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Sumanta D.
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Sumanta D.

Full stack developer | Flutter, React Native, MERN , AI, Python

Senior Mobile Developer | Flutter & React Native Specialist 🚀 Architecting Scalable Mobile & Full-Stack Solutions Since 2014 💼 12+ Years of Engineering Excellence | Enterprise & Startup Scale ⚡ Hyper-Responsive Communication — Clear, Direct, and Action-Oriented Hi, I’m Sumanta. As a Senior Mobile Developer and Full-Stack Engineer, I specialise in building high-performance, cross-platform mobile applications and robust web ecosystems that scale seamlessly with your business growth. Over the past 12 years, I have partnered with startups and established enterprises worldwide to translate complex product visions into production-ready software. Whether you need a crisp MVP built from the ground up or a complex technical audit to optimize an existing app's performance and state management, I deliver future-ready code that performs flawlessly across devices. Core Capabilities ––––––––––––– -- Cross-Platform & Native Mobile Engineering -- Frameworks: Flutter, React Native (High-performance, single-codebase solutions) -- Native Development: iOS (Swift, Objective-C) & Android (Kotlin, Java) -- Optimization: Offline-first caching, real-time data synchronization, and advanced state management (Riverpod, BLoC, Redux). -- Advanced Features: AI integrations, secure digital wallets, and custom API/hardware interactions. Full-Stack Web Ecosystems & Architecture –––––––––––––––––––––––––––––––––– -- Modern Frontends: React, Next.js, and responsive web frameworks. -- Scalable Backends: Node.js (MERN/MEAN), Python (Django/Flask), and Laravel. -- APIs & Data: Secure RESTful & GraphQL API design, Firebase, and Firestore integration. -- Content Management: Headless CMS architectures and custom WordPress solutions. Why Clients Partner With Me ––––––––––––––––––––––––– -- Architectural Integrity: I don't just write code; I design clean, maintainable software architectures that your team can scale for years to come. -- Transparent Communication: You will always know exactly where the project stands. I prioritize proactive updates and fast, 30-minute response windows. -- Product-Minded Approach: I look at your project through a business lens, ensuring the technical execution perfectly supports your user experience and retention goals. -- End-to-End Reliability: From deep technical discovery and initial build-ready designs to post-launch support and performance tuning, I am dedicated to your long-term success. Let's build an application that drives your business forward. Click the "Invite to Job" or "Message" button above, and let’s discuss your technical goals.

🇮🇳Kolkata, India$20/hr100% JSS4.85 (105)Since Mar 2014
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Earnings and projects

MRR
$11k

Last 6 months ÷ 6

World#1,001 / 412k
🇮🇳Country#70 / 45.9k
Revenue, last 30 days
$9k

Last 6 months: $66k

World#1,806 / 412k
🇮🇳Country#153 / 45.9k
Total earnings
$175k

Billed in all: $198k

World#18,764 / 412k
🇮🇳Country#3,066 / 45.9k
Per project
$1k

$3.9k in the last 6 months

World#122,017 / 412k
🇮🇳Country#15,311 / 45.9k
Projects, last 6 months
17

Across 19 contracts

100% fixed0% hourly
World#7,985 / 412k
🇮🇳Country#1,171 / 45.9k
Projects in all
171

Across 176 contracts

85% fixed15% hourly
World#12,851 / 412k
🇮🇳Country#2,409 / 45.9k

Earnings, last 30 days

$198k+$9k earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$185k$190k$195k$200kOct 8Oct 23Nov 7

Skill rankings: #1 in 3 skills of 20

Rarest: top 0.18% in Joomla, of 1,118. Ranked by MRR among everyone on Upwork with the skill.

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  2. 1Custom Content Management System166 freelancers · 🇮🇳 #1Top 0.60%
  3. 1phpBB38 freelancers · 🇮🇳 #1Top 3%
  4. 2Joomla1,118 freelancers · 🇮🇳 #2Top 0.18%
  5. 3OpenCart669 freelancers · 🇮🇳 #2Top 0.45%
  6. #5Magento2,249 freelancers · 🇮🇳 #2Top 0.22%
  7. #10Kotlin3,021 freelancers · 🇮🇳 #3Top 0.33%
  8. #17Ecommerce8,441 freelancers · 🇮🇳 #1Top 0.20%