Software Developer with 10+ year of experience as a Full Stack/Backend Development.
Working with flutter on a daily basis since 1.0 was release and my primary focus on Upwork is to work only with Flutter.
Experienced with:
- BLoC, Provider
- RxDart
- Localization
- Firebase, Firestore
- Push notifications
- REST Api
- test (unit, widget and integration)
- a lot of Flutter packages
Flutter
Girish N.
Noida, India
$15/hr
5.0
14 jobs
✔Top Rated Plus Mobile App Developer | iOS | Flutter | Android | React Native
✔Expert in Bug Fixing, App Performance, BLE, IoT & Scalable Mobile Apps
✔With 12+ years of experience in iOS and 5+ years in Flutter
I help startups build high-quality mobile apps (iOS & Android) with clean UI and fast performance. I have built 80+ apps including AI-based and SaaS platforms
Many apps work fine at the start but later run into problems like slow speed, crashes, or hard-to-manage code. Most of the time, the real issue is not just development , it’s how the app is structured from the beginning.
I focus on creating strong, clean architecture and improving existing apps so they stay fast, stable, and easy to scale over time.
I help businesses fix, build, and scale mobile apps that are fast, stable, and ready for production. If your app has bugs, crashes, or performance issues , I can quickly diagnose and resolve them.
I specialize in building high-performance mobile applications using Flutter, Swift, Kotlin, and React Native. I focus on clean architecture, scalable backend integration, and seamless user experience
✔SERVICES I OFFER
• Mobile App Development (iOS, Android, Flutter, React Native)
• Bug Fixing, Crash Resolution & App Debugging
• App Performance Optimization & Speed Improvement
• Upgrade & Maintenance of Existing Apps
• API Integration & Backend Development
• UI/UX Implementation (Figma, Adobe XD)
• App Store & Google Play Store Deployment.
✔KEY SKILLS:
Flutter Developer | iOS Developer | Android Developer
Swift | SwiftUI | Kotlin | Dart | React Native
Firebase | Node.js | Laravel | REST API | GraphQL
BLE | Bluetooth | IoT | ESP32 | MQTT
Stripe | Razorpay | Apple Pay | Google Pay | In-App Purchase
WebRTC | Agora | Real-time Chat | Video Calling
AWS | CI/CD | Git | Sentry | TestFlight | Play Console
Achievements
✔ 2M+ Downloads Mobile Application Delivered
✔ 1M+ Users Healthcare Platform
✔ IoT System Deployed in 125+ Stores
✔ Multiple Apps Successfully Published on App Store & Play Store
WHY HIRE ME
• Fast turnaround for bug fixing & urgent issues
• Clean, scalable, and production-ready code
• Strong communication & regular updates
• 100% focus on client satisfaction and long-term support
Let’s discuss your project.
Send me a message with your app details , I’ll suggest the best solution quickly.
Flutter
Firebase
Mobile App Development
iOS Development
FlutterFlow
Bluetooth LE
SwiftUI
macOS
Swift
AI Development
Android App Development
AI Chatbot
React Native
PHP
Node.js
Machine Learning
Kotlin
BLEN
Apple Watch
AWS IoT Core
Vijay K.
Noida, India
$15/hr
4.1
7 jobs
🌟 Whether you're a 𝗦𝘁𝗮𝗿𝘁𝘂𝗽 extraordinaire, an 𝗘𝘀𝘁𝗮𝗯𝗹𝗶𝘀𝗵𝗲𝗱 𝗕𝘂𝘀𝗶𝗻𝗲𝘀𝘀 maven, or simply on the prowl for 𝗠𝗩𝗣 domination, you've found the ultimate source of 𝗛𝗶𝗴𝗵-𝗤𝘂𝗮𝗹𝗶𝘁𝘆 𝗦𝗲𝗿𝘃𝗶𝗰𝗲𝘀 at prices that won't give you sticker shock
👋Hello! I’m Vijay Kunal, 📱 a mobile app developer with 6+ years’ experience in iOS, Android, and Flutter. I create user-centric solutions that drive business growth across diverse industries.
