Mobile development is deceptively easy to start and deceptively hard to finish. The first version of your app will take three months. Making it fast, reliable, offline-capable, accessible, and ready for the App Store review process is where most agencies fall apart. Key Brains has shipped over 40 mobile applications across iOS and Android. We have seen every failure mode.
React Native vs Flutter vs native — how we decide
We do not have a favourite framework. We have a process for choosing the right one. React Native is the right choice when your team already knows JavaScript and you need a shared codebase across platforms. Flutter is the right choice when pixel-perfect custom UI is a priority and you want strong performance on lower-end Android devices. Native Swift and Kotlin are the right choice when you need deep platform integration — custom camera pipelines, Bluetooth, background processing, or hardware-specific APIs that cross-platform frameworks do not expose cleanly.
We make this recommendation in writing at the start of the project and explain the trade-offs. You decide.
Offline-first architecture
Most mobile apps assume a connection. Real-world users do not always have one. We build apps with local-first data architectures — SQLite, Realm, or WatermelonDB depending on the complexity — with conflict resolution strategies for when the device reconnects. This is harder to build than online-only apps. It is also the difference between an app that gets used and one that gets deleted.
Performance that does not degrade
A fast app on launch day that slows down as the database grows is a design failure, not a performance problem. We profile memory usage, render performance, and list virtualisation from the beginning of development. We use tools like Flipper, Instruments, and Android Profiler as standard practice — not as an afterthought when users start complaining.
App Store submission
We handle the entire App Store and Google Play submission process — provisioning profiles, signing certificates, privacy manifests, screenshot sets, metadata, and the back-and-forth with Apple review. We have done this enough times that we know which features trigger manual review and how to write release notes that do not attract unnecessary scrutiny.
Post-launch support
Mobile apps are not websites. A bug in production cannot be fixed with a server-side deploy. We build crash reporting with Sentry or Firebase Crashlytics into every app we ship, and we maintain a clear process for emergency patches and phased rollouts.
3. Web & UI/UX Design
Design is not how it looks. Design is whether users can actually do what they came to do.
Most agencies separate design from engineering. A design team hands over a Figma file, an engineering team tries to implement it, and somewhere in the middle the product becomes a compromised version of both. At Key Brains, design and engineering work together from the first day of the project. Our designers write acceptance criteria. Our engineers attend design critiques. The gap between the design and the product does not exist because we do not allow it to.
Discovery and research
Every design engagement begins with a structured discovery phase. We interview your users, audit your existing product or competitor products, map the jobs-to-be-done, and document the design constraints before we open Figma. This takes one to two weeks and saves months of rework.
Information architecture
Before visual design begins, we define the structure. Sitemaps, user flows, content hierarchies, and navigation models. We make sure the product makes sense before we make it beautiful. This is the phase that most agencies skip, and it is the phase that causes the most expensive problems later.
Design systems
We build design systems, not collections of individual screens. A component library in Figma with documented states, variants, spacing tokens, colour tokens, and typography scales. When we hand off to engineering, the system is already defined. Developers do not make visual decisions. They implement what the design system specifies.
Prototyping and user testing
We prototype in Figma before any engineering work begins on new features. We run moderated usability tests with real users from your target audience — not internal stakeholders — and iterate on the findings before the first sprint starts. This process typically prevents three to five major rework cycles per project.
Accessibility
We design to WCAG 2.1 AA as a minimum standard, not as an optional extra. Colour contrast ratios, keyboard navigation, screen reader compatibility, and focus management are designed in from the beginning. Accessibility retrofits are expensive. Accessible design from the start is not.
Handoff
We deliver Figma files with developer annotations, a component inventory, a spacing and typography specification, and a written rationale for major design decisions. Our engineering team uses these files directly. When an external engineering team is involved, we conduct a structured handoff session and remain available for questions during implementation.