I am a Senior Full Stack & AI Developer with deep expertise across the complete .NET ecosystem, Node.js, Next.js, React, Angular, Blazor, cloud platforms (AWS, Azure, GCP), and AI-powered application development solutions. As a Top Rated Plus freelancer with 8,000+ hours on Upwork and over a decade of hands-on experience, I specialize in building end-to-end software solutions across web, mobile, and desktop platforms. My work focuses on production-grade systems that are scalable, secure, and aligned with real business workflows. I do not build demos. I build systems that businesses rely on. --- My Skills & Expertise Full Stack Application Development I design and develop complete applications from architecture to deployment, covering backend logic, frontend interfaces, APIs, databases, and cloud infrastructure. I take ownership of the full lifecycle rather than isolated tasks. .NET & Microsoft Ecosystem I work across the entire .NET stack to build enterprise-level applications using clean architecture, modular design, and long-term maintainability principles. AI-Powered Application Development I integrate AI directly into applications to enhance automation, decision-making, search, and user interaction (AI used as a functional system component, not a surface feature). AI Agents, Chatbots & RAG Systems I build intelligent agents and conversational systems using Retrieval-Augmented Generation for context-aware responses, internal tools, and customer-facing platforms. Cloud Architecture & DevOps I deploy and manage applications across Azure, AWS, and GCP with a focus on scalability, cost control, security, and production stability. Automation & Workflow Orchestration I automate business processes and AI workflows using modern automation platforms to reduce manual work and improve operational efficiency. Database Design & Data Handling I design efficient, scalable data models and manage structured and unstructured data for high-performance applications. --- Core Technology Stack Backend & Application Frameworks • .NET Framework • .NET Core • ASP .NET • ASP .NET MVC • ASP .NET Web API • Node.js • Next.js • Blazor Server • Blazor WebAssembly • .NET MAUI (cross-platform mobile and desktop apps) • C# (primary language), JavaScript, TypeScript Frontend Technologies • Angular • Blazor • React • HTML, CSS, JavaScript (modern standards and performance-focused UI) AI & Intelligent Systems • OpenAI APIs • AI-powered application development • AI Agents & Chatbots • RAG (Retrieval-Augmented Generation) systems • LangChain • LangGraph • Vector databases • Context-aware automation and intelligent search Cloud Platforms & Infrastructure • Microsoft Azure • Amazon Web Services (AWS) • Google Cloud Platform (GCP) • CI/CD pipelines • Containerized deployments • Cloud security and monitoring Automation & Integration Tools • n8n • Zapier • Microsoft Power Automate • API integrations and system orchestration Databases & Data Storage • SQL Server • MongoDB • Relational and NoSQL database architecture • Performance optimization and data integrity Additional Languages & Tools • JavaScript, TypeScript, Tailwind CSS • Python (for AI, automation, and integrations) --- What I Deliver • End-to-end Web, Mobile, and Desktop Applications • Full Stack .NET Solutions with clean architecture • AI-powered platforms, agents, and chatbots • Cloud-native, scalable applications • Secure APIs and third-party integrations • Database-driven systems built for performance and scale --- I offer free consultation for custom application ideas and enjoy working with founders and teams to refine requirements, design architecture, and turn ideas into production-ready systems. I stand behind my work. If you are not satisfied, I provide a complete money-back guarantee with no questions asked. I am a problem solver and a doer. If you need someone who can take full ownership of your application and deliver results, let’s connect and discuss how to make it happen.

