I help startups and businesses build high-quality mobile applications for iOS and Android. With 10+ years of experience, I specialize in native and cross-platform development using Swift, Kotlin, Flutter, and React Native. I focus on clean code, smooth user experience, scalable architecture, and reliable delivery. I build mobile apps with features like push notifications, maps, chat, payments, authentication, and backend integration. I also help with App Store and Google Play deployment.

🚀 I build production-grade AI apps that actually ship on the App Store — not prototypes that die in TestFlight. 100% Job Success across 43 projects, 2,233 hours, and $60K+ delivered on Upwork. Most recent: a full end-to-end AI skincare platform live on the Japan App Store — built solo from Figma to launch. 📱 React Native app (iOS & Android): AI face scan, real-time voice chat via OpenAI Realtime API + WebRTC, skincare routine builder, Stripe + RevenueCat subscriptions, Google Maps clinic finder. ⚙️ FastAPI backend: 20+ API route groups, JWT auth, RAG-powered recommendation engine (LangChain + Pinecone), Stripe payment processing. 🧠 AI image analysis microservices: dual-mode skin analysis pipeline combining MediaPipe / OpenCV computer vision AND GPT-4 Vision, with async Celery job queue and S3 storage. What I do, end-to-end: ✅ AI / LLM: OpenAI / Anthropic / LangChain / RAG (Pinecone) / Realtime Voice AI / Computer Vision ✅ Mobile: React Native (Expo) / iOS / Android / Stripe / RevenueCat / In-App Purchase / Push ✅ Backend for AI: FastAPI / NestJS / PostgreSQL / Vector DBs / Celery ✅ Infrastructure: AWS / Docker / Redis / CI/CD I work best with founders and product teams who need an engineer who can take an AI idea from Figma to App Store solo — including the LLM/RAG/agent layer, payments, and infra — without hand-holding. If your project has an AI component (chatbot, RAG, face analysis, voice, agent workflow) and a real ship date, message me with the rough scope. I usually reply within a few hours and can offer a 1–3 day free pilot so we can validate fit before committing to the full build.

I build scalable Android, iOS apps and fast MVPs that get real results (1M+ downloads). Senior Flutter Developer with 10+ years total experience & $600k+ earned on Upwork. ✅ Top Rated Plus on Upwork ✅ $600K+ earned | 159 jobs | 2500+ hours ✅ 100% Job Success Score ✅ Free 30-minute strategy consultation As a Senior Flutter Developer and Flutter Engineer, I create scalable, high-performance Flutter apps through expert Flutter development that delivers real user growth and business value. I also leverage FlutterFlow to accelerate development when speed is critical, and offer React Native as a strong secondary option for teams already invested in that ecosystem. I help startups and established businesses build production-ready mobile apps, fast MVPs, and feature-rich solutions with clean code, strong architecture, and excellent maintainability. 🚀 𝗣𝗿𝗼𝘃𝗲𝗻 𝗔𝗽𝗽 𝗦𝘂𝗰𝗰𝗲𝘀𝘀 - AWCC Asan – Cross-platform app with 1M+ downloads - Glossary Planner – Shopping & productivity app with 100K+ downloads - Temple Bliss – Lifestyle app with 20K+ downloads - Hitchhyke – Recently launched ride-sharing & ride hailing mobility platform (From MVP to scalable product) I focus on apps that users love and adopt long-term. 💡 𝗖𝗼𝗿𝗲 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲 - Cross-platform Flutter app development and Flutter application developer services (React Native when required) - Rapid MVPs and full-cycle development - AI integrations including ChatGPT integration and AI-powered chatbots - In-App Purchase (IAP) implementation and Reward & discounts systems - Firebase, Supabase for scalable backend - UX/UI Design focused on user retention - Thorough Testing and QA - App Store & Google Play deployment - Payments, Maps, Real-time features - REST/GraphQL APIs, Node.js backend support 🏭 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝗶𝗲𝘀 𝗜 𝗪𝗼𝗿𝗸 𝗪𝗶𝘁𝗵 - Ride-sharing, ride hailing & carpooling platforms (Uber-like & on-demand) - Food delivery and ordering apps - EdTech / Educational online tuition & tutorial apps / eLearning - Coaching platform development - Sports & fitness apps - E-commerce & marketplaces - Health & Fitness, HealthTech & Medical apps - Veterinary App development - Social Networking apps - Travel and tour apps - Music, podcast & video streaming apps - Hotel, restaurant, flight ticket & event booking apps - Weather applications - Loan app & Fintech solutions - HR & Media platforms 🏆 𝗥𝗲𝗰𝗼𝗴𝗻𝗶𝘁𝗶𝗼𝗻 & 𝗟𝗲𝗮𝗱𝗲𝗿𝘀𝗵𝗶𝗽 - Prize Winner – FYP Contest - Top Developer on Clutch (2022) - 10+ years experience delivering mobile products globally ⭐ 𝗪𝗵𝗮𝘁 𝗖𝗹𝗶𝗲𝗻𝘁𝘀 𝗦𝗮𝘆 ⭐⭐⭐⭐⭐ "After wasting time and money with other developers, we finally found a professional team. We're already building our third app together." 