Mobile App Development
React Native and Flutter apps built to fintech standards — including a remittance app with sub-3-minute onboarding for a regulated LATAM neobank.
Mobile apps we build
We build cross-platform mobile apps in React Native and Flutter, dropping to native Swift and Kotlin where a feature demands it. Our specialty is apps where mistakes cost money: remittances, wallets, banking features, trading interfaces, and payment-enabled products. The consumer remittance app we built for the USA-to-LATAM corridor onboards a new user in under three minutes, KYC included, and moves real money at a flat $1.99 fee.
That fintech bias shapes everything: secure storage and biometrics by default, offline-tolerant state that never shows a wrong balance, and instrumentation that turns user drop-off into fixable engineering tickets. Teams outside fintech hire us for the same reasons — the standards travel well even when the stakes are lower.
One codebase, native quality
React Native and Flutter earn their keep by halving surface area — one team, one codebase, both stores — but only if performance is treated as a feature. We profile startup time, keep animation work off the JavaScript thread, and use native modules for camera-based KYC, cryptography, and anything else the framework does poorly. Users should never be able to tell the app is cross-platform.
Backend integration is half of mobile quality, and we build both sides: API contracts designed for flaky mobile networks, idempotent money operations so a double-tap never double-sends, and push notifications, deep links, and session handling that still behave after weeks in the background. When the backend is ours too, those seams disappear entirely.
Why CodeDecoders for mobile development
Most mobile shops have never shipped an app where a rendering bug could misstate someone's balance. We have — for a regulated LATAM business neobank, with KYC, remittances, and a USDC on/off ramp with roughly 60-second processing behind it. That app had to satisfy the business, its users, and its regulators at the same time.
Because we also build payment infrastructure, ledgers, and AI systems, a mobile engagement with us can extend into whatever the product needs next: the app, the API behind it, and the settlement rail behind that, all from one accountable team that has been doing this since 2021.
Process and engagement
A typical build runs six to twelve weeks to a store-ready release: a short design-and-architecture sprint, then weekly shippable increments on TestFlight and Play internal tracks from the first weeks. You see the real app on your own phone early and often, so course corrections cost days rather than milestones.
After launch we run releases, monitoring, and iteration under retainer, or hand the codebase to your team with CI/CD via Fastlane, over-the-air update pipelines, and end-to-end test suites included. App store review, staged rollouts, and crash triage are part of delivery, not extras.
Frameworks
Fintech features
Delivery
Common questions
React Native or Flutter — which should we choose?+
Either can ship an excellent app; the decision is usually about your team and ecosystem. React Native fits teams with React and TypeScript skills and lets you share code with a web product, while Flutter offers strong rendering consistency on both platforms from one Dart codebase. We work in both and recommend one for your specific product rather than by default.
How long does it take to build a mobile app?+
Six to twelve weeks to a first store release for most products, depending on scope, backend readiness, and review cycles. Fintech features such as KYC and payments add provider-integration time more than raw engineering time. Either way, you will have working builds on your phone within the first few weeks.
How much does mobile app development cost?+
We quote fixed prices per milestone after a scoping call, since a wallet with KYC and a content app differ by multiples. Cross-platform development keeps the cost close to one codebase instead of two, which is most of the economic argument for it. Phased delivery means you can stop at any milestone and still have a working app.
Can you build the backend as well as the app?+
Yes, and for fintech products we recommend it, because the hardest bugs live in the seam between app and API. We build the full stack: mobile app, API, ledger, payment integrations, and infrastructure. One team owning both sides is a large part of why our remittance app onboards users in under three minutes.
Do you handle App Store and Play Store submission?+
Yes: provisioning, store listings, review responses, staged rollouts, and the compliance questionnaires that financial apps trigger. Fintech apps get extra scrutiny from both stores, and we have been through those reviews before. Post-launch, over-the-air updates let us ship fixes without waiting on review where store policies allow it.
Building mobile apps? Let's scope it.
We scope engagements in days, not weeks. Send a few lines about your project and we respond within 24 hours.
Let's build something extraordinary together.
Free consultation·Response within 24h·No commitment
info@codedecoders.io