Mobile App DevelopmentServices
Kindgeek delivers mobile app development services for banks, EMIs, payment providers, lenders, and enterprise platforms. One accountable partner from start to finish.
Custom Mobile App Development Services
These mobile app development services run as separate engagements or as one continuous delivery stream.
Mobile Product Discovery and Consulting
Discovery clarifies the budget before engineering begins. Stakeholder and user interviews, surveys, competitor analysis, and a Value Proposition Canvas help define the scope and turn assumptions into a realistic estimate.
UX/UI Design and Prototyping
Design has a direct impact on how many users complete onboarding and how many drop off. We start with research, move through wireframes and usability testing, then create the high-fidelity design in Figma.
Native Mobile App Development
Native pays off when the product depends on the platform itself. Swift and SwiftUI on iOS, Kotlin and Jetpack Compose on Android, with the deepest access to Secure Enclave, Keystore, biometrics, NFC, and wallet provisioning.
Cross-Platform App Development
Flutter or React Native lets you use one codebase across both app stores, so adding a second platform doesn't have to double the bill. Our in-house Flutter team has experience building fintech apps, including products designed for high-volume user onboarding.
Mobile Backend and API Development
An app is only as dependable as the services behind it. Java and Spring, Python, Node.js, GraphQL and REST, Kafka, and AWS. Mock servers let mobile work run in parallel with backend delivery.
Mobile App Integration
Integration work usually decides the launch date. Core banking, card issuing and acquiring, KYC, ledgers, and support desks. Recent integrations include Sumsub, Kraken, Fireblocks, Softledger, BankFrick, Freshdesk, and Salt Edge.
Mobile App Testing and QA
Payment defects carry higher financial and reputational risk, so testing starts early. Automated tests run in CI on every pull request, with 70–80% coverage for critical business logic. Manual QA adds exploratory, device matrix, and accessibility passes.
App Modernization and Migration
Replatforming, service extraction, backend replacement, and pipeline rebuilds, planned in phases to modernize the stack without taking the product offline or disrupting existing users.
Mobile Apps We Build
Every category below reflects products Kindgeek has helped deliver.
Banking Apps
Balances, transaction history, domestic and international transfers, statements, and card controls for retail and business account holders.
Neobank and White-Label Banking Apps
A complete banking front end running on a shared core, so several brands can launch from one platform, with the build cost shared across all of them.
Payment and Wallet Apps
P2P and multi-currency transfers, QR payments, contactless NFC, top-ups, and real-time transaction feeds.
Card and Credit Apps
Virtual and physical card issuing, instant freeze and unfreeze, PIN management, spending limits, credit tracking, and repayments. Wallet provisioning for Apple Pay and Google Pay.
Personal Finance and Money Management Apps
Budgeting, savings goals, shared spending, and analytics built on categorised transaction data. Retention tracks the quality of that categorisation.
Crypto and Digital Asset Apps
Fiat and crypto conversion in both directions, wallet storage, trading platform integrations, and an advanced general ledger.
Lending and Supply Chain Finance Apps
Application and origination flows, credit decisioning, repayment schedules, and investor or buyer portals.
Enterprise and B2B Platform Apps
Procurement, invoicing, payments, and supply chain workflows delivered as mobile clients on top of existing enterprise systems.
Native and Cross-Platform Mobile App Development
Platform choice drives budget and the ceiling on what the product can do later. Kindgeek gives a recommendation with reasoning attached.
iOS App Development
iOS carries the strictest review process and the strongest security primitives, which suits products handling money. Swift and SwiftUI with Secure Enclave, Face ID and Touch ID, App Attest, Apple Wallet provisioning, and App Clips.
Android App Development
Android brings the widest device range, which makes compatibility and controlled release the risks worth managing. Kotlin and Jetpack Compose with Keystore, BiometricPrompt, Play Integrity, Google Wallet provisioning, and staged rollouts.
Flutter App Development
Flutter suits products where the interface is the differentiator, since one codebase renders identically on both platforms. Our Flutter work uses offline-first patterns, optimistic UI, and background synchronisation.