Senior Full-Stack Developer | .NET + React Specialist Built full-stack web applications for healthcare, fintech, and SaaS clients. Work with teams that need someone who can handle both architecture and hands-on coding without constant hand-holding. Recent Projects: Healthcare clinic management system — Patient scheduling, EHR integration, HIPAA-compliant messaging. PostgreSQL + .NET Core backend, React frontend. 3 clinics live, handling 200+ appointments/day. Fintech payment platform — Multi-currency transactions, Stripe integration, automated reconciliation. Handles $50K+ daily volume. Built with .NET microservices + Next.js. SaaS marketplace — Multi-tenant architecture, role-based access, usage-based billing. MongoDB + .NET backend, React frontend. 2,000+ active users. What I Build: Full-stack applications where backend and frontend actually work together. API design, database architecture, user authentication, payment integrations, third-party APIs, deployment pipelines. Not interested in small fixes or WordPress tweaks. Best fit for projects $5K+ that need 2-6 months of focused work. Tech Stack: Backend: .NET Core, C#, ASP.NET, Node.js, Entity Framework Frontend: React, Next.js, TypeScript, Angular Databases: SQL Server, PostgreSQL, MongoDB Cloud: Azure, AWS (deployment, CI/CD, monitoring) Integrations: Stripe, Twilio, QuickBooks, SendGrid, Google APIs Domains with Real Experience: Healthcare: HIPAA compliance, patient portals, appointment systems, EHR integrations Fintech: Payment processing, PCI compliance, transaction reconciliation SaaS: Multi-tenancy, subscription billing, role-based access E-commerce: Inventory management, order processing, shipping integrations How I Work: Available 30+ hours/week. Overlap with US timezones (EST/PST). Daily updates via Slack/email. Code reviews before merging. No surprises mid-project. Work through Step2gen Technologies (70+ developer team, India-based). You get me as your dedicated developer plus backup support if needed. Looking for: Projects $5K-$50K range 2-6 month duration Clear requirements or willingness to define them together Clients who value getting it done right over getting it done cheap If you need someone to start this week and actually finish what they start, let's talk.

Lead .NET Mobile & Backend Engineer with 19+ years of experience designing and developing production-grade systems. 🔹 What I Do Best: Web/Backend: C#, ASP.NET Core, REST APIs, SignalR, SQL Server Mobile: C#, .NET MAUI, Native Kotlin, Swift End-to-End Delivery – from idea or sketch to fully published app Architecture & Scalability – clean, maintainable, and testable codebases 🔹 Why Clients Choose Me: 19+ years of experience in the .NET ecosystem (desktop, backend, and mobile) Strong backend expertise: ASP.NET / .NET Core APIs, SignalR, SQL Server, scalable architecture Deep knowledge of iOS & Android platforms (native and cross-platform) Strong track record on Upwork since 2010, with long-term client relationships Ability to take projects from concept → prototype → MVP → feature-rich, production-ready release

🚀 10+ Years | 12,000+ Hours | Mobile App Expert (Android • iOS • React Native • Flutter) I help startups, enterprises, and entrepreneurs turn ideas into high-performing mobile apps that users love. With 8+ years of experience and 12,000+ development hours, I’ve built 100+ apps across industries — FinTech, Telemedicine, E-commerce, Social Media, Logistics, and more. My focus: Apps that are fast, secure, scalable — and delivered on time. 💡 What I Deliver: :- Native & Cross-platform Apps – Android (Java/Kotlin), iOS (Swift/Objective-C), React Native, Flutter :- End-to-End Development – from UI/UX to backend (API, AWS, security) :- Third-party Integrations – Facebook, PayPal, Google Maps, In-App Purchase, Plaid, Dwolla :- Special Features – Sensor-based apps (Accelerometer, Gyroscope), mobile games, HIPAA-compliant healthcare apps :- Performance Optimization – Fast load times, smooth animations, low battery usage 🛠 Why Clients Hire Me: ✅ Proven track record – 12,000+ hours, 100+ apps launched successfully ✅ Clear communication – Regular updates, no guesswork ✅ Quality & Deadlines – 100% commitment to both ✅ 24/7 Availability – I work in your timezone when needed Whether you need a brand-new app or improvements to an existing one, I’ll bring technical expertise, creative problem-solving, and business understanding to make your project succeed. 📩 Let’s build your next successful app together.

