Daniel D.

Expert .Net Backend Developer

Top Rated Full-Stack Engineer (.NET / Angular / React) — 10+ years, microservices, legacy rescue, AI-augmented delivery I’m Daniel, a Top Rated Upwork developer (100% Job Success) with a decade building enterprise systems for U.S. and UK clients and a Computer Science degree. I specialize in the parts most freelancers avoid: brownfield .NET codebases, microservices at scale, and shipping fast under legacy constraints. What I do best: Backend (.NET / C#) - ASP.NET Core 6–8, .NET Framework 4.7, WebForms, VB.NET, REST APIs, CQRS, MassTransit, Entity Framework Core, RabbitMQ, AWS (SQS/SNS/S3/Lambda), Azure (Service Bus, Storage Queues, Blob) Databases - SQL Server, MySQL, PostgreSQL Architecture - microservices (20+ services at handoff in my last enterprise role), event-driven systems, Docker, JWT auth Recent Upwork wins: 5.0★ legacy rescue, U.S. logistics client (229 hrs, $4.8K) — sole .NET developer on a WinForms VB.NET / MySQL app for ships, containers, parts, sales. Shipped features end-to-end and fixed bugs other devs had bounced off. Built AI coding agents into my workflow and tuned them for legacy VB.NET — throughput went from ~1 feature/day to 3+/day; refactors that used to take a day dropped to ~1 hour. 5.0★ microservice update — delivered on a fixed-price microservice + Angular update with the reviewer calling me “an absolute wizard.” Ongoing solo build (UK client) — full-stack PowerPoint-generation microservices app: React 18 frontend, .NET 6 API (C#, EF Core, PostgreSQL, Docker, JWT). I run it end-to-end. What makes me different Most engineers treat legacy code as something to escape. I treat it as the job. I’m also an AI-assisted developer. I work daily with Pi Coding Harness and Claude Code and have built custom extensions to make LLMs work better with legacy databases. Languages: Portuguese (native), English (C2), Spanish (fluent). Let’s talk about what you’re trying to ship.