React Native Developer in Bangladesh for AI-Powered Mobile Apps

Expo is my default. It gives one TypeScript codebase for iOS and Android, EAS Build and Submit for the stores, and over-the-air updates so a prompt or UI fix ships without waiting for review. On top of it I add the AI layer: streaming chat with the Vercel AI SDK, speech-to-text and text-to-speech for voice assistants, camera and image understanding, and hybrid on-device plus cloud inference where privacy or offline use matters.

Behind the app there is always a backend I build for you — usually NestJS on PostgreSQL — that holds the API keys, meters usage, caches expensive calls and keeps AI costs predictable. Subscriptions run through RevenueCat, StoreKit and Play Billing, and analytics and crash reporting are wired in before launch, not after.

Where the model runs is the first decision. Cloud models from OpenAI, Anthropic or Groq give the best quality and are right for most features. On-device models are right for transcription, classification, quick replies and anything that must work on a plane or never leave the phone. I usually build a small router that picks per request, so the app degrades gracefully when the network does.

Cost is the second decision. A mobile app can generate thousands of AI calls a day from users who pay a few dollars a month, so I design for it: caching, short prompts, cheaper models for cheap tasks, per-user limits, and a usage dashboard you can watch. Every package includes a running-cost estimate before you commit.

Iqtidah is a daily Sunnah tracker and prayer companion app I designed and shipped end to end, with a NestJS and PostgreSQL backend behind it. Virtual Client is a multi-tenant AI voice coaching platform where real-time speech, LLM feedback and tenant isolation had to work together. CakeOrFake is an AI-powered screening tool with subscription billing through RevenueCat and Stripe. The patterns — voice pipelines, metered AI, subscriptions — carry straight into a React Native app.

Starter is $1,299 over three to four weeks: up to six screens, one AI feature such as chat, voice or image understanding, a backend for AI calls, push notifications, auth and submission to both stores. Professional is $3,999 over six to nine weeks: up to fifteen screens, multiple AI features, streaming and background processing, in-app subscriptions, offline-first sync, analytics, OTA updates and CI/CD. Enterprise is $9,999 over ten to sixteen weeks with on-device inference, enterprise SSO, end-to-end encryption and a security review.

Agencies in Bangladesh quote $5,000-15,000 for a comparable app and US studios rarely start below $40,000 once AI is involved. Hourly work on an existing React Native codebase is $100-150 an hour.

I work in UTC+6 with a fixed weekly call inside your working day, TestFlight and internal-testing builds every week so you can hold the app in your hand as it grows, and a shared board for decisions. Payment is by milestone in USD via Wise, Payoneer or bank transfer, the code lives in your GitHub organisation, and the Apple and Google developer accounts are yours. Book a free 30-minute call and bring the app idea; I will tell you which features belong in version one.