I help startups and enterprises transform ideas into high-performance, scalable mobile applications that users love and businesses rely on.
With 10+ years of hands-on experience in iOS and Android development, I specialize in building secure, user-centric, and production-ready mobile apps from MVP to enterprise scale. My background in Agile project leadership ensures smooth execution, transparent communication, and on-time delivery.
Mobile Development Expertise
iOS Development
• Swift
• watchOS, SiriKit, HealthKit
• Apple Watch integrations
• App Store deployment & optimization
Android Development
• Kotlin
• Flutter & React Native (cross-platform)
• Google Play deployment
Wearables & IoT
• Fitbit, Garmin, Polar
• BLE (Bluetooth Low Energy) integrations
• Smart medical devices (BP monitors, Spirometers, Digital Stethoscopes)
Backend & Cloud Integration
• Node.js, PHP
• REST & SOAP APIs
• Firebase
• AWS & Azure cloud services
• Real-time systems (WebRTC, XMPP, VoIP)
• JSON / XML integrations
I ensure secure, scalable architecture aligned with HIPAA, GDPR, and PIPEDA compliance when handling sensitive user data.
Industry Experience
-HealthTech & Telehealth
-Femtech
-Women wellness
-Female Helathcare
-Fitness & Wellness Platforms
-Mental Health Apps
-PropTech Solutions
-FinTech Applications
-Workflow & Enterprise Systems (CRM, ERP, POS, Supply Chain)
-Multi-Vendor E-commerce & On-Demand Platforms
From custom workflow automation tools to large-scale consumer apps, I focus on performance, security, and seamless UX.
Tools & Workflow
• Agile (SCRUM, Kanban, Hybrid)
• JIRA, Trello
• GitHub, Bitbucket
• CI/CD & Version Control Best Practices
My Agile background allows me to manage development cycles efficiently, reduce technical debt, and maintain clarity between business goals and technical execution.
What You Can Expect Working With Me
-Clean, scalable, maintainable code
-Clear milestones & proactive communication
-Performance-optimized architecture
-Strict data security standards
-Long-term technical partnership mindset
If you’re looking for a reliable senior mobile developer who understands both technology and business impact, let’s build something powerful together.
less
Mobile App Development
Mobile App Bug Fix
Smartphone
Android App Development
Hybrid App Development
iOS Development
Mobile App
AI Mobile App Development
Mobile App Redesign
Mobile App Design
React Native
Flutter
iPhone & iPad Apps
App Development
AI App Development
App Design
Payment Gateway Integration
Kotlin
Swift
Health & Wellness
Gaurav S.
Noida, India
$15/hr
5.0
9 jobs
Hello
With over 14+ years of extensive experience in iOS, Android, and web development, I bring a strong background in a range of technologies, including Swift, Kotlin, React.js, React Native, Node.js, and Python. I have a solid foundation in backend frameworks and big data solutions like Apache Spark and am well-versed in DevOps practices to ensure seamless deployment and scaling. My expertise also extends to AI and machine learning integrations, where I’ve used advanced data-driven techniques to enhance application intelligence and user experience. Proficient in Figma for UI/UX design and committed to delivering high-quality, impactful solutions, I thrive on bringing innovative ideas to life across platforms, always prioritizing user needs, scalability, and efficiency in every project.
Just have a look at my skills through which I have delivered some impeccable user-friendly mobile apps
Frameworks -:
Native iOS (SWIFT/Objective C)
Native Android (Kotlin/Java)
React Native
App Development IDEs -:
iOS programming : XCode, Objective-C/Swift, Cocoa-touch.
Android: Eclipse/Android Studio, Java Fragments/Activities, SDK.
Design -:
Material Design , Complex & Pixel perfect UI/UX implementation
Extensive UI/UX Skills
Coding Strategy & Version Controlling -:
Well optimized, clean, robust code.
Github & Bitbucket On-Demand
Multi-Language Support -:
Localization And Internationalization support
API /Web Service Integration -:
Node.JS with Mongo/SQL
JSON And XML Based API
REST & SOAP Based API
Parse, Parse REST, Amazon, Firebase
VOIP, Cloud Communication: Twilio, Heroku, Tokbox
Cloud services: iCloud, Rackspace, Zoho CRM, Salesforce, Azure, AWS (S3, EC2, RDS, SES, and other AWS services), Dropbox
Online Payment Gateway: Stripe, Braintree, Payleap.
