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Available for freelance & full-time roles

Photo of Biju DeyHello, I'm Biju Dey👋React NativeDeveloper & Engineer

I build fast, beautiful iOS & Android apps, the web platforms and backends behind them, and the cloud they run on, from planning to production. 4+ years shipping products people actually enjoy using.

Get In Touch Download Resume
View my work
  • React Native
  • Expo
  • TypeScript
  • Next.js
  • Node.js
  • WebRTC
  • Redis
  • GraphQL
  • Fastlane
  • Kafka
  • Docker
  • Kubernetes
  • AWS
  • DigitalOcean
  • OpenTelemetry
  • Sentry
  • PostHog
  • Grafana
  • Prometheus
  • Shopify
  • Socket.IO
  • MongoDB
  • OpenAI

About me

At the heart of every great app is a problem worth solving.

I'm Biju Dey, a React Native developer and full-stack engineer. For the past 4+ years I've helped take products from planning to production with teams at startups and businesses in the US and India: marketplaces, real-time chat & calling apps, Shopify mobile apps, e-commerce stores and AI assistants.

Frontend, backend, mobile and the infrastructure underneath (Docker, Kubernetes, AWS, Kafka), plus the observability (OpenTelemetry, Sentry, Grafana, PostHog) that keeps it healthy after launch. I care about the details users feel and the reliability teams depend on.

Based in Assam, India · Working with clients worldwide

Biju Dey, React Native Developer

Biju Dey

Open to work

4+

Years of experience

500%

Faster data layer

1K+

Daily real-time chats

What I do

Digital services I'm providing

From the first wireframe to the App Store listing: everything you need to launch and grow a modern mobile product.

  • Mobile App Development

    Cross-platform iOS & Android apps with React Native and Expo: native feel, one codebase, shipped to both stores.

    React NativeExpoiOSAndroid

  • Web & E-commerce

    Fast, SEO-friendly web apps, dashboards and custom storefronts with Next.js, React and Razorpay/Stripe payments.

    Next.jsReactPayments

  • Shopify Mobile Apps

    Native shopping apps powered by the Shopify Storefront API: real-time catalog sync, push campaigns and native checkout.

    ShopifyStorefront APIPush

  • Backend & Event Systems

    REST & real-time APIs, auth, databases and event-driven pipelines with Node.js, MongoDB, Kafka and Socket.IO.

    Node.jsKafkaMongoDB

  • Cloud & DevOps

    Containerised deployments on AWS and DigitalOcean with Docker, Kubernetes, Nginx and CI/CD pipelines that just work.

    AWSDockerKubernetes

  • Observability & Analytics

    See what production is doing: tracing with OpenTelemetry, errors in Sentry, metrics in Prometheus + Grafana, product analytics in PostHog.

    OpenTelemetrySentryPostHog

  • App Store & Play Store Launch

    Signing, builds, store listings, review guidelines and release tracks handled end-to-end, so your app actually ships.

    App StorePlay StoreEAS

  • AI Integration

    Chat, summarisation and smart features powered by OpenAI and Gemini APIs, wired cleanly into your product.

    OpenAIGeminiLLM

  • Real-time Features

    Live chat, presence, voice/video calling and notifications with Socket.IO, WebRTC and Firebase.

    Socket.IOWebRTCFirebase

Selected work

Products I've helped take from idea to launch

Marketplaces, real-time apps, Shopify SaaS and e-commerce, built with great teams, from planning to the app stores.

View all projects
Wenuru app screen 1Wenuru app screen 2Wenuru app screen 3Wenuru app screen 4
Mobile AppLiveTeam project

Wenuru

India's creative space marketplace

A two-sided marketplace where creators, photographers, podcasters and film crews discover and book verified studios, film cities, villas and shoot vehicles, by the hour.

iOS · Android · Web
Amigify app screen 1Amigify app screen 2
Mobile AppComing soonTeam project

Amigify

Someone to talk to, any hour

A companionship app connecting adults with verified, trained listeners over private chat, voice and video, plus a separate companion app for listeners to work flexible shifts and earn.

iOS · Android · Web
Dzine Your App app screen 1Dzine Your App app screen 2Dzine Your App app screen 3
Shopify AppLiveTeam project

