Mobile Development
Mobile development services.
iOS and Android apps in both stores, fast to ship and easy to update, most often built with React Native and Expo. We build for the parts of mobile that are hard to get right, from offline use and notifications to payments and the app stores.
iOS and Android · Both stores
01 · Our mobile development expertise
The parts of a mobile product that are hard to get right, and how we handle them.
iOS and Android together
Most often React Native with Expo, which takes an app to both platforms at once, with platform-specific code only where the platforms differ, and the camera, location, maps, notifications and the rest of the device through the Expo ecosystem. When a feature needs the platform directly, a Swift or Kotlin module covers it.
Offline-first and data sync
Data is stored on the device, changes are queued while there is no connection, and sync with conflict handling runs when the connection returns, so the app remains usable without coverage and catches up once it is back.
Push notifications and deep links
Notifications that open the right screen, background tasks, and links from email, the web or another app into the exact place in yours, set up in the first version because they shape onboarding and retention.
Payments and in-app purchases
Card payments through Stripe or a similar provider, and in-app purchases and subscriptions through the App Store and Google Play, with receipt validation and the store rules that come with them.
Releases and over-the-air updates
Builds and store submissions run through EAS, store compliance is handled with you, and updates go out over the air for the changes that do not need a review, so a fix reaches users the day it is ready.
Performance on real devices
Startup time, list scrolling, memory and battery are measured on real iOS and Android devices, with targets a release has to meet, rather than on a simulator alone.
02 · How we ship apps
Releases that do not wait on the stores.
React Native with Expo covers both platforms and gives a release process that does not depend on the app stores’ calendar. Builds and submissions run through EAS, and over-the-air updates carry the changes that do not need a review.
Engineers work with AI coding assistants every day, and a second engineer reviews the changes that carry risk. Automated tests and CI run on every change, monitoring and error tracking are in place before launch, and you see the app on your own phone as it takes shape.
Engineering standards
The same rules on every project, whatever its size.
Typed by default
Most of what we build is TypeScript, front end, back end and mobile, so a whole class of mistakes is caught before users see it and the next engineer can read the codebase. Where a product calls for another language, the same discipline comes with it.
Review where it counts
Types, tests and CI check every change on their own. A second engineer reviews the changes where a mistake would be expensive, in architecture, data, security and payments, whether a person or an AI wrote them.
Automated tests and CI
Tests run on every change in a pipeline that blocks what fails. Nothing reaches production by hand.
Staged environments and safe deploys
Separate development, staging and production environments, and deployments that do not take the product down.
Security as routine
Nothing waits for a security phase at the end. Dependencies are kept current, secrets stay out of the code, access is granted on a need-to-have basis, and every project is checked against the OWASP list.
Performance, measured
The screens and endpoints that matter get a target they have to meet, and we profile and test against it before a release rather than guess.
Monitoring before launch
Error tracking and uptime monitoring in place before the first user arrives, with AI-assisted triage after.
Documented and handed over
Decisions written down as they are made, instructions for running the product, and a clean handover if your own team takes over.
How you follow the build
Work runs in two-week sprints, and each one ends with a demo of working software. The backlog and the progress sit on a shared board you can open at any time, and the team is available to talk, review and decide throughout the sprint, not only at the demo.
Every change goes through automated tests and CI before it reaches staging, the ones that carry risk through a second engineer as well, and nothing reaches production by hand. When something breaks after launch, monitoring tells us before your users do.
- Discover
- Prototype
- Build
- Test on real devices
- Launch
03 · From idea to the app stores
Five steps, and the prototype is on a phone by the second one.
Discover
Days
A first version worth building, with the reasoning behind every cut.
We establish your goal, your users, and what the first version has to do. AI-assisted research surfaces the competitors and the first personas, and your knowledge of your customers completes the picture.
Prototype
Days
A prototype on your own phone, close to the app that will ship.
A working prototype is on a phone within days, so you judge the real thing. A designer directs it, and engineers build from it.
Build
2 to 6 weeks for an MVP
Builds on your phone as the app takes shape, with a demo at each step.
We build in the stack the app will grow in, most often React Native with Expo. Engineers use AI coding tools every day, and a second engineer reviews the changes that carry risk.
Most often
- TypeScript
- React
- React Native
- Expo
- Node.js
- PostgreSQL
Test on real devices
Before each submission
An app exercised on real iOS and Android devices, ready for review.
Automated tests and CI run on every change, and the app is exercised on real iOS and Android devices before it is submitted to either store.
Launch
Days
Live in both stores, with monitoring in place before the first download.