🛎️ 𝗙𝗶𝗻𝘁𝗲𝗰𝗵 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝘆: Payment app, Budgeting app
🛎️ 𝗛𝗲𝗮𝗹𝘁𝗵𝗰𝗮𝗿𝗲 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝘆: Telemedicine app, Health records flutter app
🛎️ 𝗘-𝗰𝗼𝗺𝗺𝗲𝗿𝗰𝗲 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝘆: Shopping app, Delivery tracking flutter app
🛎️ 𝗥𝗲𝗮𝗹 𝗘𝘀𝘁𝗮𝘁𝗲 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝘆: Property listing app, Mortgage calculator flutter app
🛎️ 𝗘𝗱𝘂𝗰𝗮𝘁𝗶𝗼𝗻 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝘆: E-learning app, Quiz and assessment flutter app
🛎️ 𝗧𝗿𝗮𝘃𝗲𝗹 𝗮𝗻𝗱 𝗧𝗼𝘂𝗿𝗶𝘀𝗺 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝘆: Travel booking app, Tour guide flutter app
🛎️ 𝗙𝗼𝗼𝗱 𝗮𝗻𝗱 𝗥𝗲𝘀𝘁𝗮𝘂𝗿𝗮𝗻𝘁 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝘆: Food delivery app, Table reservation flutter app
🛎️ 𝗘𝗻𝘁𝗲𝗿𝘁𝗮𝗶𝗻𝗺𝗲𝗻𝘁 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝘆: Streaming app, Event ticketing flutter app
🛎️ 𝗔𝘂𝘁𝗼𝗺𝗼𝘁𝗶𝘃𝗲 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝘆: Car rental app, Vehicle tracking flutter app
🛎️ 𝗙𝗶𝘁𝗻𝗲𝘀𝘀 𝗮𝗻𝗱 𝗪𝗲𝗹𝗹𝗻𝗲𝘀𝘀 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝘆: Workout app, Nutrition tracking flutter app
🛎️ 𝗦𝗼𝗰𝗶𝗮𝗹 𝗡𝗲𝘁𝘄𝗼𝗿𝗸𝗶𝗻𝗴: Social media app, Dating flutter app
🛎️ 𝗧𝗿𝗮𝗻𝘀𝗽𝗼𝗿𝘁𝗮𝘁𝗶𝗼𝗻 𝗮𝗻𝗱 𝗟𝗼𝗴𝗶𝘀𝘁𝗶𝗰𝘀: Shipping and tracking app, Fleet management flutter app
🛎️ 𝗔𝗴𝗿𝗶𝗰𝘂𝗹𝘁𝘂𝗿𝗲: Crop management app, Weather forecasting flutter app
🛎️ 𝗠𝗮𝗻𝘂𝗳𝗮𝗰𝘁𝘂𝗿𝗶𝗻𝗴: Inventory management app, Quality control flutter app
🛎️ 𝗜𝗼𝗧 (𝗜𝗻𝘁𝗲𝗿𝗻𝗲𝘁 𝗼𝗳 𝗧𝗵𝗶𝗻𝗴𝘀) 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝘆: IoT monitoring and control flutter app
🛎️ 𝗕𝗹𝘂𝗲𝘁𝗼𝗼𝘁𝗵 𝗔𝗽𝗽 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁: Bluetooth-based smart device control flutter app
🛎️ 𝗡𝗙𝗖 (𝗡𝗲𝗮𝗿 𝗙𝗶𝗲𝗹𝗱 𝗖𝗼𝗺𝗺𝘂𝗻𝗶𝗰𝗮𝘁𝗶𝗼𝗻) 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝘆: Mobile payment and contactless communication flutter app
🛎️ 𝗛𝗜𝗣𝗔𝗔 𝗖𝗼𝗺𝗽𝗹𝗶𝗮𝗻𝗰𝗲-𝗕𝗮𝘀𝗲𝗱 𝗛𝗲𝗮𝗹𝘁𝗵 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝘆: Electronic health records (EHR) flutter app
𝗠𝘆 𝐓𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝗦𝘁𝗿𝗲𝗻𝗴𝘁𝗵𝘀 𝗮𝗻𝗱 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲:-
✔Mobile App Development with React Native Developer, Flutter Developer, and Flutterflow App
✔𝐄𝐱𝐩𝐞𝐫𝐭 in designing and developing cross-platform 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩𝐬 𝐮𝐬𝐢𝐧𝐠 "𝐑𝐞𝐚𝐜𝐭 𝐍𝐚𝐭𝐢𝐯𝐞" & "𝐅𝐥𝐮𝐭𝐭𝐞𝐫", Dart.
