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Need a fast, scalable iOS app built with SwiftUI — or help fixing a messy codebase? I help startups and growing companies build production-ready iOS apps with clean architecture, smooth performance, and App Store–ready polish. Recent results: 🚀 Top 100 Kids Paid app on the App Store 💰 $400K+ earned | 10,500+ hours on Upwork ✅ 200+ successful projects with long-term clients 💡 What I can help you with: SwiftUI & UIKit app development (from MVP to scale) Refactoring and modernizing legacy iOS codebases Subscription systems & In-App Purchases Performance optimization & architecture improvements API integration & scalable backend connectivity App Store submission, compliance & launch support 🎯 Who I work best with: Startups and teams that need a reliable senior iOS developer who thinks beyond code — focusing on scalability, performance, and long-term product quality. If you want clean code, clear communication, and fast execution — let’s talk.

🏆 𝗧𝗢𝗣 𝗥𝗔𝗧𝗘𝗗 𝗣𝗟𝗨𝗦 🏆 ✅ Mobile App Developer 7+ years of experience ✅ SaaS Mobile App Developer 5+ years ✅ 35 mobile app development jobs completed successfully ✅ Android and iOS Mobile Expert ✅ Built 27+ UX-first Mobile App development jobs for 22 companies ✅ On-Time and Cost-Effective Delivery ✅ Future-Proof Solutions Showing a Minimum 41% ROI ✅ 4354 mobile app development hours on Upwork and still counting ✅ 100% Job Success in mobile app development (Client Satisfaction Ratio) ✅ 98% of Clients Recommended working with me ✅ 80% Long-term Repeat Clients ✅ 7+ years of experience in mobile app development, 6 years experience in iOS mobile app development, 7 years experience in Swift and Kotlin, 4 years experience in Flutter, React Native, 2 years experience in KMM, KMP Full stack mobile app developer and mobile app UI UX designer with 7+ years of experience in Mobile App Development, specializing in iOS, Swift, Android, Kotlin, KMM, Kotlin Mutliplatform / KMP, React Native, and Flutter. I have successfully delivered 120+ mobile applications in different roles as mobile app developer, flutter app developer, flutter full stack developer, flutter flow, mobile app design, mobile ui ux designer, swift ios developer, android developer, kotlin developer, react native developer, mobile game developer achieving a 5-star rating on Upwork and helping clients scale their businesses with high-performance solutions. Apart from mobile app development, I specialize in Mobile App Design for both iOS and Android, as well as Web App Design for SaaS platforms. My expertise extends to Interaction Design, User Flow Design, and creating seamless User Experience (UX Design) and User Interface (UI Design). I follow a Design Thinking approach, ensuring every solution is user-centered and problem-solving. My process includes UI/UX Wireframing, Prototyping, and building Style Guides or UI-kits for consistent branding. I perform Design Audits and Design QA to maintain high standards across all projects. 🛠️ Design Tools: My designs come to life through powerful tools like Figma, Zeplin, and InVision for prototyping and collaboration. I leverage Adobe Illustrator, Adobe Photoshop, and Adobe XD for detailed visual design. For complex wireframes and flow mapping, I turn to Axure, Sketch, and Balsamiq. I also use Miro and Abstract for brainstorming and version control, while project communication and management happen in Slack and Jira. Our Expertise at a Glance • Mobile App Development: Android, iOS, & Cross-Platform App Development using Java, Kotlin, Swift, Objective C, Flutter, and more. • Website and Full Stack Development: Crafting seamless back-end experiences with .Net, Python, Java, Javascript, React.js, Angular.js, Node.js, MERN, MongoDB, PHP, etc. • Logo & UI/UX Design: Bringing your ideas to life with Adobe XD, Photoshop, Sketch, Figma, etc. • End-to-End Solutions: From logo design, UI/UX development, workflow setup, testing to deployment in app stores, we've got it all covered. We do not use v0.dev lovable.app CursorAI, Cursor, Windsurf, Trae, GitHub Copilot, Tabnine, Qodo, Devin AI, and AutoDev for speed up coding, we know other methods to do it efficiently. We offer a comprehensive range of development services across mobile, web, and cloud platforms. Our mobile app development expertise includes building Android and iOS applications using technologies such as Flutter, Swift, Objective-C, React Native, and Xamarin, optimized for both smartphones and tablets with a focus on cross-platform compatibility. In website and full stack development, we work with .NET technologies, including full stack .NET development, .NET Core, and Python with Django. Our team is experienced in developing both backend systems and user-friendly, responsive web interfaces, as well as working with various CMS platforms. Our DevOps and DevSecOps capabilities cover cloud infrastructure and automation, leveraging tools like AWS, Azure, Docker, Kubernetes, GitLab CI, Ansible, and Terraform to build secure and scalable deployment environments. We also build cross-platform and web applications using frameworks like Three.js and design tools such as Webflow, creating visually engaging and functional user experiences across devices. Additionally, we are well-versed in integration and automation tools, including WebSockets, data integration, the ABP Framework, Discord API, and Autotask, allowing us to create seamless connectivity and workflow automation between systems. Talent Good Knowledge, Talented, Experienced, Skilled, Strong Experience, Proven Experience, Agency, Team, Company, Specialist, Proven Track Record, Strong Background, Write Clean Code, Deep Expertise, Bring to Life, Cross-platform, Attention to Detail, Long Term. ⚡️ AVAILABLE FOR NEW PROJECTS ⚠️ Press Invite Button on my page and let's talk.