Store submissions go through EAS, monitoring and error tracking are in place before the first download, and over-the-air updates stand ready for the first fix.
Most often
- AWS
- Cloudflare
- EAS
- App Store
- Google Play
What moves the timeline
The promise is for a focused first version, from the day the scope is agreed. Two things move it.
Where you start
- An idea
- Discovery and a prototype come first. Days, not weeks.
- A validated prototype
- Straight to the build.
- An existing product
- A short review of the code and the release setup, then a plan.
What you are building
- A focused MVP
- Live in 2 to 6 weeks, and in 2 when the scope is tight.
- A larger product
- Several applications, payments or identity, a regulated market. We tell you what it takes after discovery, before work starts.
04 · What we build with
The stack is chosen for each app.
These are the technologies we work with most.
Mobile
React Native with Expo, with EAS for builds, submissions and over-the-air updates, Expo modules for the device, and Swift or Kotlin for the pieces that need the platform directly.
Backend
Node.js on the server, with PostgreSQL first and MongoDB, Neo4j or Redis when the data has a different shape. The backend’s infrastructure, deployments and monitoring are handled by our cloud engineers.
Cloud
AWS first, Cloudflare where it fits, and a plain server when that is the right size, with Docker-based deployments, separate development, staging and production environments, and CI/CD on every change.
AI features
Claude, GPT, Gemini or open models, chosen per use case.
05 · Related work
Apps we have shipped.
06 · Frequently asked questions
What founders ask about an app.
Native or cross-platform?
Cross-platform serves most apps. React Native with Expo provides both stores at once and a faster release cycle, and it is what we build most apps with. Camera, location, maps, notifications and the rest of the device come through the Expo ecosystem, and when a feature needs the platform directly we write that piece in Swift or Kotlin and keep the rest shared. Fully native apps are the exception, and we advise you plainly when yours is one.
How long does a mobile MVP take?
Most mobile MVPs take 2 to 6 weeks, and 2 when the scope is tight. Store review adds a few days at the end, and we plan for them. The timeline depends on how many flows the first version needs, which integrations it depends on, and how quickly decisions are made on your side.
Does the app work offline?
It does when it needs to. We build offline-first apps that store data locally, queue changes made without a connection, and sync when the connection returns, with the conflict handling that sync requires. Which parts of an app must work offline is a product decision we make with you early, because it shapes the data model.
Do you handle notifications and deep links?
Yes. We deliver push notifications that open the right screen, background tasks, and deep links from email, the web or another app into the exact place in yours. We set them up as part of the first version rather than as an addition, because they shape onboarding and retention from day one.
Can you handle payments and subscriptions?
Yes. We implement card payments through Stripe or a similar provider, and in-app purchases and subscriptions through the App Store and Google Play, with purchases verified on the server and the store rules that come with them observed. We have shipped both and will advise you which one your product is permitted to use for what.
Do you handle the app stores?
Yes. Builds and submissions go through EAS, and we take the app through App Store and Google Play review with you, covering the accounts, the listings, and the material reviewers ask for. Updates that do not need a review go out over the air, so the first fix after launch does not wait in a queue.
Can you take over an existing app?
Yes. We begin with a short review of the code and the release setup, tells you what holds up, and plans the shortest route to the next release. Apps built in React Native are the easiest to continue. Apps built in other stacks receive a clear recommendation, which is not always a rewrite.
How is mobile development priced?
A first version is usually a fixed-price project with an agreed scope, an agreed price and a launch date. After launch, a monthly retainer covers fixes, improvements and the next features, and larger products run on time and materials billed monthly. We quote after a short call about what the app has to do.
Blog
From the blog
Why we build mobile apps with React Native and Expo in 2026
One codebase that feels native on iOS and Android, custom interfaces when the product calls for them, EAS for builds and updates, a maintained library for almost everything, native modules when you need them, and a stack that AI coding agents handle better than most. These are the reasons React Native with Expo is our default for mobile.
5 Steps to Successful MVP Mobile App Development for Startups
You do not need substantial funding to act on an app idea. The most effective approach is to begin with a Minimum Viable Product (MVP). This guide sets out five steps for launching your MVP mobile app.
What Does it Cost to Build a Mobile App in 2023?
Find out how much it costs to build a mobile app and why choosing an MVP development agency is the right decision for your business. Learn the importance of a high fidelity prototype and the benefits of cross-platform mobile app development. Discover why WeaveLines is the right partner for your next project.
Mobile Development
Your app, in both stores, in weeks.
Tell us what the app has to do, and we will tell you what it would take.