# Biju Dey

> Biju Dey is a React Native developer and full-stack engineer from Assam, India with 4+ years building cross-platform mobile apps, real-time systems (Socket.IO, WebRTC) and backends, shipped to the App Store and Google Play.

Biju Dey is a React Native developer & full-stack engineer based in Assam, India, with 4+ years of experience. He builds cross-platform iOS and Android apps with React Native and Expo, plus the web platforms, backends and cloud infrastructure behind them, and works with teams from planning to App Store and Play Store release.

- Website: https://bijudey.dev
- Email: biju64dey@gmail.com
- LinkedIn: https://www.linkedin.com/in/biju-dey-bb2447236/
- GitHub: https://github.com/BijuDey
- Resume (PDF): https://bijudey.dev/Biju-Dey-Resume.pdf
- Availability: open to freelance projects and full-time remote roles (contact: https://bijudey.dev/contact)

## Experience

- **Software Developer, Trillies LLC** (Jul 2023 - Present, Florida, US · Remote): Engineered AWhatsChat, a CRM integrating 5+ modules: real-time chat, video calling, workflows, AI messaging and scheduling.
- **Software Developer Intern, KrazyTech Business Solutions** (Feb 2023 - Jul 2023, Bangalore, India): Led development of a new SalesField mobile app with React Native and low-latency storage.
- **Software Developer (Freelance), Independent Consultant** (Jan 2022 - Feb 2023, Assam, India): Built a full-stack School Management System with 5+ core modules: attendance, fees, records, notices and reports.
- **Education:** B.Tech in Computer Science & Engineering, Assam Downtown University, Guwahati (2021 - 2023, completed 5th semester)
- **Languages:** English (Proficient), Assamese (Advanced), Hindi, Bengali, Karbi (Intermediate)

## Skills

- **Mobile:** React Native, Expo / EAS, Native Modules, Headless JS, Redux / Context API, Jest & Detox
- **Frontend:** React, Next.js, TypeScript, Tailwind CSS, Framer Motion, Shopify Storefront
- **Backend & API:** Node.js / Express.js, GraphQL & REST, Socket.IO / WebSockets, WebRTC, WhatsApp Business API, OAuth 2.0
- **Data & Messaging:** MongoDB, PostgreSQL, Redis, Realm / SQLite, BullMQ / RabbitMQ, Kafka
- **Cloud & DevOps:** AWS (S3, EC2), DigitalOcean, Docker, Kubernetes, Nginx, Fastlane CI/CD
- **Observability & Ship:** OpenTelemetry, Sentry, PostHog, Grafana / Prometheus, App Store Connect, Google Play Console

## Services

- **Mobile App Development:** Cross-platform iOS & Android apps with React Native and Expo: native feel, one codebase, shipped to both stores.
- **Web & E-commerce:** Fast, SEO-friendly web apps, dashboards and custom storefronts with Next.js, React and Razorpay/Stripe payments.
- **Shopify Mobile Apps:** Native shopping apps powered by the Shopify Storefront API: real-time catalog sync, push campaigns and native checkout.
- **Backend & Event Systems:** REST & real-time APIs, auth, databases and event-driven pipelines with Node.js, MongoDB, Kafka and Socket.IO.
- **Cloud & DevOps:** Containerised deployments on AWS and DigitalOcean with Docker, Kubernetes, Nginx and CI/CD pipelines that just work.
- **Observability & Analytics:** See what production is doing: tracing with OpenTelemetry, errors in Sentry, metrics in Prometheus + Grafana, product analytics in PostHog.
- **App Store & Play Store Launch:** Signing, builds, store listings, review guidelines and release tracks handled end-to-end, so your app actually ships.
- **AI Integration:** Chat, summarisation and smart features powered by OpenAI and Gemini APIs, wired cleanly into your product.
- **Real-time Features:** Live chat, presence, voice/video calling and notifications with Socket.IO, WebRTC and Firebase.

