Java Spring Boot full stack developer specializing in fintech platforms and payment systems - Stripe, Plaid, and custom payment gateway integrations for enterprise and growing startups. I build secure, scalable backend systems that handle real money: wire transfers, EFT payments, subscription billing, and bank integrations. My work sits at the intersection of clean Java architecture and financial compliance: Spring Security, ISO 20022, PCI-aware design, and AWS serverless infrastructure. My core focus is payment gateway integrations: Stripe integration, Plaid integration, Interac, and custom EFT/Wire flows built on Spring Boot microservices designed for high-volume transaction processing. I also deliver full fintech SaaS platforms from MVP to production-ready architecture, AWS serverless infrastructure using Lambda, Fargate, SQS/SNS and Aurora PostgreSQL, and React frontends connected to financial backends. How I work: I start with a technical audit or business analysis to map exact requirements before writing a line of code. Every integration is documented, tested with JUnit, and handed over with internal team training so you can maintain and extend it in-house. Recent work: Delivered a full Interac payment integration for a UK-based fintech expanding into Canada, launched in 20 days using Java microservices and ISO 20022 standards with zero post-launch issues. Separately scaled a B2B payment SaaS platform to handle 10x transaction volume using AWS serverless architecture, cutting infrastructure costs by 30%. If you're building a fintech platform, integrating a payment gateway, or need a reliable Java backend partner for the long term, let's talk.

Hi, I’m Nimisha 👋 I am an Android developer with strong skills in building clean, functional, and user-friendly mobile applications. My main focus is on delivering quality apps that meet client needs while keeping performance and design in mind. ✅ What I Do Best: Develop Android apps from scratch Fix crashes, bugs, and performance issues Add new features and updates to existing apps Integrate REST APIs and Firebase (Authentication, Database, Push Notifications) Design Android UI with XML layouts Publish apps to the Google Play Store Work with SQLite and Room Database Maintain and support apps after delivery ✅ Why Choose Me: Clear and professional communication Attention to detail and problem-solving Ability to take an idea from concept to a fully functional app Focus on long-term reliability and client satisfaction Let’s connect to turn your app idea into reality 🚀

I believe in empowering others with steady support so they can grow into their full potential. 🚀 340+ mobile apps, backend systems, APIs, and SaaS platforms delivered 🏆 Top Rated Plus on Upwork | 100% Job Success | 88% Recurring Clients 📱 Apps with 5M+ active users | 💼 Projects backed by Stanford & global startups 🌐 Multi-tenant SaaS systems across fintech, healthcare, e-commerce, and education 🔐 Enterprise-grade security, real-time performance, and cloud-native deployments Looking for a full-stack developer who delivers both seamless mobile and web experiences along with robust backend systems? You’ve found one. I specialize in mobile and web application development along with backend infrastructures that are secure, scalable, and built for real-world growth. From MVPs to enterprise systems, I bring a complete skill set in Flutter, React Native, Kotlin, Swift, Java, Dart, ASP.NET, .NET Core, C#, and cloud DevOps to help you launch and scale with confidence. 