At Frontiers, our purpose is simple yet ambitious: to make science open. We believe open science empowers the global scientific community to accelerate discovery and develop the solutions needed for healthy lives on a healthy planet.
Frontiers is one of the world's largest and most influential open‑access research publishers. Every article we publish is peer‑reviewed and quality‑certified, ensuring research is accessible to everyone, everywhere. Our research has been viewed over 4 billion times, demonstrating the real‑world impact of science without barriers.
Joining Frontiers means being part of a integral, mission‑driven organization at the intersection of science, technology, and innovation—working alongside passionate colleagues who care deeply about advancing knowledge for the benefit of society.
About the Role
We are looking for an enthusiastic Full Stack .NET Engineer to join our team. You will work in the Researcher Profiles Service team, where we build and manage a global‑scale academic data platform. Through powerful APIs and intuitive UIs, we make critical research information accessible to the rest of the company and to end‑users worldwide.
We have fully embraced AI‑based spec‑driven design, integrating AI throughout the entire software development lifecycle. From specification to implementation, AI tooling shapes how we architect, build, and iterate—making us faster, more deliberate, and focused on what matters most. This is not an experiment; it is how we work.
You will take ownership of high‑impact projects and drive them to success in a team that is redefining how modern software is built.
Key Responsibilities

Design, develop, and maintain scalable, high‑performance web applications using .NET and Vue.js




Enhance and support existing solutions built with older versions of .NET and Vue.js
Collaborate with product managers, architects, and other cross‑functional teams to gather requirements, assess technical feasibility, and determine optimal implementation strategies
Collaborate within a multinational, cross‑functional team to deliver software solutions aligned with business needs
Write clean, maintainable, and efficient code while adhering to best practices
Ensure the quality of the delivered solutions
Optimize applications for performance, scalability, and responsiveness
Troubleshoot and resolve complex technical challenges
Conduct code reviews and mentor junior engineers
Possess a willingness to learn, a flexible approach, and stay current with emerging trends in IT to maintain an up‑to‑date technology stack
Have a business‑oriented attitude with a focus on delivering measurable outcomes for end‑users. Demonstrate experience in owning and driving full‑stack projects end‑to‑end, from the specification refinement phase to production monitoring

Requirements

5+ years of experience in software engineering, specializing in .NET Core/Framework
3+ years of hands‑on experience with modern front‑end frameworks (Vue 3 is a plus)
Familiar with Agile/Scrum methodologies
Deep expertise in Vue.js, including Vue 2 and Vue 3, with a strong understanding of state management,



component‑based architecture, and best practices for building scalable front‑end applications
Strong expertise in SQL Server, including performance tuning, indexing strategies, query optimization, and troubleshooting production issues
Heavy experience in implementing APIs with REST and GraphQL
Experience integrating AI solutions into customer‑facing applications
Proficiency in leveraging AI to enhance daily engineering work
Experience in owning complex, distributed system architectures
Solid understanding of microservices and micro‑frontend concepts
Collaborative and thriving in a hybrid environment

Nice‑to‑Have Skills

Experience with NoSQL databases (MongoDB)
Experience with containerization platforms (e.g., Docker, Kubernetes)

Benefits

We prioritize office presence and emphasize in‑person collaboration, but also offer appropriate adjustments where needed, in line with company policy
Extra wellbeing days on top of your annual leave allowance
Up to 3 paid volunteering days each year
24/7 confidential Employee Assistance Programme (wellbeing, mental health, legal & financial support)
Learning & development support via the Frontiers Learning Hub
Competitive local benefits country dependent (e.g. healthcare and pension/retirement provision)

Frontiers actively embraces diversity and is a safe and welcoming workplace. Recruitment is free from discrimination—including based on race, national or ethnic origin, age, religion, disability, sex, gender identity or sexual orientation. With employees from more than 50 different nations, our diversity creates vibrant teams and constantly challenges us to appreciate multiple perspectives.
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📌 Senior Software Engineer (.NET) (Madrid)
🏢 Frontiers
📍 Madrid