I am a seasoned Senior Mobile Developer with 8+ years of experience in designing and delivering high-performance mobile applications. My expertise lies in Swift, SwiftUI, Objective-C, React Native, and architectural patterns like MVVM and MVC. I excel in building and leading feature teams, mentoring junior developers, and providing technical guidance through the full development lifecycle. I specialize in creating custom UI components, reusable SDKs, and seamless cross-platform integrations while optimizing networking and performance. My experience ranges from leading development for major brands to implementing robust testing frameworks, ensuring smooth production releases. I am eager to leverage my technical expertise and strategic vision in a senior iOS or mobile development leadership role that drives user-centric innovation and application excellence. If you seek a partner in crafting exceptional mobile experiences, let’s connect and discuss how I can contribute to your project.

I am a Mobile Developer with a degree in Computer Science with professional experience in developing Java Web Services applications and testing with the latest testing tools used in development.I develop and maintain mobile applications in iOS and android as well as native applications.I have five years knowledge and experience in mobile development as well as experience and knowledge in HTML and front end development.If you need any assistance with maintenance on java applications or mobile applications, or even need a website or mobile app developed, I am your guy!I am very professional and responsive to all requests and ideas.I am also local to the Washington DC metro area as well.I look forward to servicing your creative endeavors!

Rob Mayer is a seasoned professional technologist with a rich history of developing, consulting on, and leading technology projects across various industries, from startups to established industry leaders. He has lead teams from 3 to 60. He remains a hands-on developer enabling him to contribute to product development and build rapport with technical teams. He founded MyOwlTech to cater to outdoor enthusiasts, leveraging his active participation in activities like outdoor photography, hiking, and fishing. Rob's academic background includes an MBA and a BSEE, equipping him to seamlessly navigate both the technical and business aspects of product delivery. A craftsman with extensive experience spanning decades in technology product development, Rob has worked on end-to-end solutions encompassing mobile apps (Android and iOS), web apps, network security, web services/APIs, and database applications. He has held roles ranging from individual contributor to C-level positions, consistently demonstrating a blend of technical prowess and strategic leadership. Rob excels in customer engagement, adeptly understanding their challenges, opportunities, and operational contexts to deliver solutions that exceed expectations while adhering to budget and timeline constraints. His technical achievements include developing computer-vision facial recognition algorithms, integrating legacy systems into modern web portals, and productizing advanced algorithms for decision support applications. Throughout his career, Rob has been instrumental in revitalizing underperforming development teams by implementing effective personnel changes and rational development processes. His initiatives have significantly increased project throughput, improved product quality, and reduced time-to-market. He has adeptly managed technologies such as Java Services, JSP, C#/.Net Framework, HTML/CSS, C++, SQL, Java for Android, Kotlin, Objective C, Swift, SwiftUI, SpringBoot, and others. Rob's leadership has been pivotal in managing teams responsible for application management products generating annual revenues exceeding $100 million. He has successfully led initiatives to turn around product lines, crafting compelling business cases, assembling cross-functional teams, and implementing robust processes that resulted in substantial revenue growth. In summary, Rob Mayer's career is distinguished by his ability to innovate and deliver transformative technological solutions across diverse domains, consistently driving organizational success through technical excellence and strategic leadership.

I have been in the web and mobile application development business for more than 8 years and have done humongous amount of work in this sector! I specialize in graphic designing, website and mobile application development. In the recent years, I've become highly proficient in Wordpress, Shopify, Magento, iOS and Android Development. I have high repeat hire index. This huge number speaks for itself for my client satisfaction oriented work ethics. If you're not 100% satisfied with my work then I'll refund you the entire amount which you've paid me. However, in the past 8 years of my work, nobody has asked for a refund till now.

