OverviewSenior C# Software Engineer (AI & Innovation)Location: Madrid (Central) | Job Type: Full-time | 100% On-site with Versátil Hours | Experience: Around 5+ yearsAbout the RoleWe are looking for aSenior C# Software Engineerwith a strong interest inArtificial Intelligence and innovationto join a newly created tech team in Madrid. This role is ideal for someone who enjoys solving complex problems, building products from scratch, and working at the intersection ofsoftware engineering, AI, and product innovation .You will play a key role in designing and developingAI-powered web applicationsthat enhance decision-making and automate complex workflows. This is not a maintenance role - you will be involved inarchitecture, design decisions, and innovationfrom day one.ResponsibilitiesDesign, develop, and maintainscalable web applicationsusingC# and modern .NET frameworks .Architect and implementAI-driven solutions, including AI Agents and integrations withLarge Language Models (LLMs) .ApplyPrompt Engineeringtechniques to optimize AI behavior and outputs within applications.Work closely with product and business teams to translate real-world needs into robust technical solutions.Tackle complex architectural and logical challenges with a high degree of autonomy and ownership.Contribute to technical decisions, best practices,



and continuous improvement of the platform.QualificationsMandatory requirements:Bachelor's or Master's degree inComputer Science(or equivalent).Strong, hands-on experience withC# and .NETat a senior level.Solid understanding ofAI concepts, including AI Agents, RAG, and Prompt Engineering.Experience usingGitHub Copilot or similar AI-assisted development tools .FluentEnglish(spoken and written).Excellent problem-solving skills, analytical thinking, and ability to understand complex systems quickly.Nice to have:Experience withPython .Previous exposure toFintech or financial servicesenvironments.Interest in AI product design and human-AI interaction.What’s OfferedCompetitive salary: 45-55k €depending on experience.Modern offices incentral Madrid .Fully flexible working hours(onsite presence required, schedule is up to you).Opportunity to work oncutting-edge AI projectswith real business impact.Continuous learning and professional development in AI and modern software engineering.International, multicultural environment where ideas and technical excellence are valued.A collaborative culture that valuesface-to-face innovation, ownership, and high-quality engineering.#J-18808-Ljbffr

📌 Senior C Developer- On Site Madrid - €45.000 - €55.000 A Year
🏢 E-Frontiers
📍 Madrid