## Key pages

- [Home](https://bijudey.dev): overview, services, selected work, experience and FAQ
- [Projects](https://bijudey.dev/projects): all case studies and client work
- [Blog](https://bijudey.dev/blog): articles on React Native, AI-assisted development and mobile engineering
- [Contact](https://bijudey.dev/contact): hire Biju for freelance or full-time work
- [Free developer tools](https://bijudey.dev/tools)

## Case studies

- [Wenuru](https://bijudey.dev/projects/wenuru): India's creative space marketplace. Mobile App, iOS/Android/Web. Built with the Wenuru team: designers, developers and the product owners.
- [Amigify](https://bijudey.dev/projects/amigify): Someone to talk to, any hour. Mobile App, iOS/Android/Web. A team effort. I worked alongside the founders, designers and other engineers.
- [Dzine Your App](https://bijudey.dev/projects/dzine-your-app): Turn any Shopify store into native iOS & Android apps. Shopify App, iOS/Android/Web. Built by the Dzine Your App team. I'm one of the engineers on it.
- [Vaidban](https://bijudey.dev/projects/vaidban): An Ayurvedic brand since 1992, now in your pocket. Shopify App, iOS/Android. Delivered with our team for Vaidban Ayurved Bhawan.
- [Vozzypolo](https://bijudey.dev/projects/vozzypolo): Karbi handloom, woven in the hills of Karbi Anglong. E-commerce, Web. Built in collaboration with the Vozzypolo team.
- AWhatsChat (Trillies LLC): A CRM built around WhatsApp-style conversations, bringing 5+ modules together: real-time chat, video calling, workflows, AI messaging and scheduling, handling 1,000+ daily interactions.
- School Management System (Freelance): A full-stack school management platform with attendance, fees, records, notices and reports, digitising records with synchronised data and automated reporting for administration.

## Blog posts

- [On-Device AI in React Native: What Actually Works in 2026](https://bijudey.dev/blog/on-device-ai-react-native-2026): A practical guide to running AI on the phone in React Native: Apple Foundation Models, Gemini Nano, ExecuTorch and llama.rn, with real speed and size numbers.
- [I Don't Ship AI Code I Can't Explain](https://bijudey.dev/blog/dont-ship-ai-code-you-cant-explain): AI coding agents in 2026 are fast and really good. Here's why I still read, review and hand-test what they write, backed by 2026 studies and surveys.

## Free tools

- [React Native Shadow Generator](https://bijudey.dev/tools/react-native-shadow-generator): Design shadows visually and copy cross-platform iOS + Android style code.
- [JSON → TypeScript](https://bijudey.dev/tools/json-to-typescript): Paste an API response, get clean TypeScript interfaces instantly.
- [Color Converter](https://bijudey.dev/tools/color-converter): HEX ↔ RGB ↔ HSL with alpha, plus React Native & Tailwind snippets.

## FAQ

**Who is Biju Dey?**
Biju Dey is a React Native developer and full-stack engineer from Assam, India with 4+ years of experience. He works as a Software Developer at Trillies LLC (US, remote), where he engineered AWhatsChat, a CRM with real-time chat, video calling and AI messaging, and has shipped apps to both the App Store and Google Play.

**Is Biju Dey available for freelance or full-time React Native work?**
Yes. Biju takes on freelance React Native, Next.js and full-stack projects and is open to full-time remote roles. Use the contact page to share your project details.

**Can you handle deployment, DevOps and the App Store / Play Store release?**
Yes, end to end. Biju containerises and deploys backends on AWS or DigitalOcean with Docker and Kubernetes, sets up observability with OpenTelemetry, Sentry, Prometheus, Grafana and PostHog, and manages App Store Connect and Google Play Console releases.

**What kind of apps has Biju worked on?**
As part of product teams: marketplaces and booking platforms (Wenuru), real-time chat and calling apps (Amigify), Shopify mobile apps and SaaS (Dzine Your App, Vaidban), custom e-commerce stores (Vozzypolo), AI assistants and offline-first field-sales tools.

**Can I download Biju Dey's resume?**
Yes. Use the “Resume” button in the navigation or hero section to download the latest PDF.

## Optional

- [Full text version](https://bijudey.dev/llms-full.txt): complete case studies and articles in one file
- [Sitemap](https://bijudey.dev/sitemap.xml)