Felix Díez Arias

Senior Software Engineer

Open to senior / staff engineering roles · remote-first, EU time zones

Summary

A Senior Software Engineer with a decade in the .NET ecosystem. My work splits in half — setting technical direction (modernization strategy, architecture, leading a team) and staying hands-on in the code. I fold AI tooling into the workflow to move faster, without letting the fundamentals atrophy.

Experience

Senior Software Engineer · Tunstall Healthcare

Aug 2022 — Present

United Kingdom · Remote

Web application development across the .NET ecosystem on connected-care systems — a blend of legacy and modern apps, with a strong pull toward modernization and innovation.

Leading the portfolio-wide migration to .NET 10
Family App concept (React Native + microservices) voted #1 in the PI innovation sprint — now leading a 9-person team

.NET · Blazor · React · Docker · RabbitMQ · Azure

Software Developer · Minsait (Indra)

Jun 2018 — Aug 2022

Madrid, Spain

Built web applications for contract management, progress control and billing — from requirements gathering with the client through design, development and final validation.

Owned technical design and CI/CD pipelines on Azure DevOps
DDD, CQRS & MediatR on .NET, with Angular on the front

.NET · Angular · Entity Framework · Dapper · Azure DevOps · CQRS

Junior Consultant · everis (NTT Data)

Nov 2016 — Jun 2018

Madrid, Spain

First steps as a professional engineer — custom applications for real-estate and construction clients, growing from a Salesforce CRM internship into full-stack .NET delivery.

Technical design, unit testing and quality control on delivery
Started on Salesforce (APEX / Lightning), grew into .NET + Angular

.NET Core · Angular · SQL Server · Salesforce

Selected projects

Aura

2026–Present

A personal agentic assistant platform — one core, many channels.

.NET 10 · Blazor · Hexagonal Arch · OpenAI · SQLite

felixdiez.es

2026

The site you're reading — built to be edited from my phone.

Astro · TypeScript · Content Collections · RSS

Skills

Languages & platforms. C# / .NET — Framework → .NET 10, TypeScript, SQL
Web & mobile. Blazor, React, React Native, Angular
Architecture. Microservices, Domain-Driven Design, CQRS / MediatR, Event-driven (RabbitMQ), Caching (Redis)
Data. SQL Server, Entity Framework, Dapper
Cloud & delivery. Azure, Docker, Azure DevOps, CI/CD, Testing & quality
AI-augmented engineering. Claude Code & agentic workflows, LLM-assisted delivery, MCP

Languages

Spanish — Native
English — Professional working proficiency