🤝 𝗪𝗵𝘆 𝗪𝗼𝗿𝗸 𝗪𝗶𝘁𝗵 𝗠𝗲 - Agile methodology with transparent sprints - NDA signed when required - Business-oriented approach with clear communication - Long-term support post-launch Message me today to get a FREE 30-minute strategy session. Let's discuss your vision and map out the fastest path to launch a successful, scalable Flutter app that performs on App Store and Google Play. Highlighted Skills: Mobile App Development | Mobile App Developer | Mobile Application Developer | iOS App Developer | iOS Developer | Flutter Developer | Flutter App Developer | Flutter Mobile App Developer | Flutter Application Developer | Flutter Engineer | Flutter App Development | Flutter Development | Flutter Mobile App Firebase | Flutter Mobile App Dart | Flutter Laravel | Mobile Engineer | Full Stack Mobile App Developer | AI Mobile App Developer | AI Mobile App | AI ChatGPT Integration | In-App Purchase | React Native | React Native Mobile App Development | Ride-Sharing App | Ride Hailing App | Carpooling App | Food Delivery App | Reward and Discounts | E-commerce App | Sports App | Coaching Platform | Veterinary App | Health & Fitness App | Medical App | HealthTech | Social Networking App | Weather Application | Loan App | Travel and Tour App | Music Podcast & Video Streaming App | Hotel Restaurant Flight Ticket Event Booking App | EdTech | Educational Tutorial App | Mobile App Builder | Mobile App Development Consultation | Android Mobile App Developer | Hybrid Mobile App

Are you ready to take your project to the next level? Look no further because I'm, a Full Stack Developer with a stellar 10+ year track record of delivering exceptional results in the world of web and mobile app development. I don't just build software; I craft digital experiences that leave a lasting impact. My journey in the tech world began over a decade ago, and I've been on a relentless quest for excellence ever since. I've had the privilege to collaborate with a wide array of clients – from disruptive startups to global enterprises – and have consistently exceeded their expectations. When you work with me, you're not just hiring a developer; you're partnering with a tech visionary who's driven by a passion for innovation. My expertise spans the entire software development spectrum, from concept to deployment and beyond. Here's a glimpse of the technologies and tools I command with mastery: - Front-end: HTML, CSS, JavaScript, React, Angular, Vue.js - Back-end: Node.js, Django, PHP, Express.js - Databases: MySQL, PostgreSQL, MongoDB, Redis - Mobile: React Native, Flutter - DevOps: Docker, AWS, Azure, Heroku - Testing: Mocha, Jasmine, Jest - Project Management: Agile, Scrum What sets me apart? I do more than write code; I design solutions. I'm passionate about crafting code that's clean, efficient, and can grow as your needs do. My expertise also includes speeding up existing applications to perform at their best. I don't just meet expectations; I exceed them. 📚 I'm always committed to staying up-to-date. I'm not just experienced; I'm a lifelong learner. In an ever-evolving tech landscape, I thrive by embracing the latest trends and best practices. I adapt. I innovate. I lead. If you're looking for a Full Stack Developer who thrives on challenges and consistently delivers remarkable results, your search ends here. Let's collaborate to transform your vision into a digital masterpiece. Your success is my success. Drop me a message, and let's talk. I'm not just here to build software; I'm here to build a legacy. Don't settle for mediocrity when you can have excellence. Elevate your project, and let's make a mark in the digital world together.

