Cross-platform mobile applications that run natively on iOS and Android from a single codebase. Built for startups, SaaS products, trading tools and internal business use — with full App Store and Google Play submission support included.
Building separate native iOS and Android apps doubles your engineering costs, splits your roadmap, and slows down feature iteration. Our custom mobile app development approach uses a unified single codebase to deliver high-performance apps that compile natively to both iOS and Android. This provides true native responsiveness, smooth 60 FPS animations, and full hardware device capabilities with significantly faster time-to-market and lower long-term maintenance overhead.
Built primarily with React Native, using both Expo and bare React Native depending on project requirements, we handle everything from native device integrations (push notifications, biometrics, camera, GPS, Bluetooth) to robust offline state caching and backend synchronization. We manage the entire lifecycle through App Store submission and Google Play approval. Every build comes with 100% source code ownership and zero platform licensing fees.
From single-codebase iOS and Android builds to native device integrations and full app store approvals.
How we designed and delivered a consumer-facing, AI-powered mobile application for iOS and Android.
Planning a group outing normally means juggling everyone's preferences, dietary needs, timing and budget across multiple apps and bookings by hand. Local restaurants and activity providers had no easy way to get discovered by planners or understand who was booking with them.
A mobile-first AI planning app ("Jaunt") where users add trip members, set meal timing, dietary restrictions, theme and budget, and receive an AI-generated multi-stop itinerary with bookings handled automatically. Built in React Native with a Django/AWS backend and an OpenAI-powered recommendation engine, paired with a business-side dashboard.
Consumers get personalized, ready-to-book outings in minutes instead of manually researching and coordinating across multiple apps. Venues gain a new discovery channel plus real operational analytics.
Answers to common questions regarding our mobile app engineering, React Native stack, store approvals, and code ownership.
Technical blueprints, architecture breakdowns and implementation guides from our engineering team.
Production architecture patterns and best practices for building scalable multi-tenant SaaS applications using Supabase RLS and the Next.js framework.
Master Next.js 16 Server Actions and React Server Components for building scalable real-time data synchronization pipelines with optimistic UI updates.
Whether you need a consumer-facing app or an internal mobile tool — tell us what you're building. We scope every project individually and provide fixed-price quotes within 24 hours.
Or email info@psi-square.net · Phone +44 (0) 20 3872 7195 · We reply within 24 hours · NDA available on request