React Native Engineer | Full-Stack Developer

Kamal Khastagir

Cross-Platform Mobile App Developer & Full-Stack Engineer building AI SaaS & Mobile Apps

View My Work

About

About Me

I'm a Full-Stack Mobile Engineer and React Native Developer with 3+ years of experience building high-performance iOS and Android applications alongside Next.js and NestJS backends. Currently, I work on a production SaaS platform, specializing in AI SaaS Integration and Multi-Provider LLM Orchestration (Anthropic, OpenAI, Gemini).

My core expertise lies in building complex Real-Time Systems and implementing Offline-First Architecture with robust Data Synchronization strategies. I have hands-on experience with native device capabilities like Geolocation/Google Maps API, Camera Integration, and deep performance tuning through Gesture Handling (Animated API) and Xcode Configuration.

I'm passionate about the entire product lifecycle — from Schema Design and Authentication Hardening to iOS/Android Build Automation. Whether it's configuring In-App Purchases / Payment Gateways or architecting a distributed backend, I take a structured approach to problem-solving, moving ideas from prototype to production seamlessly.

Kamal Khastagir

Work

What I've Worked On

Version-Controlled Artifact Storage

Added versioned S3 key tracking with on-demand upload and fallback resolution, cutting generation latency and covered with full-stack parity tests.

Multi-Provider LLM Abstraction

Unified Anthropic, OpenAI, Gemini, and Azure OpenAI behind a singleton client layer, normalising token usage across streaming and non-streaming paths.

Automated PDF Report Generation

Built rich, data-driven PDF exports — trend charts, revenue projections, competitor data — solving real pagination and layout edge cases.

Two-Token Session Architecture

Implemented access/refresh token session management with silent refresh-and-retry on expiry across a large Redux-Saga codebase.

Real-Time Messaging & Presence

Built WebSocket-powered chat with match-based session unlocking and live delivery for a social discovery app.

Invite & Referral Funnel

Built a cookie-based invite flow with edge middleware, threading invite state through pricing, CTAs, and onboarding without exposing it in the URL.

Location-Aware Discovery

Implemented proximity-based recommendation UI with swipe gestures, maps integration, and a coin-based premium unlock economy.

Security Hardening

Applied anti-enumeration patterns on auth endpoints, validated third-party SDK responses, and sanitised LLM-generated HTML/CSS to prevent XSS.

Admin Tooling & Observability

Built internal admin dashboards with Redis-cached stats, secure credential bootstrapping, and normalised logging across services.

Projects

Selected Work

LeanPath

AI-Powered Diet & Fitness App. A privacy-first, cross-platform mobile application that generates customized 7-day AI diet and workout plans, featuring advanced weight tracking graphs, Razorpay payments, and Google AdMob monetization.

Play Store

DigiQuick AI

AI SaaS Integration platform for generating digital products. Features Multi-Provider LLM Integration, dynamic Performance Optimization, and Authentication Hardening.

Live Demo

Otiumx – AI Journaling

AI-powered journaling app built with React.js. Features Real-Time Systems synchronization and secure user data management with careful Schema Design.

Live Demo

React Native Applications

Cross-platform mobile apps demonstrating Offline-First Architecture, robust Data Synchronization, Gesture Handling (Animated API), and Deep Linking.

GitHub

Delux Caterer Website

Business website for a real catering company based in my hometown, Kolkata, with over half a decade in the trade. Built with Next.js and SEO optimisation, deployed on Vercel.

Live Demo

Skills

What I Work With

Mobile Development

  • React Native & React Native CLI
  • Native Modules (iOS/Android)
  • Cross-Platform Development
  • Custom Native Components

Core Languages

  • TypeScript
  • JavaScript (ES6+)
  • HTML5
  • CSS3

State & Data Fetching

  • Redux Toolkit
  • TanStack Query (React Query)
  • Zustand
  • Context API

Offline-First & Storage

  • Offline-First Architecture
  • SQLite & MMKV
  • Background Sync
  • Local Caching

APIs & Real-Time

  • RESTful APIs & GraphQL
  • Socket.io & WebSockets
  • Real-Time Systems
  • Push Notifications (FCM)

Backend & Database

  • Next.js & NestJS
  • Node.js & PostgreSQL
  • Redis & Firebase
  • Multi-Provider LLM Integration

Deployment & Native Tooling

  • Xcode & TestFlight
  • App Store & Play Console Deployment
  • Git, GitHub Actions, CI/CD

Contact

Get In Touch

Feel free to reach out directly.

kamalkhastagir@gmail.com LinkedIn GitHub