AI Engineer & Full Stack Developer with 6+ years of experience building production-grade software systems, now focused on LLM-powered applications, RAG pipelines, AI agents, and intelligent backend systems. I help startups and SaaS companies turn AI models into real, scalable products using Python, FastAPI, vector databases, and modern LLM frameworks. My work focuses on building AI systems that understand, retrieve, reason, and act — not just chatbots or prototypes. 🧠 Core AI Expertise ✔️ LLM Applications (GPT-4/5, Claude, open-source models) ✔️ RAG Systems (Retrieval-Augmented Generation pipelines) ✔️ AI Agents (tool-using, multi-step reasoning systems) ✔️ Vector Databases (Pinecone, FAISS, Weaviate, ChromaDB) ✔️ Embeddings & semantic search architectures ✔️ LangChain & LlamaIndex workflows ✔️ Python + FastAPI backend AI systems ✔️ AI API design & integration ⚙️ AI / ML Stack Python, FastAPI PyTorch (applied ML workflows) TensorFlow (model integration & inference) Hugging Face Transformers OpenAI / Claude / Azure OpenAI LangChain, LlamaIndex Pinecone, FAISS, Weaviate, ChromaDB PostgreSQL, Redis Docker, AWS / GCP deployments 🧩 What I Build ✔️ RAG-based knowledge systems (PDFs, websites, databases) ✔️ AI chatbots with memory & contextual reasoning ✔️ AI agents for automation & decision-making ✔️ Enterprise search systems using vector databases ✔️ AI SaaS platforms with full-stack architecture ✔️ Document intelligence & summarization systems ✔️ AI copilots for internal business workflows ✔️ API-based AI integrations for existing products 💼 Engineering Background Alongside AI engineering, I bring strong full-stack capability: React.js, Next.js Node.js, Express.js REST APIs & GraphQL Authentication & SaaS architecture Admin dashboards & analytics systems Scalable backend design & microservices 🚀 Why Clients Work With Me ✔️ Strong focus on real production AI systems (not demos) ✔️ Deep understanding of LLM + backend architecture ✔️ Experience building scalable SaaS platforms ✔️ Clean, maintainable, production-ready code ✔️ Fast execution and clear communication ✔️ Strong product + engineering thinking 🎯 Ideal Projects I work best on: LLM-powered SaaS products RAG-based enterprise systems AI agents & automation platforms AI search / knowledge systems Custom AI APIs & backend systems Intelligent chatbots with real business logic AI Engineer, LLM Developer, RAG Systems, Retrieval Augmented Generation, AI Agents, Agentic AI, Python Developer, FastAPI, Machine Learning Engineer, Deep Learning, PyTorch, TensorFlow, Hugging Face Transformers, OpenAI API, ChatGPT Integration, Claude AI, LangChain, LlamaIndex, Vector Database, Pinecone, FAISS, Weaviate, ChromaDB, Semantic Search, AI Chatbot Development, Intelligent Automation, AI SaaS Development, Full Stack AI Developer, Backend Developer, API Development, REST API, GraphQL, Node.js, Express.js, React.js, Next.js, SaaS Architecture, Scalable Systems, Cloud Deployment, AWS, Docker, Redis, PostgreSQL, AI Workflow Automation, n8n Automation, Data Pipelines, ML Engineering, AI Product Development AI Engineer, LLM Developer, RAG Systems, AI Agents, Python, FastAPI, Machine Learning, Deep Learning, PyTorch, TensorFlow, OpenAI API, ChatGPT Integration, Claude AI, LangChain, LlamaIndex, Vector Database, Pinecone, FAISS, ChromaDB, Semantic Search, AI Chatbots, AI Automation, SaaS Development, Backend Development, API Integration, Cloud Deployment, AWS, Docker

Expert iOS & Web Developer | Cybersecurity Background | Secure, High-Performance Applications I build secure, user-friendly iOS apps and websites that protect your data and delight your users. With a cybersecurity degree from Penn State Berks, I bring a security-first approach to every line of code, ensuring your applications are not only functional and beautiful, but also protected against vulnerabilities. My expertise includes native iOS development (Swift, SwiftUI), full-stack web development, and implementing robust security measures like encrypted data storage, secure authentication, and API protection. I've successfully delivered apps to the App Store and websites that drive real business results. What sets me apart: I combine technical excellence with clear communication, meeting deadlines while maintaining the highest code quality standards. Your project's security and success are my top priorities. Let's build something secure and exceptional together.