𝗔𝘄𝗮𝗶𝘀 𝗵𝗲𝗿𝗲. I’m a full-stack developer focused on building high-quality 𝘄𝗲𝗯, 𝗺𝗼𝗯𝗶𝗹𝗲, and 𝗔𝗜-𝗽𝗼𝘄𝗲𝗿𝗲𝗱 𝗮𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀 that are both scalable and easy to use. 𝐖𝐡𝐲 𝐰𝐨𝐫𝐤 𝐰𝐢𝐭𝐡 𝐦𝐞: —----------------------------- 🌟 Practical, user-first development approach 🌟 Consistent progress updates (no guesswork) 🌟 Honest timelines — no overpromising 🌟 Clean, maintainable, and scalable code 🌟 Full ownership from idea to deployment 🌟 Support and guidance even after delivery --- 𝐈𝐧𝐝𝐮𝐬𝐭𝐫𝐢𝐞𝐬 𝐈 𝐖𝐨𝐫𝐤 𝐖𝐢𝐭𝐡 —----------------------------- o Edtech o Fintech o Healthcare o Fitness / Wellness o E-commerce o AI-based applications o General business solutions --- 𝐖𝐡𝐚𝐭 𝐈 𝐂𝐚𝐧 𝐁𝐮𝐢𝐥𝐝 —----------------------------- o Web Applications (Frontend + Backend) o Mobile Applications (Cross-platform) o AI-powered features & integrations o Custom APIs & backend systems o Cloud-based application deployment o Automation tools & data-driven solutions 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤 𝐈 𝐔𝐬𝐞 —----------------------------- 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 o React JS o Next JS o Angular o HTML5, CSS3, JavaScript 𝐁𝐚𝐜𝐤𝐞𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 o Node JS o Express JS 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞𝐬 & 𝐂𝐥𝐨𝐮𝐝 o MongoDB o Firebase o AWS o Azure 𝐌𝐨𝐛𝐢𝐥𝐞 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 o React Native --- 🎯 Core Expertise ◉ Building responsive and intuitive user interfaces ◉ Developing scalable backend systems and APIs ◉ Creating full-stack applications from scratch ◉ Integrating AI features into real-world products ◉ Managing complete development lifecycle ◉ Writing clean, efficient, and maintainable code --- 𝐇𝐨𝐰 𝐈 𝐖𝐨𝐫𝐤 I focus on keeping things simple and effective building applications that not only work smoothly but are also easy to use and scale. From early idea discussions to final deployment, I stay involved to ensure the product delivers real value. --- If you’re looking for someone who can turn your idea into a reliable, well-structured application I’d be happy to help. 𝐅𝐞𝐞𝐥 𝐟𝐫𝐞𝐞 𝐭𝐨 𝐫𝐞𝐚𝐜𝐡 𝐨𝐮𝐭 𝐟𝐨𝐫 𝐚 𝐅𝐑𝐄𝐄 𝐜𝐨𝐧𝐬𝐮𝐥𝐭𝐚𝐭𝐢𝐨𝐧 𝐚𝐧𝐝 𝐥𝐞𝐭’𝐬 𝐝𝐢𝐬𝐜𝐮𝐬𝐬 𝐲𝐨𝐮𝐫 𝐩𝐫𝐨𝐣𝐞𝐜𝐭. Regards, 𝐀𝐰𝐚𝐢𝐬 𝐊𝐡𝐚𝐥𝐢𝐝.

