Mobile App Development (React Native & Expo)
We design and build cross-platform mobile apps that ship to iOS and Android from a single codebase — using React Native and Expo to move faster without sacrificing quality.
Start Your App ProjectWhat We Build
Grayon Technologies builds mobile apps for startups and businesses that need to move quickly without cutting corners. As a React Native and Expo specialist, we build one codebase that ships natively to both the App Store and Google Play — cutting development time and cost compared to building two separate native apps, without the compromises that come with low-code or hybrid webview tools.
Whether you're a founder with a Figma file and an idea, or a growing business that needs a companion app for an existing product, we take the project from technical scoping through to a store-approved release. We work directly with founders and technical teams, so you always know what's being built and why.
Our Process
Discovery & Scoping
We map your product requirements, target platforms, and timeline into a clear technical plan before a single line of code is written.
Design Handoff & Architecture
We translate designs (yours or ours) into a scalable app architecture — navigation, state management, and API structure.
Build in Sprints
Development happens in short, visible sprints with regular builds you can test on your own device throughout.
QA & Store Launch
Every build goes through our internal QA process before we handle App Store and Play Store submission for you.
Where This Fits
- Consumer social and community apps
- Marketplace and booking platforms
- Fintech and payments-adjacent tools
- Internal business and field-ops apps
- MVPs for early-stage startups raising funding
- Companion apps for existing web products
Example Work
MyArmy App
A personal safety and emergency response app: one-tap SOS alerts, live location sharing with trusted contacts, AI-assisted incident monitoring, and encrypted evidence capture.
View case study →Frequently Asked Questions
Yes — that's the point of building in React Native and Expo. We ship one codebase to both the App Store and Google Play, rather than maintaining two separate native apps.
Yes. Hand us a Figma file (or any design tool) and we'll translate it into a scalable app architecture. If you don't have designs yet, we can also work from a rough idea and shape the UX with you during discovery.
Expo's ecosystem covers the vast majority of device APIs startups need. If your product genuinely needs something outside it, we'll flag that during technical assessment before you commit budget to the wrong architecture.
Tech Stack
Why Choose Grayon
One Stack, Deep Expertise
We specialize in React Native and Expo rather than spreading thin across every framework — meaning fewer bugs and faster delivery.
QA Built Into the Build
Testing isn't an afterthought bolted on at the end. Our QA process runs alongside development from the first sprint.
Launch Support Included
We handle App Store and Play Store submission, compliance checks, and the back-and-forth with app review teams.
Related Services
Have an app idea?
Tell us what you're building and we'll map out a scope, timeline, and cost estimate.