Building a multiplayer game is easy. Building one that scales, stays online, and performs reliably is where most projects fail. I help studios and startups build complete multiplayer game systems—from Unity gameplay to backend APIs, matchmaking, authentication, databases, cloud deployment, LiveOps, and Web3 integration. With 12+ years of software engineering experience and 6+ years specializing in Unity, I develop production-ready game infrastructure instead of quick prototypes. My expertise includes: • Unity Multiplayer Development • Node.js Game Servers • FastAPI & .NET REST APIs • PostgreSQL, SQL Server, MySQL & SQLite • Matchmaking & Real-time Networking • Authentication & Backend Integration • Blockchain & Web3 Integration • Smart Contract Integration • MetaMask, Coinbase Wallet & Thirdweb • AWS & Azure Cloud Deployment • LiveOps Systems • Backend Performance Optimization • VR Applications (HTC Vive) I have successfully delivered more than 20 commercial games and software projects, including multiplayer mobile games, backend systems, VR applications, cloud-connected production environments, and Web3 integrations. I can help you with: • Building multiplayer games from scratch • Custom backend development • Backend integration with Unity • Blockchain & Web3 integration • Wallet authentication & NFT systems • Multiplayer architecture • Server deployment • Database design • Performance optimization • Fixing unstable multiplayer projects • LiveOps infrastructure If your project requires Unity, backend engineering, or Web3 integration, I can deliver the complete technical solution—from prototype to production.

I help startups build technically challenging products that are ready for production from day one. I’m a hands-on CTO, Principal Full-Stack Engineer, and software architect with 15+ years of experience building SaaS platforms, AI products, distributed systems, and high-performance backend services. While I have led engineering teams of 50+ people, I remain deeply involved in architecture, system design, and implementation. What I can help you build • AI-powered SaaS applications • High-performance backend services in Rust or TypeScript • Complex web platforms from scratch • Distributed systems and microservice architectures • Cloud-native infrastructure on AWS • Technical architecture and engineering leadership • MVPs that can scale into production products Selected experience • Built a production-ready ICANN-accredited domain registrar platform from scratch in Rust, including EPP, RDAP, DNS, DNSSEC, payment processing, registry integrations, and the complete domain lifecycle. • Led engineering for an enterprise AI platform indexing Gmail, Slack, GitHub, Notion, Google Calendar, and other business systems to power AI-assisted search and workflows. • Built chart.rs, a high-performance Rust charting engine designed for professional trading applications where rendering performance and low latency are critical. • Designed and delivered SaaS products used by hundreds of thousands of users, including platforms with over one million registered users. • Grew an engineering organization from a small core team to more than 50 engineers while introducing hiring processes, engineering standards, CI/CD, and scalable development practices. Technical expertise Languages: Rust, TypeScript, JavaScript, Python Backend: Axum, Node.js, NestJS, GraphQL, PostgreSQL, Redis, REST APIs Frontend: Angular, React, Next.js Infrastructure: AWS, Docker, Kubernetes, Terraform, CI/CD AI: OpenAI, Anthropic, AI Agents, RAG, LLM integrations Why clients work with me My clients hire me when they need someone who can make architectural decisions, move quickly, and still build software that will be maintainable years later. Whether you need a senior engineer to solve difficult technical problems, a technical lead to guide a team, or a CTO-level partner to build a product from scratch, I focus on delivering software that is reliable, maintainable, and ready for production. Let’s discuss your project.

