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We help enterprises modernize, migrate, and future-proof IBM i (AS400), Mainframe, COBOL, and RPG environments while integrating them with cloud-native, API-first, and AI-enabled architectures. We are also ISO 42001 and ISO 27001 certified, ensuring strong AI governance and information security standards. Since 2013, we have delivered transformation programs for 100+ global clients, including Fortune 500 organizations—turning rigid legacy platforms into scalable, digital ecosystems. With deep expertise across IBM i, ERP, EDI, cloud, and enterprise application stacks, we bridge traditional systems with modern Java, .NET, cloud, microservices, AI, and real-time integration frameworks. Legacy Systems & IBM i / Mainframe Modernization Platforms: IBM i (AS400 / iSeries), IBM z, COBOL, RPG, SQLRPGLE, CLLE, Synon, NetCOBOL, Fujitsu COBOL, Delphi Operating Systems: OS/400 (V5R3–V7R5), IBM AIX Tools: Profound, LANSA, Synon, WebSphere, ARCAD, X‑Analysis, MIMIX, RDi, ACS Core Modernization Services AS400 / IBM i modernization & green‑screen transformation RPG to Java and .NET migration COBOL to NetCOBOL / Fujitsu COBOL conversion IBM i API enablement & microservices architecture DB2/400 migration to PostgreSQL, SQL Server, Cloud databases IBM i cloud migration (AWS & Azure hybrid models) Legacy application refactoring & performance optimization Full‑Stack Development (Java | .NET | PHP | Delphi) Java: Spring/Spring Boot, Hibernate, Struts, Microservices, REST/SOAP, Kafka, Camel .NET: .NET Core/5–7, ASP.NET Core, MVC, Web API, Blazor, WCF, SignalR, EF Core, WPF, WinForms PHP & Delphi: Laravel, Symfony, CodeIgniter, Yii, Zend | Delphi 7–11, RAD Studio, VCL, FireMonkey Frontend: React, Angular, Vue, Next, Bootstrap ERP, Integration & Streaming ERP: JobBOSS ERP (Manufacturing), JD Edwards (CNC, BSSV, Z‑Tables, UBE), Infor (XA, LX), PrismERP, S2K, CAMS/400, Dynamics AX Integration: MuleSoft (API‑led, DataWeave, RAML), Apache Kafka, REST/SOAP, cloud & hybrid integration EDI & B2B Integration X12, EDIFACT, VDA, TRADACOMS • Transactions 850–945 • VANs: OpenText, Liaison, GHX • FTP/SFTP/AS2 IBM Sterling, SPS Commerce, TrueCommerce • End‑to‑end EDI onboarding & automation AI, Cloud & DevOps AI: Code analysis, automated refactoring & tests, smart documentation, intelligent EDI validation Cloud & DevOps: AWS, Azure, GCP • CI/CD, Docker, Kubernetes, Jenkins, GitHub Actions Databases: DB2/400, PostgreSQL, MySQL, SQL Server, Oracle, MongoDB, Redis Why Choose Us? Proven IBM i / IBM z modernization expertise Kafka & MuleSoft real-time integration Deep EDI & ERP (Infor, JDE) capability Structured, outcome-driven transformation AI‑assisted acceleration for faster transformation Performance Assurance Dedicated 40+ hrs/week resource Direct Upwork communication Daily updates, weekly reports On-time, high-quality delivery Let's connect - If you are planning AS400 modernization, RPG conversion, COBOL migration, ERP integration, EDI automation, or AI-enabled transformation, we help you execute with precision and measurable outcomes. Keywords- IBM i Modernization | AS400 Modernization | RPG to Java Conversion | RPG to .NET Migration | Free Format RPG | Green Screen Modernization | IBM i Web Enablement | Legacy System Modernization | IBM i GUI Modernization | IBM i Cloud Migration | DB2 Migration | IBM i Consultant | Infor ERP Integration | JD Edwards EnterpriseOne | JDE API Integration | JDE Cloud Migration | ERP Integration | EDI 850 810 856 | WMS Integration | Cobol to Netcobol | Fujitsu Cobol | Delphi Modernization | Mainframe Migration | AI-Assisted Development | DevOps for IBM i | Enterprise Application Modernization | COBOL Migration | Mainframe Modernization | Job BOSS | AI‑Assisted Modernization | ISO27001 | ISO42001

A skilled software developer, on various platforms ranging from Windows to Linux to ARM and other embedded devices (AVR, PIC, etc). My preferred programming languages include, but are not limited to: - C/C++ - Java - Python - Rust - C# - Matlab I'm familiar with various open source libraries in different programming languages such as STL, Curl, Json, GTK, Swing, BeautifulSoup, Requests, Selenium, Tkinter, and many more... I've experience in Embedded Software using various microcontrollers (AVR, PIC, STM32, TM4C123, etc...). I've used many peripherals such as (GPIO, Timer, PWM, NVIC, RCC, FPEC, UART, SPI, I2C, CAN, ADC,...), interfaced it with many sensors and actuators. I've built many projects ranging from simple projects (blinking LEDs, motor control, calculator, stop watch, ...) to more advanced projects (Bootloader, Smart Home, Digital Clock, ...). I have a strong background about Algorithms and Data Structures such as: - Dynamic Programming - Backtracking - Graphs - DFS - BFS - MST - Heap - Trie - Balanced BSTs - Segment Trees - Disjoint Set - and many more... I've solved +370 DSA problems on HackerRank platform and got ranked 660 over 23 million developers in solving coding challenges. You can find my profile in the portfolio. My primary focus in writing software is performance, without sacrificing the safety and security of the application. I will do my best to discuss all the relevant details and the scope of the project with the client, so that I can form an idea of the finished product in order to be able to lay a better groundwork design for the project.

Senior .NET developer with 25+ years of hands-on experience working on real production systems. I help companies stabilize, modernize, and extend desktop and legacy .NET applications, taking ownership of existing codebases and delivering clean, maintainable solutions that work reliably long-term. Most of my work involves improving existing Windows desktop applications rather than building throwaway prototypes. I regularly take over mature or poorly documented systems, identify structural and stability issues, and extend functionality without disrupting production workflows. Clients usually come to me when a system is business-critical and needs careful, senior-level handling. My core expertise is in Windows desktop development using C#, WPF, WinForms, and the .NET Framework. I also have extensive experience supporting and modernizing legacy systems built with VB.NET, VBA, C++, and Delphi, including Office automation, custom installers, file system integration, and data-processing tools. For modernization and supporting services, I work with .NET Core, ASP.NET, Razor Pages, and REST APIs, which allows me to evolve legacy desktop systems, build internal web tools, or deliver complete end-to-end solutions when needed. I follow proven architectural practices such as MVVM, layered design, version control with Git, and predictable deployment processes. I’ve completed 120+ projects and 37,000+ hours on Upwork, working primarily on long-term and technically demanding systems where reliability, clarity, and ownership matter more than quick fixes. If you’re looking for a dependable senior .NET developer who can take responsibility for an existing system or build a stable desktop application from scratch, I’d be happy to discuss your project.

• 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.

I’m a Senior .NET Developer with 15+ years of experience building scalable APIs, BI dashboards, and enterprise web apps using ASP.NET Core, Angular, and SQL Server. I specialize in delivering clean, maintainable code that solves real business problems.