Custom mobile app development for iOS and Android
FullStack Dev KZ designs and builds production mobile applications for businesses, founders, and software teams. We connect the visible app experience to the less visible work that makes it dependable: authentication, application data, APIs, notifications, subscriptions, offline behavior, administration, and release preparation.
A strong fit for
- Businesses creating a customer-facing or staff mobile application
- Founders turning a product concept into a working mobile release
- Software companies adding a mobile companion to an existing platform
- Teams replacing a fragile prototype or extending an existing application
A mobile product is more than a set of screens
A useful mobile application has to fit the moments in which people actually use it. A field-service app may need quick access to jobs and customer records with unreliable connectivity. A membership app may need accounts, bookings, reminders, and a web administration surface. A consumer product may need subscriptions, local data, notifications, and clear recovery when a request fails.
The project therefore starts with the user journey and business rules rather than a list of fashionable features. We identify what belongs on the phone, what belongs in the backend, what can be reused from an existing system, and what has to be operated after release. That keeps the mobile experience focused while giving the product a realistic technical foundation.
Mobile applications we can build
The implementation can be a standalone app or one part of a larger web and backend platform. The exact combination follows the product requirements.
Customer and membership apps
Account-based products for booking, participation, content, reminders, payments, and ongoing customer access.
Business and field apps
Mobile workflows for jobs, customers, documents, catalogues, orders, staff activity, and work away from a desk.
SaaS companion apps
Mobile access connected to an existing or new SaaS platform, sharing accounts, permissions, data, and notifications.
Focused utility products
Purpose-built apps using on-device storage, OCR, reminders, subscriptions, or secure document handling where those capabilities are useful.
From product scope to store-ready release
The delivery path is adapted to the project, but the core decisions happen in a deliberate order so design, backend, and release work stay aligned.
- 01
Define the product
Clarify users, essential journeys, commercial model, existing systems, and the outcome the first release must support.
- 02
Choose the architecture
Decide how mobile, backend, web administration, local storage, integrations, and authentication should work together.
- 03
Build the core journeys
Implement the interface and application behavior in working increments, using real data flows rather than disconnected mock screens.
- 04
Integrate and test
Connect APIs, notifications, purchases, device capabilities, and error handling, then test the important paths on representative devices.
- 05
Prepare release
Produce store-ready builds, required app information, privacy links, and a practical handover for the next development phase.
Decisions that shape mobile scope
Mobile cost and delivery depend on the number of workflows, platforms, backend requirements, device integrations, administration needs, offline expectations, and store-release obligations. An app that displays existing account data is different from a new product that also needs user management, billing, and an operational dashboard.
React Native is often a strong fit when Android and iOS should share product logic and interface work. It is not treated as an automatic answer: unusual native requirements, existing code, performance constraints, and long-term ownership should influence the decision.
Useful before we start
- • Who will use the app and in what setting
- • The essential task users must complete
- • Existing APIs, databases, or web products
- • Required mobile platforms and target release
Common connected work
- • Authentication and user accounts
- • Backend APIs and business data
- • Push notifications and reminders
- • Subscriptions, local storage, and admin tools
Related products and case studies
TradesMate
A mobile business workflow connecting jobs, customers, quotes, invoices, payments, and expenses.
View this projectCome Together
An Android companion within a wider club events, attendance, and community platform.
View this projectDocs Scan OCR
A focused Android product using on-device OCR and encrypted document workflows.
View this projectRelated software decisions
These guides help define what should be built before selecting or scoping this development service.
See this capability in context
These pages connect the service to operational workflows demonstrated by real products.
Questions about mobile app development
Can you build for both Android and iOS?
Yes. React Native and Expo can support a shared application for Android and iOS when the product requirements suit a cross-platform approach. Platform-specific behavior is assessed during scope and architecture work.
Does every mobile app need a backend?
No. Some focused apps can keep their data on the device. Products with accounts, shared data, administration, subscriptions, synchronization, or web access usually need a backend or an integration with an existing one.
Can you work with an existing backend?
Yes, provided the current APIs, authentication model, documentation, and access can support the mobile workflows. An integration review normally identifies gaps before implementation.
Can you help prepare the app for store release?
Yes. Delivery can include release builds, store-facing information, privacy and account-deletion links where required, and technical preparation for Google Play and App Store submission. Store approval remains controlled by the platform.
What helps us scope your project
A complete technical specification is not required. A clear description of the workflow and constraints is enough to start shaping the right next step.
Read the software estimation guide- The people who will use the software and the main workflow they need to complete
- The platforms involved: mobile, web, administration, backend, or a connected combination
- Existing systems, APIs, spreadsheets, data, or manual processes that must remain or be replaced
- Required integrations, fixed deadlines, release constraints, and must-have outcomes
Planning resources
Turn your mobile requirement into a buildable product
Share the users, core workflow, existing systems, required platforms, and target release. We can identify the right mobile, backend, and delivery scope.