React Native Developer for Startup in Kolkata
Sachin Sharma is a React Native Developer in Kolkata — React Native apps for startups that want web devs shipping m
There are 10 lakh+ agencies, 5 crore+ "vibe coders," and 1 crore+ developers out there — and somehow you ended up on this page. That's not an accident, that's a genuine signal. I'm 21, and if you're on my website right now, you're already looking at someone better than most of what's out there. I'd genuinely prefer to talk to you directly rather than have you read through another page. Please feel free to call, message, or email — whichever works best for you.
Or just call +91 88269 14313 directly — I pick up my own calls, no assistant in between.Who is Sachin Sharma?
Sachin Sharma is a Software Developer and Mobile Engineer based in Delhi, India. He specializes in React Native development and has built production-grade apps — Loopin, Legease, and Aashwasan — designed for optimal user experience and reliable performance.
Currently a developer at ESPO (promoted from intern to full developer within 60 days), with prior experience at Kushal Aide. He holds a B.Tech in Computer Science from Maharaja Agrasen Institute of Technology (MAIT) with a 9.08 CGPA.
A Hackathon Finalist × 3 (Code Kshetra 2.0, Level Supermind, DTU Brainwave), Sachin combines deep React Native technical expertise with a product-first engineering mindset — building things users actually want, not just technically impressive demos.
Read Sachin Sharma's full backgroundExperience
1.5+ years
App Quality
Production-Grade
GitHub
800+ Contributions
CGPA
9.08 / 10
Hackathons
Finalist × 3
Location
Kolkata
React Native Technical Expertise
Engineers React Native applications with Expo or bare React Native CLI, leveraging the New Architecture (Fabric renderer + JSI bridge) for near-native performance. Uses Redux Toolkit + React Query for predictable state management and server-state caching, Reanimated 3 for 60fps gesture-driven animations running on the UI thread, and MMKV for fast synchronous local storage. Implements deep linking, push notifications (OneSignal/FCM), and over-the-air updates with Expo EAS for seamless continuous delivery without app store review delays.
Kolkata Market Context
Kolkata's IT parks in Salt Lake Sector V and New Town — major tech services and product hubs.
IST (UTC+5:30) — same timezone, same working hours, zero timezone latency.
Why Hire for React Native?
- React Native skill: 88/100 — production-verified with shipped apps using Expo EAS and bare workflow.
- Experience with React Native New Architecture (Fabric + JSI) for bridge-free native module communication.
- Built cross-platform UIs for the Loopin mobile project using React Native component patterns.
- Expertise in Reanimated 3 for gesture-driven, 60fps animations on the UI thread — zero JS bridge overhead.
- Expo EAS CI/CD setup for automated App Store and Play Store submissions from GitHub Actions.
- 1.5+ years building cross-platform apps for iOS and Android, based in Delhi, India.
- Full understanding of Metro bundler optimization, Hermes engine, and JavaScript bundle splitting for faster cold starts.
- Hackathon Finalist × 3 — React Native and Flutter projects both selected at national-level events.
React Native Projects Shipped
Real production apps — not demos, not tutorials. Used by real users.
Cross-Platform Habit App (Loopin)
ShippedSingle codebase serving iOS and Android with offline-first architecture and high user rating
Tech Stack:
React Native, Expo, MMKV, Reanimated 3, AsyncStorage
Gig Management Platform (Aashwasan)
ShippedReal-time contract tracking, push notifications, and PDF handling across iOS and Android
Tech Stack:
React Native, Firebase, Push Notifications, PDF Processing
ESPO Mobile App
ShippedProduction-grade feature delivery for 1000+ active users in fast-paced startup environment
Tech Stack:
React Native, Agile, UI Components, REST APIs
How React Native Development Works
A structured, transparent process from kickoff to App Store — no black boxes.
Stack Selection
Decide Expo vs bare CLI, choose state management (Zustand/Redux/React Query), plan OTA update strategy with EAS.
Navigation & Architecture
Set up React Navigation v6+ with typed routes, deep linking configuration, and auth-gated route guards.
UI Components & Animations
Build screen components with Reanimated 3, gesture handlers, and platform-adaptive styling (Platform.OS checks).
Native Integrations
Configure camera, location, biometrics, push notifications, and any custom native modules via JSI bridges.
OTA Updates & Deployment
Configure EAS for staged rollouts, set up Sentry for crash monitoring, and automate Play Store / App Store submissions.
