Swift · SwiftUI · Core ML · ARKit · Fastlane
iOS App Development
Our iOS app development practice is built on the full Apple technology stack — Swift, SwiftUI, Core ML, ARKit, and Metal — combined with a CI/CD pipeline powered by Fastlane and GitHub Actions. Every enterprise-ready iOS app is enrolled in the Apple Enterprise Program, uses TestFlight for staged distribution, and ships with App Store Optimisation baked in. We follow OWASP Mobile Security Testing Guide requirements on every project, run automated static analysis, and embed accessibility compliance (ADA, WCAG 2.1 AA) from the design stage. For New York clients in regulated sectors, our iOS apps include HIPAA-compliant data handling, encrypted local storage, and certificate pinning as standard.
Kotlin · Jetpack Compose · AES-256 · Zero-Trust
Android App Development
As a custom mobile application development company in New York with deep Android expertise, we build for the full Android ecosystem using Kotlin and Jetpack Compose. Our Android mobile app development services include SOC 2 Type II-aligned DevSecOps pipelines, AES-256 encryption at rest, and zero-trust network architecture for enterprise deployments. We build for fragmentation — testing across 60+ device/OS combinations — so your app works consistently from the flagship device to the budget tier. Our mobile app developers in New York understand the specific demands of the Android market in the US and build accordingly.
Flutter · Dart 3 · Material 3 · Feature Flags
Flutter App Development
Flutter lets enterprises ship a single, beautiful, high-performance codebase to iOS, Android, web, and desktop simultaneously. Our Flutter mobile app development services use Dart 3, Material 3 design components, and a modular feature-flag architecture that lets product teams iterate without full releases. For New York enterprises managing multiple brands or product lines, Flutter cuts development cost significantly while maintaining native-quality performance. Cross-platform mobile app development services in NYC don't require compromise when you build with the right team and the right framework.
React Native · Expo · TypeScript · Native Modules
React Native App Development
Our React Native experts in NYC bring enterprise discipline to JavaScript-based cross-platform development. We use Expo for managed workflows, integrate with native modules where performance demands it, and apply the same compliance and security standards we apply to fully native projects. React Native is particularly well-suited to enterprises that already operate a JavaScript-heavy backend or product organisation, since it enables full-stack engineers to contribute meaningfully to the mobile layer.
Apple Watch · Wear OS · Fitbit · IoT Wearables
Wearable App Development
Wearables are no longer a novelty in enterprise environments — they're a data collection channel, a patient monitoring interface, and an operational tool. Our end-to-end wearable app development solutions cover Apple Watch, Wear OS, Fitbit, and custom IoT-connected wearables. We've built wearable apps for healthcare providers in New York that sync with Electronic Health Record systems in real time, and for logistics operators that use wrist-worn devices for hands-free warehouse management.
Next.js · Node.js · Docker · Kubernetes · Cloud-Native
Web Application Development
Our web application development practice covers progressive web apps, single-page applications, and enterprise portals built with Next.js and Node.js. We architect web apps to be cloud-native from day one — containerised with Docker, orchestrated with Kubernetes, and deployed across AWS, Azure, or GCP depending on your existing infrastructure. For enterprise clients who need a consistent experience across web and mobile, we design shared component libraries and unified design systems that eliminate redundant work.
PWA · Service Workers · Offline-First · <2s Load
Progressive Web App (PWA) Development
Our Progressive Web App services close the gap between web and native without requiring users to install anything. Our PWA builds are indexed by Google, work offline via service workers, support push notifications, and load in under 2 seconds on 4G — a critical benchmark for New York's mobile-first users who have zero patience for slow load times. PWAs are an especially strong choice for eCommerce and media clients who need to reach the widest possible audience at the lowest acquisition cost.
Ethereum · Polygon · Solana · Smart Contract Audits
dApp Development
As a trusted app development firm in New York with a dedicated Web3 practice, we build decentralised applications on Ethereum, Polygon, and Solana. Our dApp development work covers DeFi protocols, NFT marketplaces, tokenised asset platforms, and blockchain-based supply chain systems. We implement smart contract audits, multi-signature wallets, and on-chain governance mechanisms. New York's financial sector has been among the earliest institutional adopters of blockchain infrastructure, and KKRF Tech has been at that table since the beginning.