Business Apps -:
Engineering & Automation tools.
Telecom application.
Restaurant Management.
Appointment Booking apps for Small businesses (e.g. Clinic, Beauty salons, Car Washing
Companies, Spa, etc.).
GPS & Location-based Apps.
Social Apps -:
Integrated with popular social networks such as Facebook, Twitter, Snapchat, Instagram API, Pinterest API, etc.
Cloud-based users database.
Private social networks.
Push notifications, Event alerts, etc.
Entertainment & Utility Apps -:
Wide range of Photo & video Editing apps with cool effects.
Music & Multimedia sharing apps.
Emoji Apps, Scientific Calculators & Converters.
Map & Location-based applications -:
Geo-fencing apps.
Geo Tagging & GPS-based apps.
Apple & Google Map-based apps showing Annotations & Events.
Sports & Fitness apps -:
Fitness, education applications, etc.
Some Advanced features, I have worked on -:
Push notification
iBeacons
In-App Purchase & Subscriptions
Spotify
Podcast
RSS Feeds
Analytics (Google & Flurry Analytics)
Bluetooth
Sound Cloud
QR & Finger Print Based App Development -:
QR, Barcode,PDF 417,Aztec [ZXing,ManateeWorks]
Thumb Enrollment, Thumb Verification
Five Finger Enrollment, Five Finger Verification
Chat Support -:
XMPP, Jabber, OpenFire, Ejabberd
Quickblox
SendBird
Firebase Group Chat
Analytics & Bug-Tracking Solution -:
Google Analytics
Crashlytics
MixPanel
In-App Payment Solutions-:
Google In-App Purchase
Third-party Payment Gateway Integration
Third-party back-end support
Firebase
Push Notification
Firebase Push Notification
Smartphone
Android App Development
iOS
Web Application
Android
Node.js
React
Amit Kumar T.
Noida, India
$15/hr
4.9
11 jobs
Transform your product vision into high-converting, enterprise-grade mobile applications. As a Mobile Solutions Architect with extensive experience across native iOS (Swift) and cross-platform (Flutter) ecosystems, I help startups, SMBs, and global enterprises build scalable, high-performance apps that drive user engagement and business growth.
Core Offerings & Technical Capabilities:
✔ End-to-End Mobile Development: Native iOS (iPhone, iPad) & Cross-Platform Flutter solutions designed for speed and reliability.
✔ Domain Expertise: SaaS platforms, Healthcare/MedTech, eCommerce, On-Demand Booking Systems, and Enterprise Mobility/CRMs.
✔ Architecture & Integrations: Complex REST API integrations, Firebase backend infrastructure, and scalable cloud architectures.
✔ Full Lifecycle Delivery: MVP creation for fast market validation, complete app modernization, UI/UX optimization, and ongoing maintenance.
𝗥𝗲𝗮𝗱𝘆 𝘁𝗼 𝗕𝘂𝗶𝗹𝗱 𝗬𝗼𝘂𝗿 𝗡𝗲𝘅𝘁 𝗕𝗶𝗴 𝗧𝗵𝗶𝗻𝗴?
