40 Projects Completed | 5 start rating | 100% Job Success Score | Top Rated 🏅 Senior Mobile Developer with experience architecting and delivering complex, business-aligned mobile-first systems and MVPs - taking full ownership from initial concept through scalable production using AI tools like Claude and Gemini for accelerated development. Specialised in both Android and iOS Native for maximum performance and the smoothest app experience with pixel-perfect UIs. Clients rely on my business-first approach: rapid launches powered by intelligent AI workflows, strategic guidance rooted in clean, robust code, and scalable technology that evolves with their long-term goals. 🚀 Tech Stack & Tools: 🛠️ AI & AI Integration: Gemini API, Claude API, OpenAI API (ChatGPT) AI-powered feature development and smart app integration 🛠️ Mobile Development: Kotlin, Jetpack Compose, Swift, SwiftUI Native Android & iOS development 🛠️ Backend & APIs: Firebase (Auth, Firestore, Cloud Functions), REST APIs, third-party integrations, deep linking, push notifications 🛠️ Architecture & Engineering: Clean Architecture, MVVM, performance optimization, scalability, App publishing (Google Play & App Store) 🛠️ Product Design: Figma Pixel-Perfect UI implementation, Figma to Code Why Partner with me? I will take you all the way from idea to first revenue, so you don't juggle specialists - perfect for any founder needing rapid, scalable MVPs that support marketing, analytics & growth. 100% IP handoff, fluent English, and collaborative via Slack/Jira. Let’s catch up and focus on what matters for your first release. Nikola Gocić ___________________________________________________ EXPERTISE: Native Android Development | Native iOS Development | Kotlin | Jetpack Compose | Swift | SwiftUI | Firebase Integration | AI Integration | OpenAI | Gemini | Claude | REST API Integration | Clean Architecture | Figma to Code | Push Notifications | Deep Linking | App Publishing | Google Play Store | Apple App Store | Mobile UI/UX Design

I am a seasoned mobile app developer with over 7 years of experience building high-performance, scalable, and user-friendly apps for both iOS and Android. Whether you need a cross-platform MVP or a fully-featured native application, I bring the skills and experience to bring your vision to life. ⸻⸻⸻⸻⸻ ✪✪ What I Can Help You With: ✪✪✪ ⇢ Cross-Platform Development using Flutter & React Native ⇢ Native iOS Apps using Swift / SwiftUI ⇢ Native Android Apps using Kotlin / Java ⇢ API Integration & backend connectivity ⇢ In-app purchases, payment gateways, subscriptions ⇢ App debugging, optimization, & performance tuning ⇢ Testing & Deployment to App Store & Google Play ⇢ UI/UX Implementation based on Figma or custom designs ⸻⸻⸻⸻⸻ ✪✪ Why Clients Choose Me: ✪✪ ⇢ Detail-oriented with clean, maintainable code ⇢ Always meet deadlines with clear communication ⇢ Passionate about delivering smooth, modern mobile experiences ⇢ Able to work independently or collaborate with teams I have successfully worked with startups, entrepreneurs, and established businesses to turn ideas into top-rated apps. Whether you’re starting from scratch or need help improving an existing app, I’m here to help you succeed. ⸻⸻⸻⸻⸻ 📩 Let’s connect and discuss how I can bring your app idea to life!

Hi, I’m a dedicated Android & iOS developer with 3 years of experience building practical, user-friendly apps. I specialize in Java, Kotlin and the Android SDK, and I follow best practices using MVVM architecture, Firebase, and REST APIs. 😎 In addition to native Android development, I have strong experience in cross-platform app development using Flutter and FlutterFlow. I’ve built and deployed scalable apps for both platforms, integrating Firebase services like Authentication, Firestore, Cloud Messaging, and Analytics to power real-time, secure, and engaging user experiences. Tech stack/Latest experience: ✅ Flutter: Cross-platforming development of IOS/Android applications. ✅ Android: Crafting seamless and intuitive mobile experiences for the Android platform. ✅ React & Angular: Designing responsive and feature-rich web applications using popular frontend frameworks. ✅ Java 17: Harnessing the power of Java to build robust and scalable mobile applications. ✅ Kotlin: Utilizing Kotlin's modern features for efficient Android development. ✅ Spring & Spring Boot: Developing scalable and high-performance web applications with the Spring framework. ✅ REST: Building RESTful APIs for seamless communication between web services. ✅ Quarkus: Leveraging Quarkus for lightweight and fast Java-based microservices. ✅ Kafka: Implementing event-driven architecture for real-time data processing and streaming. It would be great to speak more with you and receive the necessary info about the rapid job with short timeline or comprehensive and high-complexity long-term project. Now I am expanding my portfolio, a lot of works under NDA – so for now I need to create an Upwork portfolio – and apply my 10+ years high-level experience 🤩 Let's have a quick talk and discuss everything! 🤝

I started his career as a programmer in Delphi, I work more than 15 years. There are also skills in C # (winforms) . (MSSQL, Oracle, MySQL, SQLite, PostgreSQL), also has skills with api functions, sound, theards etc. Working with REST API, like Elation, SureScript. Wrote simple backend server. Mobile develop on Delphi and Kotlin Compose. Have skill with https, ftps, sftp (etc) protocols.