Full-Stack & Mobile Architect with 12+ years of experience delivering enterprise-grade digital solutions for 65+ global clients. I specialize in building scalable web and mobile applications, AI-integrated systems, and cloud-based platforms that transform complex business requirements into secure, high-performance, production-ready solutions. With a 100% Job Success Score and a flawless delivery record, my work has contributed to 160K+ app downloads across industries including Healthcare, FinTech, HRMS, SaaS, eCommerce, and Enterprise systems. I bring strong expertise across MEAN/MERN, React, Angular, Node.js, Ionic/React Native, AI/ML integrations, cloud infrastructure (AWS/Azure/Firebase), and enterprise integrations such as ERP, CRM, and payment systems. I focus on clean architecture, scalability, security, and long-term maintainability — delivering enterprise quality with startup agility and full ownership from concept to deployment. Core Technical Expertise * Cross-Platform Mobile Development (Ionic, React Native, Cordova, Capacitor) * Micro Frontend * Modern Web Applications (React, Angular, Node.js, PHP) * Micro Services * AI & Intelligent System Integration (OpenAI, automation, recommendation engines) * Cloud Infrastructure (AWS, Azure, Firebase) * Database Architecture (MySQL, PostgreSQL, MongoDB) * Enterprise Integrations (ERP, CRM, Payment Gateways) * App Store & Play Store Deployment * Agile Delivery & Structured Project Execution I would be glad to support you with your project and understand your requirements in detail. If you are available, we can schedule a short call or connect over chat to align on the scope and expectations.

Are you building a mobile app or web platform and need someone who can own the full stack — not just the front end? I'm a full-stack developer with 10+ completed projects and $60K+ billed on Upwork. I specialize in React Native mobile apps and React/Next.js web platforms, backed by Node.js and Python APIs. What I can build for you: 📱 Mobile — Cross-platform iOS & Android apps with React Native, Firebase, Redux, and push notifications. 🌐 Web — Fast, scalable frontends with React.js and Next.js, paired with clean UI using TailwindCSS. ⚙️ Backend — REST APIs and server-side logic with Node.js, Express, Python, and Django. 🗄️ Data — MongoDB and Firebase for real-time apps, SQLite for offline-first and data-heavy mobile applications. I work best with founders and product teams who have a clear vision and need a reliable developer who communicates well and ships on time. Send me a message with a quick overview of your project — I typically respond within a few hours.

🏆 React Native & Mobile App Development Expert | 200+ Projects Delivered | 100% Client Satisfaction I build mobile applications that launch faster, scale reliably, and are easy to maintain long after release. From MVPs to enterprise platforms, I help startups and businesses turn ideas into production-ready iOS and Android applications. You're in the right place if: • You need an experienced React Native developer who can take ownership. • Your app has bugs, crashes, or performance issues that need fixing. • You need to launch an MVP quickly without sacrificing quality. • You need pixel-perfect implementation from Figma. • You want AI features integrated into your application. • You need a developer who can handle both mobile and backend development. Over the last 6+ years, I have helped startups, agencies, and businesses build high-performance mobile applications used by real customers. I specialize in developing scalable React Native applications, implementing complex features, integrating third-party services, and optimizing existing codebases. 📱 Mobile App Development • React Native (CLI & Expo) • iOS & Android App Development • Cross-Platform Mobile Applications • Figma to pixel-perfect mobile UI implementation • Redux Toolkit, Zustand, Context API • Performance optimization & debugging • GraphQL & REST API integration • App Store & Google Play Deployment 🤖 AI-Powered Applications • OpenAI & ChatGPT Integration • AI Assistants & Chatbots • AI Content Generation • AI-Powered Mobile Features • Custom AI Workflows 🌐 Backend & Full-Stack Development • Node js, Express js, NestJS • Firebase (Auth, Firestore, Cloud Functions, FCM) • REST APIs & GraphQL • JWT & OAuth Authentication • Real-Time Applications (WebSockets / Socket IO) • Stripe & RevenueCat Subscription Systems • Push Notifications, Maps & Geolocation I also develop scalable backend architectures that power mobile and web applications, focusing on performance, security, and clean API design. I build modular backend systems that are easy to maintain, extend, and deploy in production environments. 🗄️ Databases • PostgreSQL • MongoDB • Supabase • Redis 🚀 What I Deliver • Scalable mobile app architecture • Production-ready React Native apps • Clean, maintainable codebases • API integration & backend connectivity • Bug fixing & performance improvements • App store deployment support Industries Healthcare • Marketplace • E-commerce • Social Networking • Tourism • Job Hiring • Food Delivery • SaaS • AI Applications • Enterprise Solutions • Dating Apps • Subscription-Based Apps Whether you're building a new MVP, scaling an existing application, integrating AI features, implementing subscriptions with RevenueCat, or fixing critical issues in a live product, I can help deliver a reliable and production-ready solution. Let's discuss your project.