📍 iOS / Android / Flutter apps — from scratch or MVP to polished product
📍 Full lifecycle: Design → Development → Testing → Publishing
📍 Individuals, Startups & Enterprises needing bulletproof solutions
📍 Idea validation turned into revenue-generating reality
📍 Feature upgrades & performance boosts for your existing app
𝗣𝗿𝗼𝘃𝗲𝗻 𝗧𝗿𝗮𝗰𝗸 𝗥𝗲𝗰𝗼𝗿𝗱
⟷⟷⟷⟷⟷⟷⟷⟷
✔ 50+ live apps delivered on the App Store & Play Store with 5★ client ratings
✔ Scalable Flutter apps built for startups, SMEs & enterprise organizations
✔ Mobile, web & desktop apps with clean, future-proof architecture
✔ 5+ apps successfully published on Google Play Store & Apple App Store
✔ 100% Job Success Score client satisfaction is the only metric that matters
✔ Associated with Flexsin Inc., a Top-Rated agency trusted by Fortune 500 brands
✔ Clients include Johnson & Johnson, Coca-Cola, Disney & Emirates NBD
✔ Clean, maintainable, and scalable code delivered on every single project
✔ Expert in Agile development sprint planning, roadmaps & team leadership
✔ Fluent English communication throughout the entire project lifecycle
🛠️ 𝐌𝐲 𝐒𝐤𝐢𝐥𝐥 𝐒𝐞𝐭
⟷⟷⟷⟷⟷⟷
✔ Mobile App Development, Swift, Objective-C, Kotlin, Java, JetPack Compose
✔ Cross-Platform Development, Flutter (Dart), React Native for iOS & Android
✔ Native iOS, SwiftUI, Objective-C, iOS SDK, Xcode, fast, reliable apps for iPhone & iPad
✔ Native Android: Java, Kotlin, Android SDK secure, scalable apps for all Android devices
✔ Database: SQLite, MySQL, MongoDB, PostgreSQL, AWS DynamoDB, Parse
✔ Architecture Patterns: MVC, MVP, MVVM, Clean Architecture
✔ API Integration: REST, GraphQL, AWS API Gateway, AWS Lambda, JSON, XML, Python
✔ Real-Time & Chat: XMPP, Socketio, Firebase, Twilio
✔ Payment Gateways: Stripe, PayPal, Braintree, HyperPay
✔ In-App Features: In-App Purchases, Push Notifications, Ads, GCM
What I Can Do
⟷⟷⟷⟷⟷
✔ Flutter App Development
✔ iOS Application Development
✔ Cross-Platform Mobile Apps
✔ SaaS Mobile Applications
✔ Healthcare & Booking Apps
✔ CRM & Business Applications
✔ API Integration & Backend Connectivity
✔ Firebase Authentication & Notifications
✔ App UI/UX Improvements
✔ App Performance Optimization
✔ App Store Publishing
✔ Bug Fixing & Maintenance
✨ 𝗚𝗹𝗶𝗺𝗽𝘀𝗲𝘀 𝗼𝗳 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝗶𝗲𝘀 𝗜'𝘃𝗲 𝗪𝗼𝗿𝗸𝗲𝗱 𝗜𝗻
⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷⟷
✔ Fintech & Banking Apps
✔ Healthcare & HIPAA-Compliant Health Solutions
✔ Health, Fitness & Meditation / Wellness Apps (with AI Integration)
✔ Food & Grocery Delivery Apps with Real-Time Order Tracking
✔ Travel & Ticket Booking Apps
✔ Transport & Logistics Apps
✔ Dating & Social Networking Apps
✔ Real-Time Chat & Messaging Apps
✔ Real-Time Audio & Video Calling / Streaming Apps
✔ Loyalty & Rewards Apps with Coupons & Gift Cards
✔ Productivity & Task Management Apps
✔ Music & Audio Streaming Apps
✔ E-Learning / EdTech Apps
✔ Real Estate Apps with Property Listings
✔ Multi-Vendor Marketplace & E-Commerce Apps
✔ Live Streaming & Video Sharing Apps
✔ On-Demand Service Apps — Taxi, Food, Delivery & Home Services
✔ SaaS Mobile Application Platforms
✔ AR / VR & IoT Mobile App Development
✔ Taxi & Ride Booking Apps
✔ On-Demand Home & Technician Service Apps
✔ Event Booking & Management Apps
✔ Bakery & Restaurant Apps
✔ Bluetooth Smart Device Control Apps
✔ NFC (Near Field Communication) Innovation Apps
𝗪𝗵𝘆 𝗪𝗼𝗿𝗸 𝗪𝗶𝘁𝗵 𝗠𝗲?
⟷⟷⟷⟷⟷⟷⟷
✅ Scalable and maintainable mobile app architecture
✅ Clean and responsive UI/UX design
✅ Fast communication and project updates
✅ Agile development methodology
✅ On-time delivery and long-term support
✅ Experience with startup and enterprise applications
✅ Flexible engagement models
✅ Trusted by global enterprises: Disney, Coca-Cola, Johnson & Johnson
💡 Let's turn your idea into a high-performing product.
👉 Click 'Invite to Job' — and let's build your success story today!