🧰 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤 & 𝐓𝐨𝐨𝐥𝐬 Flutter, React Native, Kotlin, Swift, Java, Dart .NET Core, C#, ASP.NET, Node.js REST APIs, GraphQL, gRPC, WebSockets, SignalR AWS, Azure, Docker, Kubernetes, Lambda, App Services SQL Server, PostgreSQL, MongoDB, Firebase Figma, GitHub, GitLab CI/CD, Jenkins OAuth2, JWT, SSO, Biometric Login Stripe, Apple Pay, Twilio, OpenAI, ERP/CRM integrations 📱 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 Cross-platform and native app development with responsive UI/UX, custom animations, real-time features, and secure payment flows 🛠️ 𝐁𝐚𝐜𝐤𝐞𝐧𝐝 & 𝐀𝐏𝐈 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 Clean, versioned APIs and backend services using .NET Core and Node.js, built with cloud scalability, security, and performance in mind ☁️ 𝐂𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬 𝐀𝐫𝐜𝐡𝐢𝐭𝐞𝐜𝐭𝐮𝐫𝐞 Dockerized services, Kubernetes, CI/CD pipelines, and cloud deployments on AWS and Azure 🔐 𝐀𝐮𝐭𝐡𝐞𝐧𝐭𝐢𝐜𝐚𝐭𝐢𝐨𝐧 & 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬 SSO, 2FA, biometric login, and seamless integrations with Stripe, Twilio, OpenAI, CRMs, and more 📊 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞 𝐃𝐞𝐬𝐢𝐠𝐧 & 𝐎𝐩𝐭𝐢𝐦𝐢𝐳𝐚𝐭𝐢𝐨𝐧 Efficient, secure data storage with indexing, replication, backups, and SQL/NoSQL support 📦 𝐋𝐨𝐧𝐠-𝐓𝐞𝐫𝐦 𝐌𝐚𝐢𝐧𝐭𝐞𝐧𝐚𝐧𝐜𝐞 & 𝐒𝐜𝐚𝐥𝐢𝐧𝐠 Post-launch support, monitoring, app store deployment, bug fixing, and feature updates Whether you're building a mobile-first product, a backend-heavy SaaS platform, or a fully integrated cloud system, I bring the skills and experience to deliver real-world results that scale. 📩 Let’s connect and build something exceptional. Drop a message.

🔥 Top Rated — Among Top 10% Mobile App Developers on Upwork ⏱ 8+ years of professional Android development experience ✅ 15+ apps delivered — solo-shipped and client-delivered on Google Play ✅ Expert in Kotlin, Jetpack Compose, Clean Architecture & MVVM ✅ Proven in production: payments, VOIP, real-time, CI/CD, multi-module Hi there! I'm a Senior Native Android Developer with 8+ years of hands-on production experience building high-performance mobile applications for startups, agencies, and international product companies. I specialize in Kotlin and Jetpack Compose, architecting scalable MVVM and Clean Architecture codebases, integrating complex third-party SDKs, and shipping apps end-to-end to the Google Play Store. I work as a hands-on technical partner — from the first architecture decision to CI/CD pipeline setup, Play Store release, and long-term maintenance. I genuinely love building Android apps that solve real problems and survive production. That drive has led me to solo-ship complete consumer apps — handling everything from architecture and UI to AdMob, Firebase, ASO, and automated deployment pipelines — while simultaneously delivering enterprise-grade client projects at an agency level. I hold a Top Rated badge on Upwork with a 100% Job Success Score. Accomplishments: 🏆 Solo-built and shipped a Habit Tracker app entirely from scratch — architecture, Jetpack Compose UI, dual-channel notifications, AdMob UMP consent, Firebase Analytics & Crashlytics, CI/CD pipeline, and full Play Store listing with ASO 🏆 Delivered a full retail pawn and e-commerce Android app at M3N Technologies (multi-module, Jetpack Compose, Clover payments, Google Maps, Paging 3, Firebase) — also maintaining the iOS version in Swift and RxSwift for full feature parity 🏆 Built and shipped a global VOIP calling app live on Play Store — integrating PJSIP, Stripe, and PayPal with full in-app purchase and calling bundle flows 🏆 Delivered a UN NGO tuberculosis