Full stack developer (.NET, React) 100% remote within Spain

We are looking for a Senior full stack developer with deep expertise in .NET, React, Azure Cloud, and Artificial Intelligence technologies.

The ideal candidate will be responsible for designing, developing, and delivering scalable cloud-native applications while driving the adoption of AI-powered solutions across the software development lifecycle.

This role requires a hands-on senior who can work across front-end, back-end, cloud infrastructure, and AI services to build innovative digital products. You will collaborate closely with architects, product owners, data scientists, and cross-functional engineering teams to deliver secure, scalable, and intelligent applications.

Main Tasks And Accountabilities Will Be

Software Development Design, develop, and maintain enterprise-grade web applications using: .NET 8 / C# ASP.NET Core React.js and TypeScript RESTful APIs and Microservices

Develop highly scalable and maintainable cloud-native solutions.

Implement modern software engineering practices including Clean Architecture, Domain-Driven Design (DDD), and SOLID principles, Azure DevOps GitHub Actions

Participate in architecture discussions and technology decisions.

Improve code quality through: Automated testing Security scanning Static code analysis Code reviews

Work closely with Product Owners and Business Stakeholders to translate business requirements into technical solutions.

Lead technical workshops, design reviews, and proof-of-concepts.

Drive innovation and continuous improvement initiatives.

Provide technical leadership and guidance across development teams.

Backend: 7+ years of software development experience.

Strong expertise in: C# .NET Core / .NET 8, ASP.NET Core, Entity Framework Core, React.js, TypeScript, JavaScript, ES6+ , HTML5, CSS3, Material UI or similar frameworks

Extensive Experience With Microsoft Azure.

CI/CD pipelines

AI & Data

English B2+/C1, * NET, C#, Code Review, Azure DevOps, Domain-Driven Design, Microsoft Azure, TypeScript, Test Automation

`Retribución Flexible´ Program: (Meals, Kinder Garden, Transport, online English lessons, Health Care Plan…)

Free access to several training platforms

Professional stability and career plans

UST also, compensates referrals from which you could benefit when you refer professionals.

The option to pick between 12 or 14 payments along the year.

Real Work Life Balance measures (flexibility, WFH or remote work policy, compacted hours during summertime…)

UST Club Platform discounts and gym Access discounts

More in details, UST is a multinational company based in North America, certified as a Top Employer and Great Place to Work company with over 35.000 employees all over the world and presence in more than 35 countries. We are leaders on digital technology services, and we provide large-scale technologic solutions to big companies., provider of digital technology and transformation, information technology and services