From concept to launch, I build production-grade mobile applications that are scalable, secure, and built to deliver real business results. I’m Hardeep, an experienced Mobile App Developer with over 10 years of hands-on expertise creating high-performance mobile apps for startups and enterprises. I specialize in native iOS and Android development, as well as React Native, with a strong focus on AI-driven features and modern app architectures. Whether you’re launching an MVP or scaling an existing product, I help transform ideas into reliable, user-friendly mobile experiences that perform exceptionally well in real-world conditions. ==> Mobile Development Expertise: ------------------------------------------ I work extensively with iOS (Swift), Android (Kotlin), React Native, and Flutter to build fast, responsive, and maintainable mobile applications tailored to your business goals. ==> AI-Driven Features & Integrations: --------------------------------------------- I integrate AI capabilities such as LLM APIs (GPT, Llama), conversational AI, and predictive models to enhance user engagement, automation, and decision-making within mobile apps. ==> Industry Experience: ------------------------------ I have delivered successful solutions across multiple domains, including FinTech, Healthcare (HIPAA-compliant apps), video streaming, subscription-based platforms, social and dating apps, and real estate solutions. ==> Payments, Streaming & Infrastructure: -------------------------------------------------- My experience includes payment gateway integrations (Stripe, PayPal, Apple Pay, Google Pay), subscription systems, in-app purchases, and real-time video streaming using WebRTC, Twilio, Zoom, and Agora. I also handle CI/CD pipelines, app distribution, and cloud-backed mobile infrastructures. ==> How I Work: ------------------- I follow Agile development practices, prioritize clear communication, and provide regular updates throughout the project lifecycle. My code is clean, scalable, and designed to support long-term growth and future enhancements. If you’re looking for a reliable mobile app developer who understands native and cross-platform development and can seamlessly integrate AI-powered features, I’d be glad to collaborate. Let’s build a high-performing mobile app that users love and businesses trust.