🏆 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.

I help startups and enterprises ship production-ready software - fast, clean, and built to scale. Over 9+ years, I've delivered 50+ projects across healthcare, logistics, real estate, and gaming, from greenfield builds to complex migrations and performance rescues. Clients hire me when they need a senior engineer who can own the full stack, make sound architecture decisions, and communicate clearly without hand-holding. How I Work: - Architecture-first: Clean boundaries, SOLID principles, DDD/CQRS, where it adds value - Quality by default: Automated tests, code reviews, documentation that actually helps - Performance-minded: Profiling, caching, async patterns, cost-aware cloud design - Transparent communication: Frequent demos, clear milestones, no surprises Tech Stack: - Frontend: React, Next.js, Angular, Blazor, Tailwind - Backend: ASP .NET Core, ElysiaJS, Node.js, FastAPI - Languages: C#, C++, TypeScript, Python, Kotlin, PHP - Databases: PostgreSQL, MS SQL, MongoDB, Redis, DynamoDB - Cloud: AWS, Azure, Docker, Kubernetes, GitHub Actions - Real-time: SignalR, WebSockets, gRPC, RabbitMQ

Zazen Technologies specializes in developing highly sophisticated Mobile applications and Websites for Entrepreneurs and Small to Mid size companies. Our offices are in San Francisco and Denver! We also work with Angel Investors and VCs, along with offering our clients mentoring on how to develop and support a Technology Startup!! We have extensive experience with: Native iOS & Android app development Backend Development & architecture Crypto Currencies NFTs Blockchain Responsive web design & development Cross-platform development using frameworks like Phonegap and Xamarin eCommerce / FinTech Food Delivery Service Delivery Dating and Event Planning Social Media Health and Fitness Product design involves a UI/ UX designer laying out all the screens required for the platform with wireframes. Once those wireframes’ flows are approved, the app’s screens are designed, in part by taking the visual identity established in Platform Branding and using it as a jumping off point to establish the app’s look and feel. High-fidelity mocks are passed from our designers to engineers who code these frontend screens into existence. At the same time, backend engineers are building the behind-the-scenes pipes and engines that make your platform tick and operate effectively. Testing is heavily integrated into our Product Development process. We test the stability of the code as well as its ability to scale with platform growth. Testing is also incorporated to account for various phone devices and environments. Support and maintenance help is also available for clients once products are released. Clients owned 100% of the code once the product is completed. Read more about our engineering process iOS App Development Our rich technical expertise across different industry verticals helps you develop business-centric iOS apps that match your vision and engage your end-users. Our iOS application team is also specialized with the latest and most intuitive language SwiftUI to create interactive and scalable apps across all Apple devices (iPhone, iPad, macOS, WearableOS & others). Android App Development Unlock the potential of your business with our best-in-class Android app development services and advanced solutions. We are an award-winning mobile app development company that helps thriving enterprises bridge the gap between ideas and reality through custom and cloud-ready mobility solutions.At Zazen Technologies, we develop distinctive mobile apps that ensure a smooth and user-friendly interface for the end-users.