patient tracking app deployed nationwide across Pakistan — using MVVM, WorkManager, Room, and FCM 🏆 Built a global remote collaboration platform with fund escrow, AI talent matching, e-contracts, and milestone tracking — using SocketIO, Hilt, Firebase, and Alipay/PayPal SDKs If you have read this far, I appreciate you taking the time to learn about me. It has been a rewarding journey building production Android apps across health, logistics, fintech, retail, VOIP, and social domains — each project making me a sharper engineer and a better technical partner for my clients. Android Development: Kotlin | Jetpack Compose | MVVM | Clean Architecture | MVI | Android SDK | Hilt | Koin | Room | DataStore | Coroutines | Flow | Retrofit | GraphQL | Paging 3 | Firebase | AdMob | Google Play Billing | WorkManager | Material Design 3 | Multi-module Architecture | CI/CD | Google Maps | In-App Purchases | Push Notifications | Payment Gateway Integration | Java | Swift | iOS Maintenance Tech stack: - UI: Jetpack Compose, XML (legacy), Material Design 3 - Architecture: MVVM, MVI, Clean Architecture, UDF, Repository Pattern - Async: Coroutines, Flow, RxJava, LiveData - Dependency Injection: Hilt, Koin - Networking: Retrofit, GraphQL, REST APIs, SocketIO, SignalR, RSocket - Database: Room, SQLite, Realm, DataStore - Firebase: Analytics, Crashlytics, Remote Config, FCM, Performance Monitoring - Payments: Stripe, PayPal, Google Play Billing, Clover, Alipay - Other SDKs: Identity Verification SDK, DocuSign, Google Maps, AdMob, Paging 3, PJSIP - iOS (secondary): Swift, UIKit, RxSwift, Alamofire, Realm - Build & DevOps: Gradle, Github Actions, Play Console - AI Tools: Claude, Cursor

Dedicated Mobile Software Engineer with a strong background in mobile application development and a focus on delivering efficient, user-friendly, and maintainable solutions. Experienced in working with modern Android frameworks, following best practices, and contributing to all stages of the software development lifecycle. My work covers: • Developing new features and improving existing functionality • Writing unit tests to ensure code reliability • Setting up CI/CD pipelines for automated testing, validation, and build distribution • Conducting code reviews and collaborating closely with stakeholders to refine requirements and deliver solutions that meet business goals Tech stack • Android: Kotlin, Jetpack Compose & XML, Coroutines, Hilt/Dagger 2, multi-module architecture • iOS: Swift, SwiftUI & UIKit • CI/CD: GitHub Actions, Fastlane • Additional tools: Firebase, REST APIs, third-party SDK integrations I thrive in small to mid-sized cross-functional teams that include product managers, QA engineers, developers, and designers. My goal is to keep growing in app architecture, testing, and scalable mobile solutions, while contributing to impactful and long-term projects.

Hello! Thank you for visiting my profile. I Have 5+ years of experience💎🏅5-star service💎🏅Upwork verified💎 🏅100% customer satisfaction 5+ years of Mobile App Development experience with proficiency in developing cross-platform mobile apps using Flutter and React Native. I have recently started using Xamarin (C#, .NET) as well to build amazing mobile apps as per the client's requirements. I am an enthusiastic, dynamic, result-driven, and self-sufficient Mobile App Developer with highly-transferable, broad technical skills, having strong professional skills in Cross-platform app development as well as Native development. My Skill Set: ✔ Flutter, Dart, BLoC, Cupertino, Material Design, Flutter Studio, FlutterFlow ✔ React Native, React Navigation, React Native Router Flux as navigation solutions, GEO Location, TOffline data sync ✔ Android app development using Kotlin and Android Java, Android SDK, SQL, SQLite, Tablet applications, Google Play/Playstore Services ✔ iOS app Development using Swift and Objective-C, iOS SDK, CocoaTouch, CocoaPods, iPad/iPod/WatchOS/WearOS, Appstore services ✔ Android Studio, Xcode, Visual Studio Code, IntelliJ IDEA, AppCode ✔ Skilled at building beautiful apps with creative UI fast and easy with Flutter’s innovative method of widgets and libraries. ✔ HTML, CSS, JavaScript, Figma, Adobe XD, Photoshop, Prototyping ✔ Updating or fixing existing applications, feature enhancement, maintenance, and project management ✔ Knows upsides and downsides and best practices of using React Native as well as Flutter ✔ Implementing mockups in mobile applications. ✔ AR & VR ✔ MVVM, MVC, MVP architecture patterns ✔ API design & development, Rest APIs, and integration of various APIs from third parties. ✔ I specialize in React Native using Redux and have developed complex features like React Native animations, GEO Location, Offline data sync, etc. ✔ GitHub, Bitbucket, GitLab, Jira, ASANA, Trello, Slack ✔ Online Video Calls implementation, Jitsi, and Twilio Customisation ✔ Firebase SDK (Authentication, Storage, Notifications, Analytics, etc) ✔ Worked with XMPP protocol to develop chat application (Messaging (XMPP)) ✔ Navigation: react-navigation, react-native-navigation, react-native-router-flux

I'm a passionate and curiosity-driven Software Engineer specializing in Mobile application development with more than 7 years of hands-on experience and a Bachelor's degree in Computer Science. • I will always try to improve your idea by providing suggestions for things that are not clear for you. • Always give my best for each and every app. • I also like to work on projects that use new technology. Mobile Application Development Technical Aspects: - Kotlin, Java, Android Studio - MVP/MVVM - API Integrations - Firebase Integration - Payment SDK integration - Ads SDK Integration (AdMob, Appodeal, inMobi, AppNext, Fyber, MoPub) - Google Maps and other Google's APIs (Maps, Analytics, OAuth) - Social media integration (Facebook, Twitter, Google, Github) - RESTful Webservices (JSON, XML) - UI design with Material Design and Constraint Layout - Most of the commonly used 3rd-party libraries and SDKs. I take pride in my work and stand by its quality. I would love to bring your idea to life and suggest best practices.

Live Video App Development, AI App Development, MVP Development, Video Surveillance, WebRTC & Live Streaming. I help founders and product teams plan, scope, and deliver production-grade video and AI applications with Fora Soft’s senior engineering team. My focus is discovery, product requirements, technical scoping, architecture planning, delivery coordination, and client communication. The engineering work is handled by Fora Soft’s specialized developers, architects, QA engineers, and project managers. Backed by Fora Soft: $10M+ earned on Upwork, 914 jobs, 401K+ hours, and 250+ projects since 2005. 