𝗦𝗼𝗳𝘁𝘄𝗮𝗿𝗲 𝗲𝗻𝗴𝗶𝗻𝗲𝗲𝗿 𝘄𝗵𝗼 𝘀𝗵𝗶𝗽𝘀 — 𝟭𝟬+ 𝗮𝗽𝗽𝘀 𝗹𝗶𝘃𝗲 𝗼𝗻 𝗚𝗼𝗼𝗴𝗹𝗲 𝗣𝗹𝗮𝘆 𝗮𝗻𝗱 𝘁𝗵𝗲 𝗔𝗽𝗽 𝗦𝘁𝗼𝗿𝗲, 𝘇𝗲𝗿𝗼 𝗿𝗲𝗷𝗲𝗰𝘁𝗶𝗼𝗻𝘀, 𝘇𝗲𝗿𝗼 𝗳𝗮𝗶𝗹𝗲𝗱 𝗱𝗲𝗹𝗶𝘃𝗲𝗿𝗶𝗲𝘀. I work across two areas that share one principle — clean, maintainable code that actually ships: 𝟭. 𝗠𝗼𝗯𝗶𝗹𝗲 (my core): Native Android in Kotlin and cross-platform with Kotlin Multiplatform, from MVP to complex multi-module codebases. This is where most of my 10+ published apps live, including a 20+ module app with real-time video calling. 𝟮. 𝗣𝘆𝘁𝗵𝗼𝗻 & 𝗔𝗜: I hold a master's in AI — my research built a medical image-classification system (skin cancer detection) using ensemble learning and TensorFlow/Keras. I apply that to ML, data processing, automation/scripting, and wiring AI APIs (OpenAI and similar) into real products. The reason both work: I bring product-engineering discipline most freelancers don't — Clean Architecture, version control, testing, and code you can maintain after I hand it off. I don't just write scripts that run once; I build software that lasts. 𝗪𝗵𝗮𝘁 𝗜 𝗗𝗼 Android: Kotlin, Jetpack Compose, Clean Architecture (MVI/MVVM), multi-module, Coroutines & Flow Kotlin Multiplatform: 60–80% shared code across Android & iOS, published to both stores Python & ML: TensorFlow/Keras, image classification, data processing (Pandas/NumPy), automation & scraping AI integration: OpenAI API and similar, shipped in production apps Real-time & backend integration: Agora SDK, Firebase, WebSockets, REST APIs, Room/SQLite Publishing: full lifecycle to Play Store & App Store — I know both review processes cold 𝗧𝗲𝗰𝗵 𝗦𝘁𝗮𝗰𝗸 Mobile: Kotlin, Jetpack Compose, KMP, Material 3, Coroutines/Flow, Koin/Hilt, Room Python: TensorFlow, Keras, NumPy, Pandas, automation/scripting, python-docx; FastAPI (actively building) Architecture: Clean Architecture, MVI/MVVM, multi-module Other: Firebase, Agora SDK, REST/Retrofit, Flutter (cross-framework versatility) 𝗦𝗲𝗹𝗲𝗰𝘁𝗲𝗱 𝗪𝗼𝗿𝗸 PHIX Job Portal — 20+ module Android app, Clean Architecture, real-time video (Agora SDK), Firebase Auth, live messaging. Memento Event Tracker — Kotlin Multiplatform, shipped to both Play Store and App Store. Moodifier AI — production AI mood-analysis app with OpenAI API integration, monetized with AdMob, published globally. Medical AI research — skin cancer detection via ensemble learning (CNN ensembles, ConvMixer + CatBoost) on dermoscopic images; full pipeline from raw data to evaluated model. CoreDroid Lite — 10+ module device-info app with custom Gradle convention plugins. Data & automation tooling — dataset conversion (CSV → SQLite), automated document generation, bot/scraping scripts. 𝗪𝗵𝘆 𝗖𝗹𝗶𝗲𝗻𝘁𝘀 𝗖𝗵𝗼𝗼𝘀𝗲 𝗠𝗲 Zero rejection rate across both stores — I've helped multiple clients publish successfully and coordinated closed testing without extra back-and-forth. Rated "Clear Communicator" and "Committed to Quality" by every client. Message me with your project details and I'll reply within 8 hours with a clear plan, honest timeline, and a fair estimate.