React Native App Development
One JavaScript and TypeScript codebase across iOS and Android, with a large ecosystem behind it. A common choice for MVPs where time to market carries more weight than deep platform integration.
How Kindgeek Chooses Between Native and Cross-Platform
Native iOS and Android
For wallet provisioning, NFC, and deep Secure Enclave or Keystore use. Security and payment APIs land first in native.
Flutter or React Native
For an MVP covering both platforms on a single budget. One codebase shortens the first release cycle.
Flutter
For highly custom UI and rich animation. Its own rendering engine keeps both platforms identical.
React Native
For a product already built on JavaScript and TypeScript. Existing language and tooling carry over.
Cross-platform with a planned migration path
For cross-platform first, native later as scale grows. We ran this route on HyperJar and budget it openly.
AI Features in Mobile Products
We add AI where it moves a measurable product metric, usually activation or support cost.
Spending Insights and Personalization
Personalised money insights give users a reason to open the app between transactions. Transaction data becomes categorised spending and budget prompts, built on a classification pipeline inside an agreed data handling model.
Intelligent Onboarding and Risk Decisioning
Risk-based onboarding routes low-risk users through a short path and escalates the rest, which lifts conversion while keeping the compliance team comfortable.
Mobile App Features and Integrations We Build
Authentication, Biometrics, and Digital Identity
Sign-in that feels instant and still holds up to scrutiny. Face ID and Touch ID, BiometricPrompt on Android, keys bound to Secure Enclave or Keystore, PIN fallback, and Keycloak with OAuth 2.0 and OpenID Connect. National rails include Diia and BankID NBU.
Payments and In-App Transactions
A2A transfers, SEPA, card payments, QR flows, multi-currency wallets, fee logic, and approval hierarchies. Open Banking runs through our Salt Edge partnership for AISP and PISP flows.
Push Notifications and Real-Time Messaging
Instant alerts drive engagement and cut fraud response time. Transaction alerts, fraud warnings, and authentication challenges ship on infrastructure with delivery guarantees.
Offline Functionality and Data Synchronization
Users on a train still expect to see their balance. A local database as source of truth, background sync, freshness indicators, and optimistic UI keep the app usable when the connection drops.
Resilience and Error Handling
A slow third-party service stays contained to one screen. Circuit breakers, exponential backoff, timeout handling, and graceful degradation keep the rest of the app usable while a dependency recovers.
Third-Party APIs and Enterprise Systems
Core banking, ledgers, KYC vendors, crypto custody, CRMs, and support desks. Legacy estates get adapters and progressive migration, so modernisation runs alongside new feature work.
Data Visualization and Analytics
Charts are where users judge whether the product understands their money. Custom balance, spending, and transaction views with drill-down to a single transaction.
Secure and Scalable Mobile App Architecture
In regulated finance, security is what protects the customer base and the licence. Kindgeek holds ISO 27001:2023 and ISO 9001:2015, and commissions independent penetration tests with reports available under NDA.
Client-Side Protection
Fraud usually starts with a compromised device. App Attest and Play Integrity confirm the app runs on a genuine device, and runtime protection detects jailbreak, root, emulator, and reverse engineering attempts.
Data Protection on the Device
A lost phone leaves the account safe. Cryptographic keys stay inside Secure Enclave or Android Keystore and bind to biometric authentication, and session tokens are encrypted before they reach local storage.
API and Backend Security
Most attacks aim squarely at the API. Certificate pinning, server-side request signing, token rotation, and an audit log on sensitive operations.
Scalable Cloud-Native Backends
Growth campaigns create the load spikes that break undersized systems. Event-driven services on Kafka, containerised deployment, and CI/CD with quality gates. HashiCorp Vault handles secrets on programmes such as JAJA.
Accessibility and Inclusive Design
Accessibility widens the addressable market and clears procurement checklists. WCAG 2.1 AA, VoiceOver and TalkBack support, and semantic labels on interactive elements.
Compliance for Regulated Mobile Applications
Regulatory scope enters the architecture during discovery: PSD2 strong customer authentication, PCI DSS-aligned card data handling, AML and KYC obligations, GDPR, and card scheme requirements.