‼️FREE consultation will be provided! FREE consultation service: I am more than happy to share my years of experience in helping clients build web/mobile applications from the ground up, including but not limited to, setting up MVP, choosing tech stack, scoping out practical plan/timeline, estimating budget, and more. Please do not hesitate to contact me for this free service and we can together turn your idea into reality. 💪💪💪 With many years of experience in working with clients and leading teams from various backgrounds, I put stress on responsibility, communication, and efficiency. 💻💻💻 Previously, I worked as a full-stack software engineer team lead at Camping World, which is a publicly traded company, and as a lead technical teaching assistant at Hack Reactor. Front End: JavaScript (ES5 and ES6) | TypeScript | HTML5 | CSS3 | Tailwind CSS | React | React-Native | Redux | React Hooks | Vue.js | jQuery | D3 Back End: Node.js | Django | MongoDB | Mongoose | MySQL | PostgreSQL | Sequelize | GraphQL API Integrations: ChatGPT | Stripe | Azure | Google | Zoom | and more... Testing/Deployment: Amazon Web Services (AWS) | Firebase | Docker | Mocha | Chai | Jest | Artillery | Loader.io Developer Tools: Git | npm | Webpack | Babel | Agile Methodology | TDD | Nginx Design: Adobe XD | Figma

𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 | 𝗙𝗹𝘂𝘁𝘁𝗲𝗿 𝗔𝗽𝗽 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 | 𝗥𝗲𝗮𝗰𝘁 𝗡𝗮𝘁𝗶𝘃𝗲 𝗔𝗽𝗽 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 | 𝗶𝗢𝗦 𝗔𝗽𝗽 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 | 𝗔𝗻𝗱𝗿𝗼𝗶𝗱 𝗔𝗽𝗽 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 | 𝗞𝗼𝘁𝗹𝗶𝗻 | 𝗦𝘄𝗶𝗳𝘁 | 𝗗𝗮𝗿𝘁 | 𝗠𝗼𝗯𝗶𝗹𝗲 𝗔𝗽𝗽 𝗗𝗲𝘀𝗶𝗴𝗻 | 3+ 𝐘𝐞𝐚𝐫𝐬 𝐨𝐟 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 𝐢𝐧 𝐁𝐮𝐢𝐥𝐝𝐢𝐧𝐠 𝐒𝐜𝐚𝐥𝐚𝐛𝐥𝐞 𝐒𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬 No matter if you are in the early stages, managing an established business, or seeking a Minimum Viable Product (MVP), I am dedicated to providing outstanding services that fit within your budget, ensuring your utmost satisfaction 💯. ➸ 𝙈𝙤𝙗𝙞𝙡𝙚 𝘼𝙥𝙥𝙡𝙞𝙘𝙖𝙩𝙞𝙤𝙣𝙨: Native, Cross-Platform, and Hybrid solutions tailored for both Android and iOS. Over the last 3+ years, I have refined my expertise in creating a wide range of iPhone and Android applications, including: ✔ Food Delivery Apps ✔ Nutrition Planning Apps ✔ Restaurant Search Apps ✔ Hotel and Travel Booking Apps ✔ Health and Fitness Apps ✔ GPS/ Geo Location Apps ✔ Bluetooth / BLE Integration Apps ✔ Real Estate Apps ✔ Artificial Intelligence based Apps ✔ Salon Booking Apps ✔ Taxi Apps ✔ E-commerce Apps ✔ Gym Booking Apps ✔ Video Streaming, Voice Calling, Chat and Messaging Apps ✔ Online Courses, Online Education Learning, Tutor, ✔ Dating and TikTok Style Apps 𝐓𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: I bring versatility and