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

**** Expert Android App Developer, Senior Mobile App Developer, Android App Development Specialist, Kotlin Developer, Expert Android App Developer, Senior Mobile App Developer, Expert Android App Developer, Expert Kotlin Developer, Expert Android App Development , Android App Developer, Mobile App Developer, Android App Development pro **** Hi, I’m a Android app developer and specializing in Android Studio development, Kotlin-based Android apps, Figma UI/UX design, and responsive website creation. I help startups, founders, and digital businesses bring their ideas to life with clean architecture, intuitive user flows, real-time features (Firebase, REST APIs), and AI-ready functionality. I also ensure seamless deployment, cross-platform performance, and modern design standards for mobile and web platforms. I am a highly skilled and Android App Developer and iOS developer with expertise in mobile app development for both Android (Kotlin/Java) and iOS (Swift/Objective-C) platforms. I’m an experienced iOS developer with deep expertise in building high-quality, scalable apps using Swift and Objective-C. From intuitive UI design to seamless backend integration, I focus on delivering smooth, reliable, and user-friendly iOS experiences specialize in building robust, scalable apps and delivering seamless user experiences. What I Can Do for You: ✔️ Android mobile app development (iOS + Android) ✔️ UI/UX design in Figma – pixel-perfect and user-focused ✔️ Web app development (responsive, fast, modern) ✔️ Integration with Firebase, REST APIs, and scalable backends ✔️ AI features – ChatGPT, image detection, voice input, OCR ✔️ Real-time updates, push notifications, in-app purchases, and more Why Work With Me: • 5+ years of real-world experience in app and web development • Expertise in KMP, Firebase, and Figma workflows • Strong sense of UX, accessibility, and performance optimization • Transparent, deadline-driven, and great with communication • From MVPs to full products , I’ve done it all I specialize in these high-quality Mobile App Designing and Development areas: - Android app development - Kotlin, Java, Android SDK, Android Studio - iPhone app development - Swift, SwiftUI, Objective C, iOS SDK, XCode - Backend Development Python - UI/UX: Mobile design - Mobile & Web app design - UX/UI design - Landing page design Let’s create mobile or web experiences that stand out, and deliver real results. Click the “Invite” or “Message” button, and let’s talk about how I can help with your project. Thanks and Best Regards, 𝐌𝐚𝐫𝐭𝐢𝐧𝐬 𝐄𝐝𝐢𝐝𝐣𝐚𝐧𝐚 Expert Android App Developer, Senior Mobile App Developer, Android App Development Specialist, Kotlin Developer, Expert Android App Developer, Senior Mobile App Developer, Expert Android App Developer, Expert Kotlin Developer, Expert Android App Development , Android Studio App Developer, Android App Developer, Mobile App Developer, Android App Development pro, Expert Android App Developer, Senior Mobile App Developer, Android App Development Specialist, Kotlin Developer, Expert Android App Developer, Senior Mobile App Developer, Expert Android App Developer, Expert Kotlin Developer, Expert Android App Development , Android Studio App Developer, Android App Developer, Mobile App Developer, Android App Development pro, Expert Android App Developer, Senior Mobile App Developer, Android App Development Specialist, Kotlin Developer, Expert Android App Developer, Senior Mobile App Developer, Expert Android App Developer, Expert Kotlin Developer, Expert Android App Development.