Dzine Your App

Turn any Shopify store into native iOS & Android apps

iOS · Android · Web
Vaidban app screen 1Vaidban app screen 2Vaidban app screen 3
Shopify AppLiveTeam project

Vaidban

An Ayurvedic brand since 1992, now in your pocket

iOS · Android
vozzypolo.com
Vozzypolo: Karbi handloom, woven in the hills of Karbi Anglong
E-commerceLiveTeam project

Vozzypolo

Karbi handloom, woven in the hills of Karbi Anglong

Web

Career

Where I've been building

  1. Software Developer

    Trillies LLC

    Florida, US · Remote

    Jul 2023 - Present
    • Engineered AWhatsChat, a CRM integrating 5+ modules: real-time chat, video calling, workflows, AI messaging and scheduling.
    • Architected real-time communication handling 1,000+ daily interactions with Socket.IO and WebRTC.
    • Built backend workflows with Express.js, Redis and BullMQ to manage high-concurrency message queues.
    • Integrated Stripe Payments, Pabbly Webhooks and OneSignal to automate 100% of business logic and notifications.
    • Refactored the mobile architecture to cut build times, with 99.9% uptime for background tasks via Headless JS.
    • Owned the full SDLC, publishing 2+ releases to both the Google Play Store and Apple App Store.
    React NativeSocket.IOWebRTCExpress.jsRedisBullMQStripeHeadless JS

  2. Software Developer Intern

    KrazyTech Business Solutions

    Bangalore, India

    Feb 2023 - Jul 2023
    • Led development of a new SalesField mobile app with React Native and low-latency storage.
    • Achieved a 500% faster data retrieval by migrating the persistence layer from SQLite to Realm.
    • Authored custom Native Modules for image processing, cutting rendering latency by 50%.
    • Set up fully automated Fastlane CI/CD pipelines, reducing manual release time by 40%.
    • Implemented GraphQL APIs to optimise data fetching and reduce network payload size.
    React NativeRealmNative ModulesFastlaneGraphQL

  3. Software Developer (Freelance)

    Independent Consultant

    Assam, India

    Jan 2022 - Feb 2023
    • Built a full-stack School Management System with 5+ core modules: attendance, fees, records, notices and reports.
    • Digitised school records with data synchronisation and automated reporting for administration.
    Full-stackWeb AppAutomated Reporting

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

Toolbox

The stack behind the apps

Battle-tested tools across the whole stack, from the app on your phone to the cluster it talks to and the dashboards that watch it.

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↗

Planning → Production

Comfortable across the whole lifecycle

Frontend, backend, mobile, cloud and monitoring. I work alongside designers, product owners and fellow engineers from the first planning call to a stable, observable release on the web and both app stores.

FrontendBackendMobileCloud & DevOpsObservability
  1. 01Stage 1/6

    Plan

    Scope the problem, users and MVP. Define features, data model and a realistic release plan.

    DiscoveryUser flowsArchitectureEstimates
  2. 02Stage 2/6

    Design

    Wireframes to polished UI, design systems and prototypes you can click through before code.

    FigmaDesign systemPrototypes
  3. 03Stage 3/6

    Build

    Frontend, backend and mobile in one typed codebase, with weekly builds you can install on your phone.

    React NativeNext.jsNode.jsKafkaMongoDB
  4. 04Stage 4/6

    Ship

    Containerised, automated deploys to the cloud and signed releases to both app stores.

    DockerKubernetesAWSDigitalOceanApp StorePlay Store
  5. 05Stage 5/6

    Observe

    Tracing, error tracking, metrics and product analytics so problems surface before users notice.

    OpenTelemetrySentryGrafanaPrometheusPostHog
  6. 06Stage 6/6

    Scale

    Data-driven iteration, performance tuning and infrastructure that grows with your users.

    AutoscalingCachingEvent streamsA/B tests

Free developer tools

Little tools I built to save you time

Free, fast and private. Everything runs in your browser. Bookmark them for your next React Native or TypeScript project.

FAQ

Questions people often ask

Can't find what you're looking for? Send me a message and I'll get back to you.

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.

Let's work together

Got an idea? Let's turn it into an app people love.

Start a project biju64dey@gmail.com