𝗪𝗵𝗮𝘁 𝗜 𝗖𝗮𝗻 𝗛𝗲𝗹𝗽 𝗬𝗼𝘂 𝗕𝘂𝗶𝗹𝗱 – Live video apps, WebRTC platforms, streaming products, webinars, broadcasting, IPTV/OTT – AI video apps: object detection, facial analysis, emotion AI, speech-to-speech translation, captions, LLM assistants – Video surveillance and IP camera platforms: multi-camera ingestion, mobile-as-camera, smart analytics, Smart TV apps – VoIP, UCaaS, SIP, LiveKit, Twilio, Telnyx, FreeSWITCH, real-time communication systems – MVPs, rescue projects, architecture reviews, and modernization of existing systems 𝗥𝗲𝗰𝗲𝗻𝘁 𝗣𝗿𝗼𝗷𝗲𝗰𝘁 𝗘𝘅𝗮𝗺𝗽𝗹es → Nucleus – secure UCaaS platform by Fibernetics, a Canadian telecom serving 300K+ customers and 5,000+ businesses. Fora Soft worked on iOS and platform delivery for WebRTC + SIP audio/video, real-time voice workflows, CRM/ERP integrations, and enterprise-grade communication features. Project volume: $285K+ combined. → TransLinguist – real-time AI interpretation platform for video calls. The platform supports interpretation workflows across 75+ languages, certified interpreter operations, AI speech-to-speech features, and live captions. → Doorbell App – LiveKit SIP-to-WebRTC bridge for smart intercoms. Video and audio from SIP intercoms to a mobile app, low-latency media through LiveKit, and DTMF-based remote door opening. → EmoProof – on-device emotion AI for iOS using Core ML. Real-time facial emotion and voice sentiment analysis on the phone, with privacy-focused processing and journal-style trend stats. 𝗪𝗵𝗲𝗿𝗲 𝗙𝗼𝗿𝗮 𝗦𝗼𝗳𝘁 𝗜𝘀 𝗦𝘁𝗿𝗼𝗻𝗴𝗲𝘀𝘁 – Live streaming & WebRTC: low-latency broadcasting, webinars, multi-camera apps, IPTV/OTT – Video surveillance: IP cameras, mobile-as-camera, smart analytics, Smart TV apps – Real-time AI/ML on video: OpenCV, YOLO, facial analysis, object detection, speech AI, captions – Mobile live video: iOS, Android, React Native, AVFoundation, Camera2 – VoIP & UCaaS: SIP, FreeSWITCH, LiveKit, Telnyx, Twilio, high-load communication systems 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀 𝗢𝘂𝗿 𝗧𝗲𝗮𝗺 𝗪𝗼𝗿𝗸𝘀 𝗪𝗶𝘁𝗵 ◆ Frontend: React, Next.js, Vue, Angular, TypeScript ◆ Backend: Node.js, NestJS, Python / FastAPI, Go, PHP / Laravel ◆ Video: WebRTC, LiveKit, Wowza, Kurento, MediaSoup, Janus, Jitsi, Agora, FFmpeg, GStreamer, HLS/DASH, RTMP/RTSP, SIP, FreeSWITCH, Telnyx, Twilio ◆ AI/ML: OpenAI API, Claude, Whisper, TensorFlow, PyTorch, OpenCV, YOLO, Azure AI Face, Deepgram ◆ Mobile: Swift, Kotlin, React Native, ARKit, ARCore, AVFoundation, Camera2 API ◆ Databases & Infrastructure: PostgreSQL, MongoDB, Redis, Elasticsearch, AWS, GCP, Docker, Kubernetes, NGINX, CI/CD 𝗪𝗵𝘆 𝗙𝗼𝗿𝗮𝗦𝗼𝗳𝘁 Fora Soft is a specialized video, WebRTC, and telecom software team with: – $10M+ earned on Upwork – 914 Upwork jobs – 401K+ hours – 250+ projects since 2005 – 400+ clients across 17+ countries – Deep experience in live video, streaming, VoIP, AI video, and real-time communication Send me a message or invite me to your job. I’ll review your idea, ask the right scoping questions, and suggest the best next step: discovery, audit, MVP planning, or full development.

I help startups and businesses build fast, scalable mobile apps using Flutter and Kotlin. With 3+ years of experience in mobile development, I have built and shipped apps in healthcare, fintech, delivery, and e-commerce. I focus on clean architecture, smooth UI, and reliable backend integrations. What I can help you build: • Flutter cross-platform apps (Android & iOS) • Delivery and logistics apps • E-commerce and marketplace apps • Fintech and payment apps • API integrations and backend connections • Firebase and cloud services • Real-time features (chat, notifications, live updates) Additional Services • Bug fixing and performance optimization • UI implementation from Figma designs • Google Play Store & Apple App Store publishing • App maintenance and feature updates If you're looking for a reliable mobile developer who writes clean, scalable code and communicates clearly throughout the project, feel free to send me a message. I’d be happy to discuss your app idea.