adaptability, having mastered a broad range of tools and frameworks across web, mobile, and cloud technologies: ➸ Mobile App Development: Java, Kotlin, Objective-C, Swift, SwiftUI ➸ Cross-platform Hybrid App Development: Flutter (Dart), React Native ➸ Web Frontend: React.Js, Redux, Vue.js, Angular, HTML5, CSS3, BootStrap, JavaScript, jQuery ➸ Web Backend: PHP, Node.js, Laravel, Express.js, Nest,js ➸ Databases: MongoDB, MySQL, PostgreSQL, SQLite, AWS DynmoDB ➸ Cloud Solutions: AWS (EC2, Lambda, S3), Firebase, Azure ➸ 3rd Party APIs Integrations: AWS API Gateway, AWS Lambda, Rest API, JSON, XML ➸ Social Integration: Facebook, Twitter, Youtube, Instagram, Snapchat, Tinder ➸ Chat: XMPP, Socket, Firebase, Twilio ➸ Payment Gateway: Paypal, Braintree, Stripe Payment Gateway ➸ In-app Features: In-App Purchase: Advertisement, Push Notifications, GCM, Google Analytics ➸ Version Control Tools - Github, Bitbucket, Gitlab ➸ Google Map, Apple Map kit, Geolocation, GPS, Location Tracking 𝐈𝐧𝐝𝐮𝐬𝐭𝐫𝐲-𝐒𝐩𝐞𝐜𝐢𝐟𝐢𝐜 𝐒𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬 I have successfully delivered projects across diverse industries, with expertise spanning: ➸ Social Networking and Community Platforms ➸ E-Commerce: Single Vendor, Print on Demand (POD), and Multi-Vendor Applications ➸ Healthcare Solutions: HIPAA-Compliant Platforms, Telemedicine, and Fitness Applications ➸ Logistics Management: Freight, Cargo, Fleet, Warehouse, and Supply Chain Solutions ➸ FinTech and POS: Digital Payments, Invoicing, and Financial Applications ➸ Learning & Education Management (LMS): Subscription and Membership-Based Platforms ➸ Real Estate: Property Listings and Management Systems ➸ On-Demand Service Platforms ➸ ERP & Business Automation: Workflow Automation, Inventory, WMS, CRM, Tracking, and Reporting 𝐋𝐞𝐭’𝐬 𝐁𝐫𝐢𝐧𝐠 𝐘𝐨𝐮𝐫 𝐈𝐝𝐞𝐚𝐬 𝐭𝐨 𝐋𝐢𝐟𝐞 🚀 Whether you're building a new product, optimizing an existing platform, or exploring new technologies, I’m ready to help align our vision and budget for a long-term partnership. Let’s make your digital transformation a reality. Click "𝗜𝗡𝗩𝗜𝗧𝗘" button to initiate a discussion about your project and how I can assist you in reaching your business goals. 𝙍𝙚𝙜𝙖𝙧𝙙𝙨, Pallvi_Mobile App Developer Related Keywords:- Mobile App Developer, Mobile app development, Android app Development, iOS app development, Native App Development, Android Developer, iOS Developer, Kotlin, Swift, Flutter Developer, React Native Developer, Flutterflow-Flutter Developer, Firebase, BLE, ChatGPT, AI, Chatbot, Cross-Platform Development, Android Apps, iOS Apps, Mobile UI/UX Design, API Integration, Firebase, AWS, Custom App Solutions, Payment Gateway Integration, Backend Development, REST APIs, Push Notifications, Google Play Store Deployment, Apple App Store, React Native Developer, Flutter Developer, Mobile app Design