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

✅ EXPERT Top Rated Mobile App Developer. ✅ 6 plus years of experience in Mobile App Development. ✅ Completed 100+ projects on different Freelance platforms as an iOS/Android mobile app developer. ✅ 100 % Client Satisfaction & Highly Recommended Freelancer by Clients. ✅ Fluent in English. ✅ 24/7 Availability. ✅ Best Service Provider in Native Android Kotlin, Flutter dart & Android/IOS App Developer. ✅Self-directed and motivated technical mobile app developer with 6+ years of experience. I have excellent knowledge, solid background & a complete understanding of the whole process of Android/IOS Mobile App development (from concept to release). I can work independently and respect a deadline. I have worked with US, UK, Singapore, Germany, UAE, and Saudi Arabia companies on building mobile application solutions according to the businesses of startups and companies. As an Android app developer, Already developed & published many mobile apps, all by myself, coding and design ✅Stack of technologies that I am using for Native Android app development: ⭐MVC / MVVM / MVP (A strict follower of Design Patterns) ⭐Multiple-language support ⭐Unit Testing ⭐Instrumented Testing ⭐API Integration ⭐Android SDK ⭐Android Jetpack compose & components ⭐Android Dependency injection - Dagger, Hilt, Kodien ⭐RxAndroid ⭐Third-party libraries ⭐WorkManager ⭐Android Pagination ⭐Navigation ⭐Room for database ⭐Native Android ⭐Payment Gateways ⭐In-App Purchases ⭐Stripe and PayPal ⭐Multiple-Sensor support ⭐Bluetooth Communication ⭐Restful API ⭐Firebase ⭐Push Notifications ⭐Fragments ⭐SQL lite ⭐Services ⭐Broadcast Receivers ⭐Google Maps ⭐Social Logins ⭐Content providers ⭐AdMob ⭐Material design ⭐Gradle for Android, Gradle for Java. ⭐Support library (CardView, RecyclerView) ⭐SQL. ⭐XML. ⭐JSON. ⭐Widgets ⭐ And Many more ⭐Also Experienced in Both Native & Hybrid iOS/Android mobile app development using Kotlin/Java/ Swift / Flutter Dart. ✅ Core Qualification: ⭐Native Android App Development (Java, Kotlin) ⭐Native IOS App Development (Swift) ⭐Flutter Dart App Development ⭐UI/UX designing/prototype implementation ⭐Professional Full stack mobile app developer ⭐Expert in Agile methodologies & Scrum Master ⭐Writing Clean and Easy to maintainable and scalable code ⭐Best Team Player in mobile app development ✅ Tools - Using for mobile app development: ⭐Android Studio ⭐Xcode ⭐Version Control System(VCS): GitHub, GitLab,Bitbucket ⭐Jira ⭐Team Foundation Server (TFS) ⭐SQL Server ⭐Trello ⭐Asana ⭐ I will finish any iOS/Android mobile app development project no matter what it is and eager to complete high-end projects in deadline-oriented environments. My main goal is to create high-quality, efficient applications. ✅You may contact me at any time to discuss Android app development requirements anytime! I'll be happy to help with a consultation. ⭐Thanks for visiting!

Android Developer | Kotlin & Java Expert | 7+ Years of Experience 🚀 Passionate Android Developer with over 7 years of hands-on experience in designing, developing, and deploying high-performance mobile applications. I specialize in building scalable, maintainable, and user-friendly apps using Kotlin and Java, following modern Android architecture and best practices. Key Expertise: ✅ Android SDK – Deep understanding of core Android components and architecture. ✅ Jetpack & MVVM – Best practices for modern, scalable app development. ✅ REST API Integration – Efficient network communication with Retrofit/Volley. ✅ Payment Gateway Integration – Stripe, PayPal, Google Pay, and in-app purchases. ✅ Google Play Console – End-to-end app deployment and management. ✅ Multi-Screen & Adaptive UI – Responsive layouts for all devices. ✅ Room Database & Firebase – Robust offline storage and real-time syncing. ✅ Push Notifications – GCM/FCM implementation for engagement. ✅ Google Fit & Google Maps API – Seamless health and location-based services. ✅ Google Drive API – Cloud storage solutions within apps. ✅ Ad Network Integration – AdMob, Facebook Ads, Unity Ads, and more. ✅ Why Choose Me? I write clean, modular, and testable code that ensures long term maintainability and easy feature expansion. Whether you're building a native Android app I can help you ship robust, production ready solutions faster. Let’s bring your idea to life across platforms! 🌐📱🚀