Our Mobile App Development Process
Discovery and product strategy
UX research and product design
Architecture and technical planning
Mobile and backend development
Testing, security, and performance validation
App Store release and deployment
Analytics and continuous improvement
Our Mobile App Development Projects
Diaspora
payabl.
BioPay
YouCapital
Greenvest
JAJA
HyperJar
Mobile App Development Technology Stack
iOS
Swift, SwiftUI, Secure Enclave, LocalAuthentication, App Attest, Apple Wallet
Android
Kotlin, Jetpack Compose, Keystore, BiometricPrompt, Play Integrity, Google Wallet
Cross-platform
Flutter and Dart with BLoC and Cubit, React Native with TypeScript
Local storage
Isar, Hive, Realm
Backend
Java and Spring, Python with Django and FastAPI, Node.js, .NET integration experience
APIs and messaging
REST, GraphQL, OpenAPI, Apache Kafka
Web and admin
React, Next.js, Angular, TypeScript
Cloud and DevOps
AWS, S3, Jenkins, HashiCorp Vault, SonarQube, GitHub, GitLab, Bitbucket
Identity and compliance
Keycloak, OAuth 2.0, OpenID Connect, Sumsub, Salt Edge, Diia, BankID NBU
How Much Does Mobile App Development Cost?
What moves the budget:
Platform strategy
One cross-platform codebase costs less to build and maintain than two native apps.
Integration count
Each core banking, KYC, ledger, or payment rail integration adds build and test effort.
Regulatory scope
SCA, card data handling, AML, and audit requirements add design and documentation work.
Design depth
A full design system costs more upfront and reduces rework during build.
Backend ownership
Building services and APIs costs more than integrating with an existing platform.
Team size and duration
Our mobile programmes have run with teams from 7 to 35 specialists.
MVP Versus Full Product
MVP
One core journey plus the compliance minimum, which keeps the first release affordable and produces real usage data to argue from.
One core user journey
Compliance minimum
Affordable first release
Real usage data to argue from
Full product
Everything in the MVP, extended with the scope that follows commercial growth.
Multiple account types
Back office
Analytics
Integrations that follow commercial growth
How Long Does It Take to Develop a Mobile App?
Reference points from delivered Kindgeek programmes:
Discovery and design
A few weeks
MVP delivery
7.5 months
Focused mobile product
6 months
Full mobile product to store
About 1 year
What Accelerates or Delays Delivery
Slows delivery down
Third-party providers gating integration
Licensing or certification on the critical path
Scope expanding mid-sprint
Speeds delivery up
API contracts agreed early
A proven core underneath
One team across app and backend
Engagement Models
End-to-End Mobile Product Development
Kindgeek owns discovery, design, engineering, QA, release, and support, with one accountable team, a predictable cadence, and one invoice.
Dedicated Mobile Development Team
A stable team works on one product only, inside agreed processes and tooling. Our largest programmes have run with up to 35 specialists.
Team Augmentation
Individual mobile, backend, QA, or design engineers integrate into an existing team under client management, which lifts delivery capacity.
Modernization Partnership
We take ownership of an existing app, stabilise it, then modernise incrementally while it stays live and revenue continues.
How Kindgeek Ensures Mobile App Quality
Automated testing
Unit, widget, integration, and golden tests on every pull request, with coverage targets agreed per project.
Performance validation
Backend load testing and on-device profiling reviewed before release.
Security testing
Independent penetration testing plus runtime protection and attestation checks in the release process.
Device and OS compatibility
Device matrix testing across supported OS versions and screen classes.
Accessibility testing
WCAG 2.1 AA verification with VoiceOver and TalkBack.
App store readiness
Policy pre-checks, complete metadata, staged rollout, and post-release monitoring.
Frequently Asked Questions About Mobile App Development
Start Your Mobile App Development Project
Send Kindgeek the product context, the timeline, and the regulatory perimeter involved. A reply follows within 24 hours with a platform recommendation and a proposed team structure.