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David R.
@davidd545
Principal NET Developer for Legacy Modernization and Business Systems
Stati Uniti
Chi sono
I am not a bot. That *is* me in the photo with an AI background. I have been coding for over 20 years for Fortune 100 companies. You've probably bumped up against something I've worked on.
On Fiverr I focus on modernization and desktop-to-web conversion. I build, refactor, and extend production software across .NET, web, desktop, backend, automation, and workflow platforms. I specialize in modernizing aging systems, preserving business logic, fixing hard problems, and delivering practical, maintainable solutions. Strong in C#, ASP.NET Core, Angular, Blazor, WinForms, WPF, APIs and Queues.
Competenze
David R.
offline •
Consulta i miei servizi
Applicazioni web full stack
I will modernize, fix, or extend your legacy dotnet application
Shopify
I will build a website with a payment system
Esperienza lavorativa
Principal Software Engineer
FIS • Freelance
Apr 2007 - Apr 2026 • 19 yrs
I am a real programmer. Not AI. I don't need AI to do my work. I am a master full stack dev. I can build literally anything you need. Fiverr doesn't have the names of most of the companies I have worked with. Most are fortune 8-100. This is not all related to FIS. I have included everything under a single company for simplicity. Full CV available upon request. 1. Overhauled numerous legacy systems and solved decades-old issues that many previous programmers had failed to resolve. 2. Distributed applications across multiple workers using NServiceBus to improve scalability and throughput. 3. Supported systems processing millions of transactions daily, and modernized scalability far beyond that. 4. Reduced operational costs by 90% through scaling and efficiency improvements. 5. Modernized applications from AngularJS to Angular 8-11. 6. Documented highly complex systems. 7. Built ASP.NET REST APIs from scratch for MAUI and React Native mobile applications. 8. Architected and built various Message Queues including NServiceBus (early adopter), MSMQ, RabitMQ and Azure Storage Queue pipeline using Azure WebJobs. 9. Implemented Google Vision API services for image recognition and data extraction. 10. Refactored large C# auto-documentation suite into SaaS, helping land a major enterprise clients. 11. Built an inventory management website for a company managing the world’s third largest inventory system. 12. Built oil and gas pipeline tools. 13. Architected and built an enterprise workflow system coordinating hundreds of back-office and mainframe-driven processes. 14. Modernized print and credit card manufacturing workflows. 15. More...