Mobile App Development
Mobile App Improvement
Mobile App Bug Fix
Smartphone
Android App Development
Hybrid App Development
iOS Development
Native App Development
Flutter
FlutterFlow
User Authentication
iOS
Map Integration
AI Mobile App Development
Flutter Stack
AI App Development
Mobile App Design
Mobile App Development Consultation
Mobile App Redesign
Mobile Wallet
Sumant A.
Noida, India
$25/hr
5.0
5 jobs
🚀 10+ years building apps that ship — iOS, Android, and full-stack web. If you have an idea or a broken product, I help you move fast without cutting corners.
I specialise in React Native, Swift/SwiftUI, Kotlin, and modern web stacks (React, Node.js, Laravel). From MVP to production-scale, I've done it — e-commerce platforms, AI-powered tools, real-time dashboards, and everything in between.
What working with me looks like:
✅ Free discovery call to scope your project accurately
✅ Daily updates — no ghosting, no guessing
✅ Clean, documented code you actually own
✅ Delivery within agreed timelines, every time
Tech I work with:
📱 Mobile: React Native, Expo, Swift / SwiftUI, Kotlin / Java
🖥️ Frontend: React.js, Angular, HTML5 / CSS3
⚙️ Backend: Node.js, Laravel / PHP, WordPress
☁️ Cloud & AI: Firebase, AWS, ChatGPT API, AI Chatbots
🗄️ Database: MySQL, MongoDB, Azure SQL
Available Mon–Fri, 8 hrs/day · 40 hrs/week · Immediate start · Free consultation call
Mobile App
Android
iOS
React Native
Flutter
React
Node.js
PHP
WordPress
AngularJS
UI/UX Prototyping
Figma
Girish N.
Noida, India
$15/hr
5.0
17 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.
Mobile App Development
Android App Development
iOS Development
Flutter
FlutterFlow
Bluetooth LE
SwiftUI
macOS
Swift
AI Development
AI Chatbot
React Native
PHP
Node.js
Machine Learning
Firebase
Kotlin
BLEN
Apple Watch
AWS IoT Core
Rahul B.
Noida, India
$22/hr
5.0
39 jobs
My recent mobile work includes BLE-connected dive equipment, offline insurance claims, camera controls, healthcare kiosks, and difficult App Store or Google Play releases. I develop in Flutter, React Native, Swift, SwiftUI, and Kotlin, and I am comfortable taking over an existing app as well as starting a new one.
The Upwork history includes React Native updates, iOS call-reliability work, Flutter apps with maps and learning features, App Store submissions, PWA wrappers, and AI-assisted mobile products. I can usually tell fairly quickly whether a problem is limited to the next release or points to something deeper in the architecture.
Kraken NextGen is an iOS and Android app for underwater photographers and divers. I worked on BLE communication with dive hardware, camera controls, offline image editing, AI-assisted image enhancement, decompression calculations, and in-app purchases. Intermittent connectivity and specialized hardware shaped the design of the main user flows.
Echo replaced paper visitor registers in rehabilitation and healthcare facilities. The product includes an Android kiosk app, a React Native administration app, and a web console. It is used across 31 facilities and supports remote device deployment, badge printing, visitor records, and push, email, and SMS alerts.
iContentsPro is a cross-platform insurance-claims product used by homeowners, field staff, examiners, and administrators. It combines an offline-capable React Native app with web access, reporting, payments, and AI image analysis. The stack includes Expo, Realm, AWS, OpenAI Vision, Stripe, and Apple In-App Purchases. The initial release continued into a multi-year engagement.
Areas I cover:
• Flutter and React Native product development
• Native iOS and Android work
• BLE, camera control, maps, payments, and subscriptions
• Offline storage, synchronization, push notifications, and WebSockets
• TestFlight, Google Play, store compliance, and release support
• Performance work, crash investigation, and codebase takeovers
For an existing app, I ask for the current build, repository access, crash reports, release accounts, and the next feature list. I reproduce issues before changing code and keep urgent release work separate from larger architectural changes. For a new app, I work through offline behavior, permissions, and API contracts early because those decisions affect both platforms.
Mobile App Development
Smartphone
Android App Development
iOS Development
Mobile App
Flutter
React Native
iOS
Android
Swift
Kotlin
Dart
Firebase
User Authentication
AI Mobile App Development
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