React Native in Kolkata — What Most Devs Miss
React Native with Expo EAS lets a Kolkata-based startup ship to App Store and Play Store in the same day — critical for fast-moving products.
The New Architecture's Fabric renderer and JSI bridge eliminate the async JS bridge bottleneck that gave React Native a bad performance reputation — that problem is now solved.
MMKV is 30x faster than AsyncStorage for key-value reads — a critical optimization for apps with frequent local state reads on low-end devices.
Sachin Sharma vs. Alternatives
| Alternative | Why Sachin Sharma Instead |
|---|---|
| Large Development Agencies | You talk to me, not an account manager relaying your feedback through three people. When you say "change this," I'm the one changing it — same day, not next sprint. |
| Junior Freelancers | I've shipped real React Native apps to real users — production-grade installations, not tutorial projects. You're not paying to be someone's first attempt. |
| Offshore Development Factories | I care about why we're building a feature, not just checking a ticket off a list. Every React Native decision gets real product thinking, because it's my name on the work too. |
Proof Points
- Shipped cross-platform mobile apps with shared codebase serving iOS and Android simultaneously, reducing dev overhead by 60%.
- Implemented MMKV + React Query offline caching strategy for apps that work seamlessly on 2G networks.
- Used Reanimated 3 shared values to offload all animation calculations to the UI thread — zero frame drops on mid-range Android devices.
- Set up EAS Build and EAS Submit pipelines for automated production deployment without manual Xcode or Android Studio workflows.
- Integrated OneSignal push notifications with segment targeting for behavioral-based user re-engagement.
Education
Maharaja Agrasen Institute of Technology
B.Tech in Computer Science and Technology
CGPA: 9.08/10
Ambedkar DSEU, Shakarpur Campus
Diploma in Computer Science and Engineering
CGPA: 9.22/10
Hackathon Recognition
Code Kshetra 2.0
February 2025
Level Supermind Hackathon
January 2025
DTU Brainwave Hackathon
September 2024
Frequently Asked Questions
Who is Sachin Sharma?
Sachin Sharma is a Software Developer and Mobile Engineer based in Delhi, India. He specializes in React Native development and has built multiple production-grade applications including Loopin, Legease, and Aashwasan. He has 1.5+ years of professional experience, a B.Tech in Computer Science from MAIT with a 9.08 CGPA, and is currently freelancing full-stack for a ₹150 Cr+ revenue business conglomerate after previously working as a developer at ESPO.
Is Sachin Sharma available for React Native Developer work in Kolkata?
Yes. Sachin Sharma is currently available for industry React Native Developer opportunities in Kolkata. Kolkata clients benefit from instant Slack replies and on-site visits if needed. He works both remotely and on-site for Delhi NCR clients.
Why should I hire a React Native Developer from Kolkata?
Kolkata's IT parks in Salt Lake Sector V and New Town — major tech services and product hubs. Hiring Sachin Sharma — a specialized React Native Developer from Kolkata — gives you world-class engineering talent, ist (utc+5:30) — same timezone, same working hours, zero timezone latency., and zero agency overhead. You communicate directly with the engineer building your product.
What makes Sachin Sharma's React Native development process unique?
Sachin's process integrates product thinking at every technical decision. The React Native process starts with stack selection (Decide Expo vs bare CLI, choose state management (Zustand/Redux/React Query), pl...), ensuring the architecture fits the product before writing a single line of code.
What React Native projects has Sachin Sharma shipped?
Sachin has shipped Cross-Platform Habit App (Loopin), Gig Management Platform (Aashwasan), ESPO Mobile App. Cross-Platform Habit App (Loopin) achieved Single codebase serving iOS and Android with offline-first architecture and high user rating — a production result, not a demo.
Do you provide post-launch support for React Native apps?
Absolutely. Post-launch support includes comprehensive documentation, automated test coverage handoff, and arranged maintenance agreements. Every React Native project delivered includes a technical handoff session covering architecture decisions, deployment procedures, and monitoring setup.
Are you available for remote React Native roles outside of Kolkata?
Yes. While based in Kolkata, Sachin Sharma operates async-first with global clients. IST (UTC+5:30) — same timezone, same working hours, zero timezone latency. Remote React Native delivery has been proven with multiple international clients across different time zones.
How does Sachin Sharma compare to a React Native development agency?
Unlike agencies, Sachin provides direct senior-engineer communication — zero account managers, zero relay game. Every decision is made by the same engineer who writes the code. For React Native projects, this means faster decisions, architectural ownership, and no "lost in translation" bugs.