✔5 + Years of experience with Native Mobile app Developer in Kotlin, Swift
✔6+ years of experience with 𝗥𝗲𝗮𝗰𝘁 𝗡𝗮𝘁𝗶𝘃𝗲, React Native developer/designer, Javascript, Typescript, React Native mobile app Developer React Native Expertise with Technical Skills:
✔React Native - React Native CLI, Expo - Redux, Axios, Async storage - Sockets, Cloud ✔Messaging, Chat, Camera, Video, Audio - VSCode, Android Studio, XCode.
✔5+ years with 𝗙𝗹𝘂𝘁𝘁𝗲𝗿, Flutter developer/designer, Flutter mobile app Developer
✔𝗪𝗲𝗯 / 𝗕𝗮𝗰𝗸𝗲𝗻𝗱(Dashboard): Solid knowledge of 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁, 𝗥𝗲𝗮𝗰𝘁𝗝𝘀, 𝗡𝗼𝗱𝗲𝗝𝘀, 𝗘𝘅𝗽𝗿𝗲𝘀𝘀𝗝𝘀, 𝗧𝘆𝗽𝗲𝘀𝗰𝗿𝗶𝗽𝘁, 𝗟𝗮𝗿𝗮𝘃𝗲𝗹, 𝗣𝗛𝗣, MERN Stack
✔Strong understanding of Native 𝗮𝗻𝗱 𝗛𝘆𝗯𝗿𝗶𝗱 𝗔𝗽𝗽 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁
✔𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗲 𝘁𝗵𝗶𝗿𝗱-𝗽𝗮𝗿𝘁𝘆 𝗔𝗣𝗜'𝘀
✔Familiar with Microservices like AWS
✔Knowledge of Database like MySQL, MongoDB, Redis, SQLite, Elasticsearch, PostgreSQL, etc.
✔Backend Brilliance - From API design to server-side languages like PHP, MERN Stack, Node.js and more.
✔𝗔𝗻𝗱𝗿𝗼𝗶𝗱: Kotlin, Java, Jetpack compose
✔𝗶𝗢𝗦: Swift, Objective-C, SwiftUI
✔𝗖𝗿𝗼𝘀𝘀-𝗽𝗹𝗮𝘁𝗳𝗼𝗿𝗺 (𝗛𝘆𝗯𝗿𝗶𝗱 APP): Flutter (Dart), React Native
✔𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲𝘀: SQLite, MySQL, MongoDB, PostgreSQL, Firebase Cloud Firestore - Firebase Realtime Database, Firebase Remote Config, Firebase Cloud Storage
✔𝗟𝗮𝘁𝗲𝘀𝘁 𝗧𝗿𝗲𝗻𝗱𝘀: Artificial Intelligence (AI), Augmented Reality (AR), Internet Of Things (IoT) Experience Mobile App Developer
Whether you are a 𝗦𝘁𝗮𝗿𝘁𝘂𝗽, 𝗘𝘀𝘁𝗮𝗯𝗹𝗶𝘀𝗵𝗲𝗱 𝗕𝘂𝘀𝗶𝗻𝗲𝘀𝘀 or looking for 𝗠𝗩𝗣, you will get 𝗛𝗶𝗴𝗵-𝗤𝘂𝗮𝗹𝗶𝘁𝘆 𝗦𝗲𝗿𝘃𝗶𝗰𝗲𝘀 at an 𝗔𝗳𝗳𝗼𝗿𝗱𝗮𝗯𝗹𝗲 𝗖𝗼𝘀𝘁, 𝗚𝘂𝗮𝗿𝗮𝗻𝘁𝗲𝗲𝗱.💯
Just click on the '𝗜𝗻𝘃𝗶𝘁𝗲 𝘁𝗼 𝗝𝗼𝗯' button and let’s discuss your project and your vision. 🤝
Flutter
Firebase
Hybrid App Development
Swift
Objective-C
Push Notifications
Chat & Messaging Software
iOS Development
In-App Purchases
Augmented Reality
Mac OS App Development
macOS
Google Maps API
iPhone
Swati V.
