Role DescriptionAs a Senior .NET Backend Developer, you will drive architectural decisions for our flagship product’s server-side platform. You will work closely with Frontend and UX/UI teams to design and deliver robust APIs, ensure scalability, and maintain high performance and reliability. Freelance or permanent.ResponsibilitiesDesign, develop, and maintain backend services and RESTful APIs using .NET CoreDrive backend architecture decisions (modularity, scalability, reliability, observability)Build reusable backend components, shared libraries, and utilities for future useTranslate product requirements into clean, maintainable, and well-tested codeOptimize services for performance, throughput, and low latency under high loadEnsure secure data handling, authentication/authorization, and best practicesImplement logging, metrics, and tracing using Azure-friendly observability toolingCollaborate with database and platform teams to design efficient data models and integrationsRequirements3+ years of experience in backend development1+years of experience with Claude Code and/or OpenCode50% remote, 50% in MadridStrong proficiency in C# and the .NET ecosystem (ASP.NET Core, DI, middleware)Solid understanding of API design, versioning, and documentation (OpenAPI/Swagger)Experience with data access patterns and libraries (e.g., Entity Framework Core, Dapper)Knowledge of SQL and/or NoSQL databases and performance tuningExperience with testing practices (unit/integration tests) and CI/CD workflowsEnvía tu CV a admin@ruideria.com

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Ingeniero Senior .NET (50% Remote)