Web version

Nikita Bhattacharya

Senior Mobile App Developer

Kolkata, India • +91 98311 60472 • nikita.bhattacharya@hey.com • linkedin.com/in/nikita-bhattacharya • github.com/nikitabh

Portfolio: www.eliorexa.com/portfolio/mobile-app-developer-mid

Professional Summary

Mobile developer with 5 years shipping consumer apps at scale across Flutter, React Native and native Swift/Kotlin. Owns features end to end — REST/Firebase integration, offline-first sync, pixel-accurate UI and the App Store / Play Store release pipeline. Track record of measurable wins in crash-free rate, app size and frame performance, plus mentoring juniors and setting the bar on mobile code review.

Skills

Cross-platform: Flutter, Dart, React Native, TypeScript, Riverpod, Redux Toolkit

Native: Kotlin, Jetpack Compose, Swift, SwiftUI, Coroutines, Combine

Backend & data: Firebase (Firestore, FCM, Remote Config), REST APIs, GraphQL, Room, Realm, Offline sync

Delivery: Fastlane, GitHub Actions (CI/CD), Play Console, App Store Connect, Firebase Crashlytics, Sentry

Core Competencies

Flutter · React Native · Kotlin · Swift · REST APIs · Firebase · app-store deployment · offline-first · UI · performance · crash-free · mentoring

Work Experience

Senior Mobile Developer — Tarana Health

Aug 2022 – Present

Bengaluru

  • Own the patient companion app (Flutter) with 800k+ downloads and a 4.7★ rating; led a rewrite that raised the crash-free rate from 98.1% to 99.8%.
  • Re-architected the offline-first sync layer with a conflict-resolution queue, cutting failed writes 64% on flaky networks.
  • Reduced app size 22% (41MB → 32MB) and jank by deferring assets and migrating to Impeller, holding 60fps on mid-range Android.
  • Built a Fastlane + GitHub Actions release pipeline that shipped to both stores in one click, cutting release time from a day to 25 minutes.
  • Mentored 3 junior developers and authored the team's mobile code-review checklist, reducing post-release hotfixes 35%.

Mobile Developer — Frostbyte Studio

Jul 2020 – Jul 2022

Remote

  • Shipped a React Native fitness app to 250k+ users across iOS and Android, lifting D7 retention 18% via push-driven streaks on FCM.
  • Built native Kotlin and Swift modules for HealthKit and Google Fit, syncing 12M+ workout sessions through REST APIs.
  • Cut p95 screen-load time 40% by adding image caching and list virtualization, improving Play Store rating from 4.1★ to 4.6★.

Projects

Lumen — open-source Flutter UI kit — 3 apps

Accessible Material 3 component kit adopted across 3 internal apps.

  • Authored 30+ themeable, reduced-motion-safe widgets with golden tests; trimmed design-to-dev handoff time ~30%.

Tech: Flutter, UI, Accessibility

Interactive 3D Portfolio

WebGL portfolio built on Eliorexa, linked from this résumé.

  • Reactive three.js hero with scroll-driven sections, lazy-loaded and reduced-motion safe — LCP 1.2s, CLS 0.02 on mobile.

Tech: three.js, React, Performance

Education

B.E. Computer Science & Engineering

2020

Jadavpur University, Kolkata

First Class with Distinction

Certifications

  • Associate Android Developer — Google (2021)