AVAILABLE FOR WORK · KOLKATA, IN

Swaraj
Kumar.

Senior Flutter developer crafting production-grade mobile apps.

Real-timeWebRTCOffline-firstAI/OCR
● Start a projectView work ↓
0+
Years building
0+
Apps shipped
0
Companies
0
Domains worked
01 /

About

~/about.md

I'm a Senior Flutter Developer with 5+ years of experience architecting production-grade mobile applications for Android and iOS. I specialize in Clean Architecture, BLoC, and real-time systems — the kind of apps where state management, performance, and reliability actually matter.

My work spans eCommerce, social media, fintech, AI products, learning platforms, and content streaming. I've shipped apps with WebRTC audio/video calling, offline-first sync, OCR pipelines, and AI-driven categorization — typically working from product spec through to App Store / Play Store release.

I care about clean, maintainable code, smooth performance, and modern UI/UX. When something feels janky, I'll dig into the frame budget until it doesn't. When an architecture starts creaking under scale, I'll refactor toward modular, testable boundaries.

name
Swaraj Kumar
role
Senior Flutter Developer
location
Kolkata, India 🇮🇳
experience
5+ years · production
primary_stack
Flutter · Dart · BLoC
domains
eCommerce · Social · Fintech · AI · EdTech · Streaming
status
▸ available for full-time / contract
02 /

Skills

~/stack.yml

Mobile

  • Flutter
  • Dart
  • Cross-Platform
  • Android
  • iOS

Architecture

  • Clean Architecture
  • Domain-Driven Design
  • BLoC
  • GetX
  • Modular Dev

Backend & APIs

  • REST APIs
  • Firebase
  • Firestore
  • Cloud Functions
  • WebSocket
  • Auth Systems

Real-Time

  • WebRTC A/V Calling
  • VoIP Notifications
  • Real-Time Chat
  • Offline-First Sync
  • Media Streaming

Advanced

  • OCR Integration
  • QR Scanning
  • AI Features
  • Push Notifications
  • Face Recognition

Performance

  • App Optimization
  • Crashlytics
  • Firebase Analytics
  • Debugging
  • Scalability

Flutter Ecosystem

  • AutoRoute
  • Dio
  • Freezed
  • build_runner
  • Drift / SQLite

Engineering

  • Software Architecture
  • API Integration
  • Agile
  • Code Refactoring
  • Tech Docs
03 /

Featured Work

~/work/featured
FEATURED · 01

Totalher.

Female-only social media · WebRTC

A safe-space social platform with real-time messaging, audio/video calls, face recognition for sign-up verification, and VoIP push notifications that wake the app instantly for incoming calls.

FlutterBLoCDDDWebRTCCallKitFirebase
role
Lead Flutter Developer — architected the call stack and chat layer end-to-end.
challenges
Reliable WebRTC across iOS PushKit + Android backgrounded states. Face-recognition gated onboarding without leaking PII. Sub-150ms message delivery over flaky networks.
outcomes
Stable 1:1 + group video at scale, p95 call connect under 2s, VoIP wake-up working through Doze and Low-Power modes. Domain-Driven boundaries kept the auth + call + chat domains independently testable.
timeline
2023 — 2024
9:41
totalher
✦
🔔
user_1
user_2
user_3
user_4
user_5
M
Incoming video call · WebRTC
Maya Chen
✕
📹
aria.k
· 2h
"safe space ✨"
♡ 2.4k💬 184↗ 92
FEATURED · 02

Sellet.

B2B eCommerce mobile app · Toy distribution

A wholesale catalog and order-management app for toy retailers. WordPress eCommerce back-end, GetX-driven state, Firebase push for order status, and a UX tuned for one-handed bulk ordering.

FlutterGetXFirebaseDioFreezedWordPress API
role
Flutter Developer — built the buyer-facing app from scratch on top of an existing WordPress catalog.
challenges
Mapping a flexible WordPress eCommerce REST schema into a typed Dart domain. Bulk-order UX with MOQ rules, tiered pricing, and offline cart resilience.
outcomes
Shipped a buyer app that turned a slow web checkout into a sub-2-tap reorder flow, dropped support tickets by handling bulk pricing client-side, and standardized DTO generation with Freezed + build_runner.
timeline
2021 — 2022
9:41
Welcome back
Toyland Distributors
T
⌕ Search 12,540 SKUs…
WHOLESALE · BULK
Diwali Festival
Stock 25% Off
🧸
All
Plush
Cars
Dolls
Edu
Plush Tiger
₹240
MOQ 24
Dino Set
₹185
MOQ 50
RC Truck
₹420
MOQ 12
Doll Kit
₹320
MOQ 18
FEATURED · 03

Reveal Inside.

News reels · Offline-first

A vertical infinite-scroll news experience — TikTok pacing, NYT depth. Drift-backed offline cache, smooth pre-fetched media, and a feed engine that survives subway-tunnel commutes.