If the problem involves AI touching real decisions—and getting it right matters—I’m usually a good fit. I routinely deliver what would take most teams a week in a single day. As one former Upwork client put it: “Got a week’s worth of work done in less than an hour due to Jonathan’s expertise. Would work with him again, no question.” That speed comes from deep domain expertise and fluency with modern AI tooling, which I use as a force multiplier—not a shortcut. I move quickly because I know exactly what to build, what not to build, and how to avoid rework through systematic testing. Most of my work sits in environments where systems influence money, risk, or operations, and where errors are expensive. The goal is not experimentation or novelty. It is building systems that work the first time, explain their decisions, and remain reliable under scrutiny. I led the design and implementation of an AI-driven small-business credit platform for a publicly traded lender (~$40M+ annual revenue). The system automated the majority of application decisions by combining structured financial data, document understanding, and retrieval-augmented analysis with tool-enabled research. Within a controlled environment, the system could query internal data, perform constrained external searches, and assemble a 30-point underwriting profile aligned with senior credit-analyst reasoning. Crucially, the system enforced confidence thresholds and escalation logic. Only the most complex 10–15% of applications were routed to expert underwriters, allowing human effort to concentrate where judgment actually added value. Manual review fell sharply without increasing risk. Security was treated as a first-order constraint. All PII was isolated within private network boundaries, with encrypted storage and tightly scoped access. Even large-language-model interactions—including external research—were routed through secured infrastructure so sensitive data never left controlled environments. Most engagements begin with a short diagnostic phase. I’m direct about whether I’m needed at all—and when I’m not, I say so. Clients often use a less expensive developer for execution once the critical architectural and risk decisions are made. That discipline is part of the job. Selected Systems I’ve Built At Finally, a $100M Series-B payroll company, I designed and shipped a production payroll platform in roughly six weeks, making early architectural decisions that prevented later rewrites and operational debt. In academic publishing, I helped build and stabilize Refine.ink, an AI-driven peer-review platform used by faculty at leading U.S. universities, where rigor, explainability, and predictable behavior were non-negotiable. As Refine.ink’s co-founder put it: “Jonathan combines deep technical ability with unusually strong judgment. He consistently identified the right problems to solve and built systems we could trust in production.” — Ben Golub, Co-Founder, Refine.ink; former Professor of Economics and Computer Science at Harvard; current Professor of Economics at Northwestern University I’ve also built agentic and multimodal systems that execute real workflows: voice-driven legal intake systems that conduct structured interviews and route qualified matters directly into case management; and computer-vision pipelines where I fine-tuned custom object-detection models to classify industrial weld defects—often only a few pixels wide—achieving ~95% accuracy with a lightweight human-review loop. I’m typically brought in when teams need rapid progress without mistakes—when systems have to move fast and still hold up in production. I work quickly because I’m an expert at what I do and deeply fluent in AI tooling, which allows me to compress timelines without cutting corners.