I help startups and businesses build high performance mobile apps using Flutter and Native Android with Kotlin, from early MVP stage to fully scalable production apps. I also help brands build and grow their Shopify stores with custom development, theme customization, and conversion focused optimization. Whether it is a new store setup or improving an existing Shopify store, I focus on performance, user experience, and sales. I have worked on multiple production apps used by thousands of users, including eCommerce apps, on demand apps, real time chat apps, and SaaS based mobile platforms. My focus is always on scalability, performance, and clean architecture. With 8 plus years of experience and a 100 percent Job Success Score on Upwork, I specialize in Flutter app development, Android app development, bug fixing, app performance optimization, and scaling apps for real users. From MVP to scaling, I focus on writing clean and maintainable code that supports long term product growth. +What I can help you with - Flutter app development for iOS and Android - Cross platform mobile app development - Native Android app development using Kotlin and Java - Mobile app UI and UX implementation - API integration and REST API development - Payment gateway integration including Stripe, Razorpay, and in app purchases - Real time app development with chat, WebRTC, and live streaming - Firebase integration including authentication, Firestore database, and push notifications - Mobile app performance optimization and crash fixing - Maps integration using Google Maps and MapBox for delivery and tracking apps - On demand app development and booking apps - eCommerce mobile app development - Code refactoring and architecture improvement - App Store and Google Play app deployment +Shopify services - Shopify store development and customization - Shopify theme customization using Liquid - Shopify app integration and custom features - Shopify speed optimization and performance improvement - Shopify product setup, payment setup, and store management Conversion rate optimization for Shopify stores +Technical expertise - Languages Kotlin, Java, Dart, SQL, Liquid - Mobile development Flutter, Android SDK, Kotlin Coroutines, RxJava - Architecture and patterns Clean Architecture, MVVM, MVI - Integrations and services Firebase, WebRTC, Twilio, AdMob, Google Maps, MapBox, Shopify APIs, REST APIs - Databases SQLite, Room, DataStore - Tools Android Studio, Git, GitHub, Jira, Trello, Swagger, Figma, ChatGPT +How I work - I focus on scalable mobile app development so your app can grow without breaking - I keep communication simple and clear with regular updates - I prioritize app performance, fast loading, and smooth user experience - I deliver reliable work with realistic timelines I do not just write code. I help build mobile apps and Shopify stores that are stable, scalable, and ready for real users. Let’s build something great. If you are looking for a Flutter developer, Android developer, or Shopify developer who understands both tech and business, feel free to message me. Best regards Pranjul D. 🔑 𝐊𝐞𝐲𝐰𝐨𝐫𝐝𝐬: Flutter developer | Mobile app developer | App development | App development company | Mobile app development company | Android app development | Mobile application development | Freelance app developer | Flutter app development | Flutter app | Flutter mobile app | Flutter application | Flutter mobile application | Flutter mobile app developer | Full stack flutter developer | Flutter app | Flutter app developer | AI app developer | Flutter Supabase | Mobile app development | MVP app development | MVP App developer | application developer | Ai application developer | Full stack developer flutter | Flutter expert | MVP developer | MVP app developer | Fitness app developer | AI mobile app developer | Hire Mobile app developer | Hire iPhone developer | Android app developer | iOS app developer | iPhone app developer | Swift | iPad app developer | iOS development | Fitness app developer | App developer | Ai Mobile app developer | Mobile application develper | AI App developer | App developer | MVP App developer | Real estate app development | Healthcare app development | App Development | AI App developer

As a senior Android developer with +7 years of experience, I have a proven track record of developing high-quality mobile apps across a variety of industries. I have built TV apps, e-commerce apps, financial apps, NFC and Bluetooth apps, educational apps, Trivia apps, Navigation apps, health apps, chat apps, and social media apps. I possess a deep understanding of the Android platform and its various components, and I am proficient in Java and Kotlin programming languages. I am knowledgeable in mobile app development best practices, such as design patterns. Additionally, I have experience working with third-party libraries and APIs commonly used in Android development. I am capable of developing user-friendly mobile apps that meet business objectives and possess strong problem-solving and communication skills. I have a demonstrated ability to work collaboratively with cross-functional teams, including designers, QA engineers, and product managers

I help teams design and ship mobile applications for Android and iOS. My core background is native Android (Kotlin, Java), and cross-platform (Flutter & React Native). I've delivered 20+ commercial apps across fintech, social, maps, logistics, and entertainment. I cover the full cycle: architecture, feature development, testing, performance optimization, and post-release support. 🎯 What I work on: - New apps from scratch - UI/UX implementation - Architecture improvements - Crash fixes & stability - Release automation - Firebase/Analytics integration - API/backend integration - AI integration 🛠 Architecture: MVVM, MVP, Clean Architecture 🧩 Technologies and Libraries: - Android: Kotlin, Java, Jetpack Compose, Android SDK, Dagger/Hilt, Room, Retrofit, OkHttp, Coroutines, Flow - Flutter: Dart, BLoC, Provider, Riverpod, GetX - React Native: JavaScript, TypeScript, Redux, Expo - Firebase: Crashlytics, Analytics, AdMob, A/B testing, Cloud Messaging - Testing: JUnit, Mockito, Espresso, Robolectric - Git: GitHub/GitLab, Bitbucket, Mercurial 🤖 How I use AI I use AI as a productivity tool to speed up repetitive engineering work, but I never deliver raw AI-generated output. I focus on scalable, maintainable, and high-performance applications, delivering projects that meet both user expectations and business goals. If you are looking for someone who can build Android features or improve app quality - contact me.