Hire the Best Windows Mobile Developers

• Also known as Windows and macOS App Developer Expert • 5+ years of experience • I work on backend, frontend, databases, and Linux server administration • Main stack: .NET (C# / Visual Basic) and TypeScript / JavaScript • I build web and multi-platform desktop/mobile applications 📚 Technologies • My main tech stack is .NET (C# or Visual Basic .NET) and TypeScript / JavaScript • For .NET, I work with ASP .NET, Blazor, WPF, Windows Forms, MAUI (formerly Xamarin), Avalonia UI, and more • For TypeScript / JavaScript, I prefer React, but I can also work with Angular, jQuery, or vanilla JS • I can also develop macOS and iOS apps using Swift and Objective-C 🗼 Server Administration and DevOps • Familiar with Debian-based Linux distributions like Ubuntu • Able to handle VPS baremetal or Docker-based setups • Able to automate workflows using Bash, Python, GitHub Actions, and similar tools • Experienced with cloud services such as AWS and Azure 📊 Database • Microsoft SQL Server • MySQL / MariaDB • SQLite • PostgreSQL • Microsoft Access 💡 Skills • Strong in algorithm design and analysis • Great ability to solve programming and system trouble • Great at optimizing software performance • Flexible work style • Adaptive team player 📖 Self-Update • I regularly study new technologies to stay up to date. 🕰️ Flexible Availability • Open to collaborate across multiple time zones (US, CA, UK, EU, APAC, etc.) ✅ I’m not a robot. • I’m a real human and a solo freelancer, not an agency 🙌 Let’s Connect! • My name is Junian and I’d love to help bring your ideas to life • Feel free to reach out so we can discuss how I can support your project • Not a Vibe Coder, but use AI-Assisted Programming tools to solve problems • Linus Torvalds once said, “Talk is cheap. Show me the code.” So go ahead and check out my GitHub code. 🛠️ Common Tasks and Roles • Known as the Apple / macOS / iPhone guy • Build Windows app with .NET Framework & Windows Forms (WinForms) / Windows Presentation Foundation (WPF) / WinUI / Avalonia UI / MAUI / Xamarin • Build Windows Installer MSI / EXE from existing Windows App by using Wix / WixSharp • Build macOS app with Swift UI or .NET & Avalonia UI / MAUI / Xamarin • Build, sign, and notarize macOS app installer (PKG / DMG / ZIP) • Build web app with ASP .NET & Blazor / React / Angular / Vanilla JavaScript • Deploy and configure existing web apps by using Docker container to VPS / Cloud providers like AWS, Azure, or GCP • Ethical decompile / reverse engineer / source code retrieval / deobfuscation of existing .NET EXE / DLL / MSI or NinjaTrader Trading Indicator / strategy • Automate Windows UI tasks • Web scraping to retrieve online data / PDF / Images / any other files • Expert macOS system and app troubleshooting 🙋‍♂️ What I'm not • I'm not a Vibe Coder. Don't get me wrong, I use AI to build software, but I don't solely rely on it.

If your business has outgrown packaged software, I build what fits — custom, end-to-end solutions designed around your exact processes. Since 2006, I've delivered bespoke software across 8+ countries for clients ranging from global enterprises to funded startups. I currently maintain active support contracts with Vodafone and Philip Morris International, and have built and shipped products in logistics, fintech, agriculture, manufacturing, real estate, maritime, and SaaS. What I bring that most developers don't: — I've sat inside IT departments of large corporations, so I understand how decisions are actually made and what "production-ready" really means. — I've founded multiple software ventures of my own, so I understand the pressure of building something that has to work from day one. — I work across the full stack: mobile (Expo / React Native), web, desktop, backend APIs, cloud infrastructure (Azure, AWS), databases (MSSQL, Supabase, PostgreSQL), and third-party integrations (Stripe, open banking, ERP systems, barcode/IoT, and more). — I own physical iOS, Android, macOS, and Windows devices — every build is tested on real hardware. I work in structured weekly milestones with written updates, clear communication, and no surprises. My clients stay with me long-term because the work is done properly the first time. If you have a project that needs to be built right — not just built fast — I'd like to hear about it. Countries where I gained international experience: ● United States 🇺🇸 ● Australia 🇦🇺 ● Canada 🇨🇦 ● United Kingdom 🇬🇧 ● Chile 🇨🇱 ● China 🇭🇰 ● México 🇲🇽 ● Netherlands 🇳🇱 ● Turkey 🇹🇷 Development devices: - Dell XPS i7 16GB - Macbook Pro i7 32GB - Macbook Pro M1 16GB - Asus Thin Client Test PC - iPhone & iPad Devices - Android Devices - Zebra Barcode Scanner - DS2208 - Zebra Label Barcode Printer - ZD220 - Benq p50 Pocket PC Windows CE (Windows Mobile v5.0 and v6.5) Development Tool and Skills: ● C# / VB .NET / .NET Core / .NET Framework / Entity Framework / XAML / Blazor / LINQ / SQL / MVC / MVVVM / WinForms / WPF / UWP / Xamarin / MAUI / ASP.NET / WindowsCE Pocket PC / ZPL / XML / JSON / JS / AI / React Native / Expo / React ● Microsoft SQL Server / SQLite / PostgreSQL / MS Access / MS LocalDB ● Azure DevOps / AWS / Heroku / RESTful API / SOAP / Web Services / .NET Core Web API ● Docker / Postman / Git / TFS / SVN / GitHub / Jira / Trello / Microsoft Teams / Microsoft Dynamics / Visual Studio / Microsoft SQL Management Studio / Azure Data Studio / SAP ● DevExpress / Telerik / Syncfusion

