lists and fewer re-renders, measured before and after.

Shared code with web

Business logic and types shared between your React web app and your mobile app.

React Native staff augmentation

React Native engineers who join your team, work in your process and report to your lead.

Store releases and CI

Automated builds, signing and submissions to the App Store and Google Play.

What we check when we take over a React Native app

Before changing anything, we look at the parts that usually cause trouble.

Dependencies and versions

React Native and library versions

Unmaintained or risky packages

Upgrade path and effort

OS and store requirements ahead

Code and architecture

State management and navigation

TypeScript coverage

Native module quality

Test coverage and gaps

Performance and stability

Startup time and bundle size

Slow screens and long lists

Crash patterns per platform

Build and release pipeline

Our React Native stack

TypeScript and React on the shared side, Swift and Kotlin for native modules, and the backend your app talks to.

React
TypeScript
Redux
Swift
Kotlin
Xcode
Android Studio
Node.js
GitHub Actions
Who is this for

Who we build React Native apps for

Startups

You need iOS and Android apps fast, on one budget, with code that won't need a rewrite after the next round.

Product companies with React teams

Your web team knows React. We add the mobile experience and the native skills.

SMBs with an existing app

Your React Native app works, but it needs a reliable team to keep it current and keep adding features.

Agencies

You won a mobile project and need React Native engineers to deliver it under your brand.

Where can we help?

Build from scratch

A new app for both stores from one codebase.

Take over an app

Review, stabilize and keep developing it.

Upgrade React Native

Catch up on versions and libraries safely.

Speed up the app

Find and fix performance bottlenecks.

Add native features

Swift and Kotlin modules where they are needed.

Extend your team

React Native engineers inside your team.

How we work on React Native projects

01

Intro call

We talk through your app, your team and what you need: a new build, a takeover or extra engineers.

02

Discovery or code review

For new apps we define scope and design. For existing apps we review the code, dependencies and release setup.

03

Plan

You get priorities, a timeline and a team proposal. For team extension, you interview the engineers.

04

Development

Features delivered in sprints, with test builds on iOS and Android you can install yourself.

05

Release

QA on both platforms, then App Store and Google Play submissions handled by us.

06

Ongoing work

New features, upgrades and fixes on a steady release rhythm.

How we work

Choose your engagement

Project team

most popular

Starts with a 2-week Discovery Sprint

Fixed price after discovery, or monthly team.

For a new app or a takeover where we own delivery end to end.

React Native lead, engineers and QA

Design and backend if you need them

Regular demos and test builds

Both store releases handled

Long-term support after launch

Plan your app

Team extension

React Native engineers in your team

Monthly, per engineer.

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

Engineers matched to your stack

You interview and pick each one

Your process, tools and backlog

Native iOS and Android skills on call

Scale up or down as needed

Add engineers

Mobile apps we've built and scaled

E-COMMERCE & MARKETPLACE

Flashfood Grocery marketplace

USA
Canada
$247M
SHOPPER SAVINGS
Before
→
after
↓
Rapid scale across 700+ stores
↑
$247M in shopper savings
↓
Mobile reliability under pressure
↑
$16.5M raised
↓
Engineering capacity stretched thin
↑
1,600 stores served
↓
No clear path to recovery
↑
Sustained delivery cadence
Pharmacy · DACH

Redesigning and modernizing an Online Pharmacy mobile app

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

Our React Native engineers work next to our Swift and Kotlin engineers, so problems in the native layer don't stall your app.

What we bring

Mobile experience

7+ years building iOS and Android products.

Quick start

Engineers can start in about two weeks.

Returning clients

85% of our customers come back with new work.

Referrals

95% of our clients come referred by business partners.

Full stack around the app

React, Node.js, design and QA from the same partner.

What makes us different

Native depth

Swift and Kotlin skills in-house for the hard parts.

Upgrades planned, not feared

We keep versions current as part of normal work.

TypeScript throughout

Typed code that's easier to change and review.

You pick the people

For team extension, you interview every engineer.

Overlap with US hours

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

What our clients
frequently ask

Is React Native a good choice for our app?

For most apps built around screens, forms, feeds and data, yes. It's less suited to apps dominated by heavy graphics or deep hardware work. We'll tell you honestly after hearing about your product.

Can you take over a React Native app built by another team?

Yes. We start with a code review covering dependencies, architecture, native modules and the release pipeline, then agree what to fix first and keep shipping features alongside.

Our app is several versions behind. Can you upgrade it?

Yes. We plan the upgrade in steps, replace unmaintained libraries where needed and test each step on both platforms, so the app keeps working throughout.

How does React Native staff augmentation work?

You tell us the skills and seniority you need, review profiles and interview the candidates. The engineers you pick join your team, work in your process and are billed monthly.

Can our web developers work alongside your team?

Yes, and it often works well. Your React developers can contribute to shared screens and logic while our engineers handle native modules, builds and releases.

How do you price React Native projects?

New apps usually start with a 2-week fixed-price Discovery Sprint, then a fixed price for the agreed scope or a monthly team. Team extension is billed monthly per engineer.

No sales pitch

Tell us about your React Native app

A new app, a takeover or extra engineers: describe what you need and we'll reply with a suggested approach and next steps.

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