Noida, India
$16/hr
4.3
9 jobs
From the past 6 years, I have been building Apps & Games for iPhone, iPad and Android
- Java, Kotlin, Android SDK, Android Studio, I am expert in iOS SDK, SWIFT, Objective-C, and many more
- I have developed more than 50 apps and games so far
- I simply follow AGILE and SCRUM as an App Development Strategy
- I am adept at using various project management tools like Asana, Basecamp, Trello amongst various others
- I also love debugging and resolving errors /issues in any kind of App
I am firm at Native (Swift, Objective-C, Java & Kotlin) and Hybrid (Flutter) programming!
Fields of Development:-
- Restaurant Apps (Order Booking & Tracking)
- Taxi Booking App
- Social Networking/Dating
- Photo/Video Editing
- GPS
- Audio Apps (YouTube API)
- Streaming( audio & video)
- Cloud based mobile applications
Thanks
Flutter
Dart
Android SDK
Swift
iOS Development
Objective-C
Kotlin
Android Studio
Android App Development
API Integration
API
Apple Xcode
REST API
API Development
AI Mobile App Development
AI App Development
Java
React Native
Google APIs
Node.js
Pravin P.
Noida, India
$20/hr
4.9
133 jobs
🚀 Need an AI Developer who can build AI Agents, Voice AI solutions, AI Chatbots, SaaS platforms, or Mobile Apps?
I help startups, founders, and businesses transform ideas into production-ready AI products and scalable applications that drive real business results.
As a Top Rated Plus on Upwork, I specialize in building AI-powered software, intelligent automation systems, and cross-platform mobile applications that help companies launch faster, reduce operational costs, and improve customer experiences.
Whether you're building an AI startup, automating internal workflows, creating a customer-facing AI assistant, or developing your next SaaS platform, I can take your project from idea to launch.
What I Can Build
🤖 AI Development
AI Agents & Multi-Agent Systems
AI Assistants & AI Employees
AI Chatbots & Conversational AI
Voice AI Applications
AI Customer Support Systems
AI Sales & Lead Generation Agents
AI Workflow Automation
AI Document Processing
Retrieval-Augmented Generation (RAG)
Custom LLM Applications
💬 Large Language Models
OpenAI (GPT)
Claude
Gemini
Llama
Prompt Engineering
AI Integrations & APIs
📱 Mobile App Development
Flutter
React Native
Android
iOS
Firebase
Supabase
Offline-first Applications
Real-time Applications
💻 SaaS & Web Applications
Startup MVP Development
SaaS Platforms
Admin Dashboards
CRM Systems
ERP Solutions
Custom Business Applications
Backend Development
REST APIs & GraphQL
⚙️ Automation & AI Workflows
n8n Automation
Zapier
Makedotcom
Business Process Automation
AI Workflow Design
API Integrations
Third-party Integrations
☁️ Backend & Cloud
Node.js
Python
FastAPI
Firebase
Supabase
PostgreSQL
MongoDB
AWS
Docker
Industries I've Worked With
✔ Healthcare
✔ Logistics & Supply Chain
✔ Real Estate
✔ Education
✔ Fitness & Wellness
✔ E-commerce
✔ Finance
✔ Field Service Management
✔ AI SaaS Startups
How I Help Clients
I don't just write code—I solve business problems.