I build high-performance mobile apps using 𝗦𝘄𝗶𝗳𝘁, 𝗞𝗼𝘁𝗹𝗶𝗻, 𝗙𝗹𝘂𝘁𝘁𝗲𝗿, 𝗦𝘄𝗶𝗳𝘁𝗨𝗜, 𝗮𝗻𝗱 𝗝𝗲𝘁𝗽𝗮𝗰𝗸 𝗖𝗼𝗺𝗽𝗼𝘀𝗲. 𝗡𝗮𝘁𝗶𝘃𝗲 𝗶𝗢𝗦/𝗔𝗻𝗱𝗿𝗼𝗶𝗱 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 specialist with cross-platform expertise delivering exceptional user experiences. Developed 50+ mobile applications for startups to enterprises. Expert in Swift iOS development, Kotlin Android apps, Flutter cross-platform solutions, modern UI frameworks SwiftUI and Jetpack Compose. 𝗠𝘆 𝗮𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀 𝗮𝗰𝗵𝗶𝗲𝘃𝗲 𝟰.𝟴+ 𝗔𝗽𝗽 𝗦𝘁𝗼𝗿𝗲 𝗿𝗮𝘁𝗶𝗻𝗴𝘀 𝘄𝗶𝘁𝗵 𝗼𝗽𝘁𝗶𝗺𝗶𝘇𝗲𝗱 𝗽𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲. 💼𝗖𝗼𝗿𝗲 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 𝗦𝗲𝗿𝘃𝗶𝗰𝗲𝘀: ✔Native iOS apps with Swift/SwiftUI featuring smooth animations and iOS design compliance ✔Android applications using Kotlin/Jetpack Compose with Material Design 3 standards ✔Cross-platform Flutter development with single codebase for iOS and Android ✔Modern declarative UI implementation with responsive design and accessibility ✔API integration, real-time features, database optimization, and cloud services ✔Complete App Store and Google Play deployment with ASO optimization 🛠𝗧𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹 𝗘𝘅𝗰𝗲𝗹𝗹𝗲𝗻𝗰𝗲: Clean architecture, MVVM patterns, dependency injection, automated testing, CI/CD pipelines. Proficient with Firebase, AWS, REST APIs, GraphQL, Core Data, Room Database, state management (Provider, Bloc, Combine), and performance monitoring. 🥇𝗥𝗲𝗰𝗲𝗻𝘁 𝗦𝘂𝗰𝗰𝗲𝘀𝘀 𝗦𝘁𝗼𝗿𝗶𝗲𝘀: ✔Fintech app (Swift/SwiftUI) with Face ID authentication serving 25K+ users ✔E-commerce platform (Kotlin/Jetpack Compose) processing $2M+ transactions ✔Healthcare Flutter app with offline sync reaching 75K+ downloads ✔Social messaging app with real-time chat and 99.9% uptime ✔Enterprise productivity suite with advanced analytics dashboard 𝗪𝗵𝘆 𝗖𝗵𝗼𝗼𝘀𝗲 𝗠𝗲: 99% client satisfaction rate, 24-hour response guarantee, detailed documentation, transparent communication, agile methodology, and long-term partnership approach.𝗔𝘃𝗮𝗶𝗹𝗮𝗯𝗹𝗲 𝗳𝗼𝗿 𝘂𝗿𝗴𝗲𝗻𝘁 𝗳𝗶𝘅𝗲𝘀 𝘁𝗼 𝗰𝗼𝗺𝗽𝗹𝗲𝘁𝗲 𝗮𝗽𝗽 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 𝗰𝘆𝗰𝗹𝗲𝘀. Transform your vision into a powerful mobile application. Let's create something extraordinary that users love and businesses profit from. 🚀 𝗞𝗘𝗬𝗪𝗢𝗥𝗗𝗦 𝗦𝗘𝗖𝗧𝗜𝗢𝗡 Swift, Kotlin, Flutter, SwiftUI, Jetpack Compose, iOS Development, Android Development, Cross-Platform Development, Mobile App Development, Native App Development, UIKit, Material Design, Firebase, AWS, Core Data, Room Database, SQLite, Realm, Provider, Bloc, Combine, RxSwift, Dagger Hilt, Retrofit, Mobile UI/UX Design, App Store Optimization, Google Play Store, API Integration, REST APIs, GraphQL, Push Notifications, Biometric Authentication, Payment Gateway Integration, Social Media Integration, Real-time Chat, Location Services, Camera Integration, AR Development, Clean Architecture, MVVM, MVP, MVC, Test-Driven Development, Unit Testing, UI Testing, CI/CD, Git, Agile, Scrum, Code Review, Performance Optimization, Memory Management, Security Implementation