Need a Senior Mobile Architect who can develop Android and iOS apps in Kotlin Multiplatform or integrate on-device/cloud AI for your mobile apps? With over 9+ years of experience architecting robust and scalable mobile applications. With a deep foundation in native Android development and a current focus on Kotlin Multiplatform (KMP), Compose Multiplatform, and On-Device/Cloud AI integrations (Gemini API, Firebase AI Logic), I help companies build modern, intelligent apps from the ground up. 𝗖𝗼𝗹𝗹𝗮𝗯𝗼𝗿𝗮𝘁𝗶𝗼𝗻, 𝗛𝗼𝘂𝗿𝘀 & 𝗖𝗼𝗺𝗽𝗹𝗶𝗮𝗻𝗰𝗲: I operate via my US-registered LLC (Simple Technologies) offering seamless B2B/C2C contracting for US clients, or full-time international engagements. I offer complete timezone adaptability to ensure zero friction with US or global teams. Whether your engineering team requires a full US schedule or strategic daily overlap for agile activities (stand-ups, retro, etc.), I adapt to your preferred workflow. 𝗖𝗮𝗿𝗲𝗲𝗿 𝗛𝗶𝗴𝗵𝗹𝗶𝗴𝗵𝘁𝘀:   • 𝗦𝗰𝗮𝗹𝗲 & 𝗥𝗲𝘃𝗲𝗻𝘂𝗲: Launched a successful Android app for an e-commerce company (acquired by Woolworths), driving over 500K+ installs and $3M+ in platform-specific revenue   • 𝗗𝗲𝘃𝗢𝗽𝘀 & 𝗧𝗲𝗮𝗺 𝗠𝗲𝗻𝘁𝗼𝗿𝘀𝗵𝗶𝗽: Established the team's CI/CD pipeline via Bitrise and mentored a team of 50+ developers through technical workshops, peer reviews and authoring internal technical documentations   • 𝗤𝘂𝗮𝗹𝗶𝘁𝘆 & 𝗥𝗲𝗹𝗶𝗮𝗯𝗶𝗹𝗶𝘁𝘆: Architected a robust testing suite for an Android app in the construction industry, reducing bugs and accelerating feature deployments by ~50%   • 𝗧𝗵𝗼𝘂𝗴𝗵𝘁 𝗟𝗲𝗮𝗱𝗲𝗿𝘀𝗵𝗶𝗽: Authored two comprehensive Android development books (400+ in combined sales) covering Kotlin, MVVM Architecture, and Jetpack   • 𝗖𝗼𝗺𝗺𝘂𝗻𝗶𝘁𝘆 𝗜𝗺𝗽𝗮𝗰𝘁: Guest speaker at over 5 Google events (Google I/O Extended, Google Campus Talks) presenting to audiences of 1,000+ on Kotlin and modern architecture 𝗖𝗼𝗿𝗲 𝗧𝗲𝗰𝗵 𝗦𝘁𝗮𝗰𝗸: Android, Kotlin Multiplatform (KMP), Compose Multiplatform (CMP), MVVM/Clean Architecture, Coroutines & Flow, Retrofit/Ktor, Hilt/Dagger/Koin, Room, Firebase AI Logic, LLM Integration Send me a message with a brief overview of your app idea or feature needs, and let's discuss the most efficient way to execute it.

I'm a Solution Architect with over 18 years of experience in software development and mobile application design for iOS, Android, and web platforms. I've successfully led teams of over 50 professionals, delivering intricate projects and resolving complex challenges for major banks and corporations. 💼 Fintech Expertise In the Fintech sector, I've developed secure applications for leading banks in Pakistan and the GCC, focusing on payment gateway integration 💳 and data encryption 🔒. 🔧 Core Skills ⚙️ Software Development: QT, Python, C++, GoLang, LibUsb 📱 Mobile Development: Objective-C / Swift (iOS), Java / Android SDK 🖥️ Backend Solutions: Java, Spring Boot, Node.js, PHP / Laravel 🌐 Web Technologies: JavaScript, TypeScript 📲 Hybrid Applications: Ionic, PhoneGap 💳 Secure Payment Systems: Stripe, Authorize.net 📞 Communication Technology: iOS CallKit, Twilio ☁️ Cloud & Databases: Firebase, DynamoDB 🎯 Why Choose Me? 👥 Proven Leadership: Successfully led teams of 50+ in delivering intricate projects. 🏦 Fintech Authority: Trusted expert in solving critical issues for major banks. 💡 Innovative Problem Solver: Crafting client-focused, efficient solutions. 🔭 Versatile & Forward-Thinking: Expert in both core and emerging technologies.