Senior .net developer 10+ years of experience As the CEO of Bits Orchestra and an experienced asp.net core developer, I lead a top-tier software agency specializing in building cutting-edge web application & mobile application. With over 10 years in the industry, I bring a deep understanding of both technology and business. As a C# .NET Developer and Software Engineer - Angular & C#, I deliver high-quality, scalable solutions. My five-year tenure as a global software development consultant for Shaw Industries Group Inc. in Massachusetts sharpened my communication skills and technical expertise, ensuring seamless project delivery and client satisfaction. 🌟 Our Expertise We offer a comprehensive range of services to help your business succeed: ✔️Custom Software Development From full stack developer to specialized .NET solution, I create scalable and robust software tailored to your needs | ASP.NET development ✔️Kentico Xperience As an expert Kentico Developer, I deliver seamless CMS solutions for optimal content management and enhanced user experiences. ✔️UI/UX Design I design intuitive, user-friendly interfaces to boost customer engagement and satisfaction, ensuring your app or website stands out. ✔️QA, Testing, and Maintenance We provide thorough QA, rigorous testing, and ongoing maintenance to ensure your software is reliable and high-performing. ⚙️ Technologies We Use We work with the latest and most powerful technologies to deliver top-notch solutions: Front-End Software Development We create intuitive and efficient interfaces for web and mobile applications, ensuring high performance and user interaction. We use modern technologies to develop scalable and fast solutions that meet business requirements: React | React .NET | React Native | React TypeScript | Angular | Vue.js | .NET VueJS | Next.js Back-End Development | Senior Backend .NET Developer We develop reliable and scalable server-side solutions that ensure stable application performance and efficient data processing Microsoft .NET | .NET Core | ASP .NET | NodeJS | Nest JS | .NET API | .NET Backend Developer | .NET Core Angular | .NET Webform | .NET Developer | C# .NET Developer | C# | Java Developer | .NET Fullstack | .NET Full Stack Developer | .NET Development | .NET React | ASP.NET Core Developer | ASP.NET Developer | ASP .NET Developer | ASP NET Cloud Platforms | Microsoft Azure services We use leading cloud platforms to ensure scalability, reliability, and security of your applications. With solutions like Azure, AWS, and Firebase, we provide efficient infrastructure, process automation, and flexibility in deploying cloud-based solutions. Azure | AWS | Jenkins | Firebase | Azure Functions | Azure Serverless Mobile App Development We specialize in developing cross-platform mobile applications that deliver seamless user experiences on both iOS and Android. Using technologies like Flutter and React Native, we create efficient, high-performance mobile apps tailored to meet your business needs. Flutter | Flutter Developer | Mobile App Development | iOS Developer | React Native 🔧 Additional Skills and Expertise Full-Stack Developer C# .NET Developer Java Developer .NET Fullstack Developer Power Apps Developer ASP.NET Core Developer Senior .NET Developer Web Developer Kentico Developer .NET Development .NET Webform React Native Mobile App Development Travis .NET VueJS Product Manager Front End Developer Integration Consultant Syncfusion Full Stack Node.js React Typescript Java Developer Backend Developer Power Apps Developer Github CI/CD ⚡ What Sets Us Apart At Bits Orchestra, we ensure that each project is done right from the start with requirements analysis and post-project support. We aim to build long-term relationships with our clients, ensuring their projects evolve as their business grows. 💬 Get in Touch I’m always happy to help! If you’re looking for a free consultation or need assistance with your next software project, don’t hesitate to contact me. Let’s innovate together and drive your business forward!

Are you looking for Mobile Application for your business's exponential growth? Hard to Find Good Developers? Failed to Solve Any Real-World Problem? Not Sure about the Mobile Apps Platform? Don't Have Enough Marketing Time? Hi, I'm Zia Ahmed an Expert Mobile App Developer. I have developed 200+ apps for all sorts of industries healthcare to entertainment. I help to develop mobile apps with the right tools and skills. All You Need Is: ✅ Professional Work ✅ 100% Working App ✅ 24/7 Availability ✅ Support Even After Work Completion ✅ Money back guarantee if you aren’t happy ✅ End-to-End Testing of Code ✅ Refactored Code ✅ 100% Bug-Free Code My Skills Are: ✅ React Native ✅ Xamarin ✅ Flutter ✅ Swift & Objective-C (iOS) ✅ Java & Kotlin (Android) ✅ UX/UI Desgin (Adobe XD | Figma) My Services Include: ✅ Modern UI Design ✅ API Integration ✅ In-App Purchases ✅ Real-time Database ✅ Google Maps Integration ✅ Location ✅ Custom Views ✅ Social Media Integration ✅ Web-services ✅ Material Designs ✅ Ads Integration ✅ Camera’s SDK ✅ Audio & Video Calling ✅ Custom Widgets ✅ Logo for your Application ✅ Responsive application ✅ Neumorphic Design ✅ Dark & Light Themes Example of My Workflow: ✅ Research — I start working by analyzing both your business and your clients and then determine goals and strategies based on that research. ✅ Development — Wrap your idea into an attractive design language. That's the phase where well-known UI/UX design is converted to a mobile application. You'll get your app design converted to an app. All screens, all transitions, all pop-ups, from prototypes to reality. ✅ Testing — After the Development application will be tested and the development phase will be repeated until your satisfaction then moves to the next phase. ✅ Production — Application will be delivered/deployed. ✅ Support — Will not leave you halfway. You can rely on my development support for your project in the future. 🔴 Reach Me Right Now for Free Consultation 🔴 Thank You! -Zia Ahmed