Rast Mobile

Mobile App Development

We build iOS and Android
mobile apps.

Since 2014, we have built mobile products for field service, commerce, delivery operations and consumer products. We can develop a new app from the ground up, take over an existing codebase or support your product team with Flutter and React Native expertise. Architecture, backend integrations, testing and store releases are handled within the same development process.

Mobile app engineering

From framework selection to App Store and Google Play release.

Choosing the right framework

We evaluate Flutter and React Native according to the product, the current team, required SDKs and long-term maintenance. When platform-specific development is needed, we include native iOS or Android code in the project.

A maintainable project structure

We separate interface, business rules and data access, and organise the code by feature where appropriate. Architecture, state management and testing choices are documented so the project can continue with a growing team.

APIs, real-time data and notifications

We integrate REST or GraphQL APIs, authentication and push notifications. For chat, tracking or frequently changing data, we design WebSocket-based flows together with the backend and the mobile interface.

Offline use and synchronization

For field and operation applications, we define which data should be available offline, which actions should wait on the device and how synchronization conflicts should be handled when the connection returns.

CI/CD, testing and store releases

We can automate tests, builds and internal distribution with CI/CD. We also support signing, versioning, TestFlight, Google Play test tracks and the technical requirements of store submissions.

Performance testing on real devices

We test on representative iOS and Android devices and measure startup, scrolling, memory and network behaviour. Lists, images, rendering and API use are optimised according to the bottlenecks found in profiling.

Flutter and React Native services

Explore our Flutter and React Native services.

The dedicated pages cover our technical approach, consultancy scope and mobile projects developed with each framework.

Our Approach

How we architect
mobile excellence.

01

Framework selection

We compare Flutter and React Native according to the product, team and integration requirements.

02

Maintainable project structure

Feature-based modules and clear boundaries between interface, business rules and data access.

03

Real-time and offline data

Real-time updates, notifications and offline storage designed around the product workflow.

04

Build and release automation

CI/CD can automate tests, builds and internal distribution for iOS and Android.

05

Performance testing

Startup, rendering, memory and network behaviour measured on representative devices.

06

Testing & Quality Assurance

Unit and widget tests on critical paths - payments, auth, data sync - checked by CI on every push.

Framework selection

We compare Flutter and React Native according to the product, team, native SDK requirements and long-term maintenance plan before selecting the framework.

Mobile app projects

Common technical questions

Flutter and React Native are a good fit when the iOS and Android applications share most screens and business rules. A fully native approach may be more appropriate for platform-specific interfaces, intensive hardware integrations or established native teams. We evaluate these conditions before recommending a framework.

We usually organise the code by feature and separate the interface, business rules and data access. The architecture and state-management approach are selected according to the size of the product, the team, testing needs and any conventions already in use.

React Native may be a suitable choice when the team already works with React and TypeScript. We also review Expo or bare workflow requirements, native SDKs, existing packages and the long-term maintenance plan before making the decision.

Yes, when the product requires it. We define which screens and data should remain available, which actions can be completed offline, how pending changes are synchronized and how conflicts should be resolved when the connection returns.

We generally use WebSockets or a similar connection for continuously changing data, and push notifications for event-based updates. The final design also considers backend capabilities, background behaviour, permissions and how the information should appear in the interface.

We support signing, TestFlight and Google Play test tracks, store metadata, privacy information and review responses. App Store and Google Play accounts remain under the client’s ownership, and final approval is always given by the relevant platform.

The schedule depends on the number of screens, backend readiness, integrations, design, security requirements and store processes. After the initial analysis, we prepare a phased plan and agree on when testable builds will be shared.

We test on representative iOS and Android devices rather than relying only on simulators or flagship models. Startup time, scrolling, memory, rendering and network usage are profiled, and optimisation work is based on the bottlenecks found.

We plan tests according to product risk. Business rules, authentication, payment and data synchronization are typical priorities. Unit, widget and integration tests can run in CI, and the appropriate coverage is agreed with the team rather than applying one target to every project.

Planning a new app or improving an existing one?

We can discuss a new build, taking over an existing codebase or providing technical support to your mobile team.

Discuss the project