I help clients:
✅ Launch MVPs quickly to validate ideas
✅ Build scalable AI-powered products
✅ Automate repetitive business processes
✅ Integrate AI into existing software
✅ Improve customer engagement using AI
✅ Develop secure and scalable SaaS platforms
✅ Build production-ready mobile applications
From product strategy to deployment, I work closely with clients to ensure every solution is built for long-term growth, maintainability, and business impact.
Why Clients Choose Me
⭐ Top Rated Plus
⭐ Strong expertise in AI, Mobile Apps & SaaS Development
⭐ Clear communication and transparent project management
⭐ Clean, scalable, production-ready code
⭐ Fast turnaround without compromising quality
⭐ Long-term technical partner for startups and growing businesses
⭐ End-to-end product development from concept to launch
Recent Project Experience
• AI Agents for business automation
• Voice AI platforms with real-time conversations
• AI-powered customer support systems
• AI workflow automation solutions
• SaaS platforms for startups
• Logistics & operations management software
• Healthcare and fitness applications
• CRM & ERP solutions
• Flutter mobile applications for iOS & Android
My Technology Stack
Mobile: Flutter, React Native, Android, iOS
AI: GPT-powered AI, Leading Large Language Models (LLMs), Llama, LangChain, RA-G, Prompt Engineering
Backend: Node.js, Python, FastAPI
Database: Firebase, Supabase, PostgreSQL, MongoDB
Cloud: AWS, Docker
Automation: n8n, Zapier, Make Automation
Let's Build Something Great
If you're looking for an experienced AI Developer who can build AI Agents, Voice AI applications, SaaS platforms, or high-quality Flutter mobile apps, I'd love to help.
Send me a message with your idea, and I'll recommend the best technical approach, outline a scalable solution, and help turn your vision into a reliable, production-ready product.
Flutter
Dart
Firebase
Mobile App Development
Node.js
JavaScript
TypeScript
Android
Firebase Cloud Firestore
Android App Development
iOS Development
AI Mobile App Development
Front-End Development
AWS Lambda
AI Chatbot
AI App Development
AI Development
AI Agent Development
Vikas R.
Noida, India
$25/hr
4.9
81 jobs
🚀 Top Rated Full Stack & Flutter Developer | React, Node.js, Laravel & Shopify Expert
I help startups, agencies, and growing businesses build scalable mobile apps, web applications, SaaS platforms, and eCommerce solutions that are fast, reliable, and ready for growth.
With 13+ years of development experience, I've delivered projects ranging from Flutter mobile applications and React web platforms to Laravel backends, Shopify stores, and custom business solutions.
Whether you need a new product built from scratch, an existing application improved, or a dedicated developer to support your team, I can help.
✅ Core Expertise
Mobile Development
• Flutter (iOS & Android)
• Firebase & Supabase
• State Management (Riverpod, BLoC, GetX)
• Push Notifications
• Maps & Location Services
• Payment Gateway Integration
Frontend Development
• React.js
• Next.js
• TypeScript
• Tailwind CSS
• Responsive UI Development
• API Integration
Backend Development
• Node.js
• Laravel
• REST APIs
• MySQL
• PostgreSQL
• MongoDB
• Authentication & Security
• Third-Party Integrations
eCommerce & CMS
• Shopify Store Development
• Shopify Theme Customization
• Shopify Apps & Integrations
• WooCommerce
• WordPress Development
AI & Automation
• OpenAI / ChatGPT Integration
• AI-powered Applications
• Workflow Automation
• Custom Business Tools
Why Clients Hire Me
✔ Clean, maintainable code
✔ Strong communication
✔ Reliable delivery
✔ Long-term support
✔ Problem-solving mindset
✔ Full project ownership
I've worked with startups, agencies, and enterprise clients across industries including Real Estate, FinTech, Healthcare, Education, eCommerce, Logistics, and SaaS.
If you're looking for a developer who can handle both frontend and backend development while delivering high-quality results, let's discuss your project.
Flutter
Dart
Firebase
Mobile App Development
Shopify
PHP
WordPress
JavaScript
Next.js
React
Shopify Development
Full-Stack Development
SaaS
TypeScript
MongoDB
MySQL
Laravel
CodeIgniter
Node.js
OpenAI API
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