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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Full-Stack Software Engineer - **Company:** Número De - **Location:** Barcelona, Spain (Remote available) - **Salary:** €75,000.0 - €85,000.0 - **Contract:** Permanent contract - **Skills:** JavaScript (Programming Language), Automation of Tests, Unit Testing, Microsoft Azure, Software as a Service, Microsoft SQL Server, Software Maintenance, Systems Integration, Test-Driven Development (TDD), Sql Optimization, Technical Debt, Front End Software Development, Service Stack, Web Api - **Published:** September 19, 2026 - **Apply:** https://www.adzuna.es/contact-us.html ## About the Role + 7+ years of full-stack software development experience, with strong expertise in C# and .NET/Core, ideally within SaaS products. + Strong experience with modern frontend JavaScript frameworks. + Strong hands-on experience developing and integrating Web APIs. + Advanced SQL skills, with SQL Server experience preferred. + Strong knowledge of Test-Driven Development and automated testing, including both unit and integration testing. + Hands-on experience with Azure Cloud. + Azure DevOps experience is a plus. + Strong ability to build intuitive, reliable, and maintainable software. + Ownership mindset with a track record of following through on commitments and taking responsibility for technical outcomes. + Comfortable working independently in a small-team environment while actively collaborating with others. + Curious and proactive approach to learning, experimentation, and adopting new technologies. + Willingness to ask questions, challenge assumptions, learn from mistakes, and continuously improve. + Strong attention to detail and a commitment to engineering excellence. + Self-driven approach with the ability to use sound judgment and seek alignment when needed. + Currently based and legally authorized to work within a European country in the CET, EET, or WET time zones. ## Description This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Full-Stack Software Engineer based in Spain. This is a fully remote opportunity for a senior engineer who can take ownership of complex software projects from concept through launch. You will contribute across the full technology stack, building new product capabilities while maintaining a strong focus on quality and automated testing. The role combines hands-on development with technical ownership, architectural thinking, and continuous exploration of new technologies. You will work closely with a distributed engineering team to shape technical solutions, coding standards, and development practices. The environment values autonomy, curiosity, attention to detail, and a strong sense of ownership. You will have the opportunity to make a meaningful impact on a growing SaaS product while working with a modern cloud-based technology stack. Accountabilities: + Deliver senior-level implementation of new product features across the full technology stack. + Own projects from technical conceptualization through implementation, testing, launch, and continuous improvement. + Design and implement reliable, maintainable, and scalable software solutions. + Build comprehensive test automation for new development, including unit and integration testing. + Solve complex technical challenges while balancing product requirements, engineering quality, and maintainability. + Research, evaluate, propose, test, and implement new technologies, techniques, and development approaches. + Collaborate with engineers and other stakeholders on technical design, coding standards, development practices, and best practices. + Contribute to maintaining a high-quality engineering environment with minimal technical debt. + Continuously improve development processes, tooling, and engineering practices. + Take ownership of technical decisions and proactively identify opportunities to improve the product and engineering experience. ## Related Videos - [Web APIs you might not know about](https://www.wearedevelopers.com/videos/281-web-apis-you-might-not-know-about) - [Are you still programming unit tests or already generating?](https://www.wearedevelopers.com/videos/722-are-you-still-programming-unit-tests-or-already-generating) - [Introducing a Digital Service Catalog for speed and scale](https://www.wearedevelopers.com/videos/763-introducing-a-digital-service-catalog-for-speed-and-scale) - [Build and Deploy a Fullstack App with Open Source Tooling](https://www.wearedevelopers.com/videos/775-build-and-deploy-a-fullstack-app-with-open-source-tooling) - [Project Fugu: Extending the web](https://www.wearedevelopers.com/videos/832-project-fugu-extending-the-web) - [Coffee with Developers](https://www.wearedevelopers.com/videos/354-coffee-with-developers) ## Related Articles - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Fullstack Developer Salary UK](https://www.wearedevelopers.com/magazine/251-fullstack-developer-salary-uk) - [The 12 Best Jobs for Software Engineers](https://www.wearedevelopers.com/magazine/401-the-12-best-jobs-for-software-engineers) - [Top-Paying Tech Jobs (with Salaries)](https://www.wearedevelopers.com/magazine/372-top-paying-tech-jobs-with-salaries) - [Where to Find Entry-Level Software Engineering Jobs](https://www.wearedevelopers.com/magazine/397-where-to-find-entry-level-software-engineering-jobs) - [Where To Find Software Engineering Jobs](https://www.wearedevelopers.com/magazine/396-where-to-find-software-engineering-jobs)