I am an advanced software developer with 25 years of experience in various problem areas. I can work alone or with your team in agile development environment on any product development stages. My primary specialization is .NET Framework technology stack, Windows applications development and performance optimization. I also have working experience in C++ and Java development, good SQL and web technologies stack understandings.

I help individuals, startups, SMBs, and enterprises build reliable, scalable, and user-friendly .NET applications. With 12+ years of experience in custom software development, I specialize in transforming ideas into high-performing desktop, web, and mobile solutions that drive measurable business results. ➜ 𝐖𝐡𝐚𝐭 𝐈 𝐃𝐨 𝐟𝐨𝐫 𝐘𝐨𝐮 You’ll get more than just coding support — I ensure your software is: • Reliable & Scalable → Built on robust .NET architecture. • User-Friendly → Clean UI/UX for smooth adoption. • Future-Proof → Modern technologies and maintainable code. • On-Time → Agile approach with frequent updates and demos. ➜ 𝐌𝐲 𝐓𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 • Desktop Apps: WPF, WinUI 3, UWP • Mobile Apps: Xamarin, MAUI • Backend & Frameworks: .NET Core, .NET 5/6/8, .NET Framework (3.5+) • Architectures: MVVM, MVC, PRISM, Singleton, n-Tier, Dependency Injection • Databases: SQL Server, SQLite, MySQL, Oracle • Integrations: Google APIs, Social APIs (Facebook, Twitter, LinkedIn) • UI/Controls: DevExpress, SyncFusion, Telerik ➜ 𝐖𝐡𝐨 𝐈 𝐖𝐨𝐫𝐤 𝐖𝐢𝐭𝐡 • Startups looking to launch MVPs • SMEs modernizing legacy systems • Enterprises needing robust desktop, web, or mobile apps • B2B & B2C businesses seeking tailored software solutions ➜ 𝐌𝐲 𝐏𝐫𝐨𝐜𝐞𝐬𝐬 1. Understand your goals & requirements 2. Propose the most effective technical approach 3. Share similar past work & align expectations 4. Start with a pilot milestone (risk-free) 5. Provide regular updates, demos, and post-deployment support ➜ 𝐖𝐡𝐲 𝐂𝐥𝐢𝐞𝐧𝐭𝐬 𝐂𝐡𝐨𝐨𝐬𝐞 𝐌𝐞 • Top Rated Plus on Upwork with 100% Job Success Score • Client-Centric Approach: clear communication, flexible engagement • Confidentiality Assured: NDA & secure contracts • Proven Track Record: worked with startups and global enterprises • Easy Collaboration: available via Skype, Teams, Slack, Zoom I’m not just a developer—I’m a partner in your project’s success. My commitment to understanding your goals and providing ongoing support reflects my dedication to achieving the best outcomes for you. Let’s work together to create something extraordinary. Updating an existing app, or building something from the ground up — drop me a message, it is free to talk it over.