FlutterGetXSQLiteDriftFirebaseFirestore
role
Software Developer — owned the feed runtime, offline sync, and media prefetch pipeline.
challenges
Memory-stable vertical pager handling 100+ articles in a session. Conflict-free sync between Firestore and a local Drift store. Image prefetch without thrashing battery.
outcomes
Feed scrolls at 120 FPS on supported devices, fully usable in airplane mode after initial sync, and the per-article surface area now hosts other content types (videos, podcasts) without touching the runtime.
timeline
2022 — 2023
9:41
LIVE
OFFLINE READY ✓
🌋
WORLD
Volcanic activity in Iceland forces 4,000 to evacuate overnight
Reuters · 12 min ago · 4 min read
♡
12k
💬
847
↗
Share
⌄
Save
↑ swipe for next
04 /

More Projects

~/work/all
Tutor booking platform

Connectbud

Connects students with tutors. Real-time chat, booking calendar, push notifications, scalable WebSocket-backed architecture.

FlutterBLoCClean ArchAutoRouteFirebaseWebSocket
AI expense tracker

Smart Receipt

OCR-based receipt scanning, QR scanning, AI-driven category classification, and expense analytics for solo operators.

FlutterBLoCOCRAIFirebase
Stock-market learning

Art of Option

Video-based trading courses, structured curriculum, analytics, scalable app architecture. Built for a learning audience that needed clean playback and progress tracking.

FlutterGetXFirestoreCloud FunctionsDio
Postcards · delivery tracking

WITI

Design-your-own postcards from templates, mail them physically, track delivery in real time. A surprisingly hard product behind a simple UI.

FlutterBLoCDDDFirebase
Religious streaming

Catholic

Prayer content, radio streaming, music/video playback, episodic content delivery. Singpass auth integration for verified parish accounts.

FlutterButterFirestoreCloud Functions
Personal · content generator

Meme & Quote Maker

Instagram-style template-driven generator for quote posts, memes, and collages with export-ready layouts. A weekend project that became a daily tool.

FlutterCanvasImage pipeline
05 /

Experience

~/timeline.log
2024 — Present

NextZen Minds

Software Developer
  • Building scalable, production-grade Flutter applications with Clean Architecture and BLoC
  • Developing real-time features, media streaming systems, and template-based user experiences
  • Integrating Firebase services — Firestore, Cloud Functions, Analytics, Crashlytics, Push Notifications
  • Working on performance optimization, modular architecture, and advanced authentication systems
FlutterDartBLoCClean ArchitectureAutoRouteFirebaseFirestoreCloud FunctionsDioFreezed
2023 — 2024

Cbnits India Pvt. Ltd

Flutter Developer
  • Developed large-scale cross-platform apps with real-time communication features
  • Implemented WebRTC audio/video calling and WebSocket-based chat systems
  • Integrated OCR, AI-powered functionality, face recognition, and VoIP notifications
  • Drove app performance, maintainability, and reusable architecture patterns
FlutterDartBLoCDDDAutoRouteFirebaseWebRTCWebSocketDioFreezed
2022 — 2023

Saasaki Technologies Pvt. Ltd

Software Developer
  • Developed cross-platform apps focused on content delivery and learning experiences
  • Implemented offline-first architecture and smooth infinite-scrolling experiences
  • Integrated Firebase services, analytics, notifications, and local database sync
  • Worked on scalable mobile architecture and optimized app performance
FlutterDartGetXFirebaseFirestoreSQLiteDriftDioFreezed
2021 — 2022

Teramars Technologies Pvt. Ltd

Flutter Developer
  • Developed scalable eCommerce mobile applications with REST integrations
  • Integrated Firebase services and push notification systems
  • Delivered clean UI implementation and performance optimization
  • Focused on maintainable Flutter architecture and reusable code
FlutterDartGetXFirebaseWordPress APIsDioFreezed
06 /

Kind Words

~/refs.json
“

Swaraj rebuilt our WebRTC call stack in three sprints and cut connect time in half. He's the rare Flutter dev who actually understands platform channels and native lifecycles — not just the framework.

E
Engineering Lead
Cbnits India
“

He owns problems end-to-end. Spec to App Store, with clean code, tests, and CI handoffs you don't have to babysit. Our offline-first feed is still running on the architecture he designed.

P
Product Manager
Saasaki Technologies
“

Calm under pressure, sharp on architecture decisions, and writes commits that read like documentation. Anyone hiring senior Flutter — start with Swaraj.

S
Senior Developer
NextZen Minds
07 /

Get in touch

~/contact
▸ LET'S BUILD SOMETHING

Have an app idea
that needs a builder?

Open to senior Flutter roles, contract work, and interesting architecture problems. Drop a line — I usually reply within a day.

email
swaraj344@gmail.com
phone
+91 87098 30719
linkedin
/in/swaraj-kumar
location
Kolkata, India
● Send an email