25+ years in Software Development Available for 40-60 hrs./wk. Excellent references from CEOs of the companies. Bringing products to market: inception, spec, architecture, implementation, testing. Seeking for software development projects in the following areas on Windows Platforms: - Recent successful GPT-3/3.5/4 API experience with C#, DALL-E interface, and OpenAI Whisper. - Experience of developing RAG Web Service enabling chatting with private corpus of documents, based on Azure Cognitive Search SDK, Azure OpenAI API and Azure Cosmos Vector DB for vector, hybrid, and semantic search. Segmenting Word/PDF/Excel/CSV/Text documents, embeddings, and ingestion. - Worked with ML.NET in VSTO Outlook Add-In environment for email classification. - Experience with Text-To-Speech and Speech-To-Text using AWS, Azure, Google, Eleven Labs, and other vendors. Experience with Google Voice Services, including Diarization (recognition of different speakers and designation in the transcript), and Medical Transcription. Able to produce STS (Speech-to-Speech) application - interacting with ChatGPT over microphone and speakers. Recent Development Experience of TTS with OpenAI. - AI Training of basic GPT models using fine-tuning, and embedding techniques with vector databases, such as Pinecone, Qdrant, and Milvus APIs. - OpenAI Completion and Embeddings API, GPT-3/3.5/4, Whisper API for Transcribing and Translation - Azure Semantic Kernel, Azure Data Explorer (ADX), Azure Blob Storage, Azure Analytical Services. - AWS Text-To-Speech, AWS Storage - Web Services: REST-API, ASP.NET Framework and Core, WCF Web Services, Microservices - Azure Active Directory Authentication from Desktop Applications in C# - Desktop applications with C#/.NET Framework/.NET Core, WinForms, WPF, DevExpress - Microsoft Office VSTO/COM Add-Ins for Outlook, Excel, Word, and PowerPoint - Client/Server Systems: Sockets and high-level protocols, such as HTTP, FTP, MQTT - Windows Services - Microsoft Dynamics 365 - Hardware Interface: USB/RS232/RS485 Technologies and Frameworks: - Languages: C#, C/C++, Python, MicroPython, XML, JSON - Databases: SQL, SQLite, MySQL, Entity Framework 6/Core and LINQ. - Networking: Sockets (.NET and Winsock), REST API, WCF, HTTP, FTP, MQTT, packet-level TCP/IP, - Serial (RS232/RS485), MODBUS. - IDE: Visual Studio 2010 through 2022 - Office Add-Ins: VSTO Add-ins for Outlook, Excel, Word, PowerPoint. Add-In Express Framework. - VOIP: PJ SIP Stack with DBUS, Asterisk, Open Phone Abstract Library (OPAL) - Active Directory/LDAP/ADSI - Monte Carlo Simulations in C# - Linux: C/C++ and Python with MQTT Development on Ubuntu and Raspbian. - AES256 Encryption, Monte-Carlo Simulations, SHA256, PGP/GnuPG PKI (Public Key Infrastructure) Application binaries signing (Authenticode), Security Certificate generation in code based on CA. - Installers with Advanced Installer, Deployment strategies. - Product Licensing

Hello, I’m Jason Nhien Truong, a Senior Software Engineer and Software Architect with over 20 years of professional experience delivering reliable, maintainable software solutions for businesses across multiple industries. I specialize in C# and .NET development, Windows desktop applications, enterprise web systems, SQL databases, and Azure-based platforms. I help clients modernize legacy systems, stabilize and scale existing products, and build new applications with a strong focus on performance, usability, and long-term maintainability. I work closely with stakeholders to translate business needs into practical, well-structured technical solutions. What I offer Full-stack .NET development I work across the .NET ecosystem, from legacy ASP.NET Web Forms to modern .NET 8 APIs and microservices. I design secure, scalable backend systems with clean architecture and clear separation of concerns. Windows desktop application development I have extensive experience building and maintaining Windows desktop applications using WinForms and WPF, including MVVM-based WPF applications. I focus on responsive UI behavior, clean data binding, maintainable ViewModel design, and user-friendly workflows for business-critical desktop software. Enterprise UI with DevExpress and Telerik I have deep expertise with DevExpress and Telerik controls for WinForms and web applications. I redesign and modernize complex UIs to improve usability, consistency, and performance without breaking existing business logic. Database architecture and optimization Strong experience with SQL Server, PostgreSQL, MySQL, and Azure SQL. I design schemas, optimize queries, and ensure data integrity and stability in production systems. Azure cloud and DevOps Hands-on experience deploying and maintaining applications on Azure, including CI/CD pipelines, containerized services, background processing, and cloud-based integrations. Testing and automation I write unit and integration tests using xUnit and NUnit, and implement automation with Selenium and AutoIt to improve quality and reduce regression risk. Key technical skills Languages and platforms C#, .NET Core, .NET 8, ASP.NET, SQL, JavaScript, HTML, CSS, Python Desktop development WinForms, WPF, MVVM, DevExpress WinForms, Telerik UI Frameworks and tools Entity Framework, LINQ, Docker, Azure DevOps Databases SQL Server, PostgreSQL, MySQL, MongoDB, Azure SQL Cloud and monitoring Azure, Kubernetes, Azure Service Bus, Prometheus, Grafana Architecture Microservices, Clean Architecture, Domain-Driven Design Selected projects Web forecasting application maintenance Maintained and enhanced a legacy ASP.NET Web Forms application using SQL Server 2022 and Telerik UI. Improved UI workflows, business logic, and performance. Betx – cloud-native microservices platform Developed backend microservices using .NET 8 and Web API. Worked on PostgreSQL data modeling, Azure Kubernetes deployment, secure APIs, messaging, and observability with Prometheus and Grafana. Custom ERP system for manufacturing Built a custom ERP system using C# and SQL Server, including workflows, reporting, role-based access, and third-party integrations. Carrier pricing API integration Integrated FedEx and UPS APIs for real-time pricing, data synchronization, and robust error handling with retries and logging. Why work with me I bring deep technical experience, strong ownership, and a business-focused mindset. I communicate clearly, meet commitments, and build software that remains stable and maintainable over time. Availability Open to full-time or part-time engagements. Flexible with time zones for long-term projects. If you’re looking for a senior .NET engineer who can handle both backend systems and Windows desktop applications with confidence, feel free to reach out.