Senior AI Software Engineer

November 7, 2026

Hybrid

Senior

Madrid, Spain

Indeed

Also worth knowing

Mandatory office attendance
Includes weekend work
English is required

Description

Senior Software Engineer role focused on being the hands-on advocate of AI within the team, using AI coding agents daily across development, testing, documentation and code review. The product landscape spans modern applications built with C# and .NET and long-lived systems in COBOL, Delphi, PowerBuilder, FoxPro and WinDev, including bringing legacy logic into modern architectures. The role also covers shaping the design of the modern stack, building a shared knowledge base and mentoring less experienced engineers

Responsibilities

Lead by example in the daily use of AI coding agents such as GitHub Copilot, Cursor and Claude Code across development, testing, documentation and code review
Configure and maintain agent setups for the team: rules, instructions, prompt libraries, context files and reusable workflows
Share what works through demos, pair-programming sessions and short internal workshops, helping teammates build confidence with AI tools
Identify repetitive tasks that can be accelerated with agentic approaches and propose practical improvements
Keep an eye on the AI tooling landscape and bring relevant, pragmatic ideas back to the team
Develop, maintain and evolve applications across the full landscape, from C# and .NET to COBOL, Delphi, PowerBuilder, FoxPro and WinDev
Use AI agents to write, review and test code, and to analyze, document and explain legacy code, business rules and data flows
Contribute to modernization initiatives, helping plan and execute migrations from legacy systems to modern architectures
Help shape the design and architecture of the modern stack so it is ready to absorb what is being modernized
Build and maintain a shared knowledge base so expertise in legacy and modern systems is spread across the team
Design, develop and maintain features across backend and frontend applications
Write clean, maintainable code following SOLID principles and good architectural practices
Take part in code reviews, giving and receiving constructive feedback
Work with CI/CD pipelines and cloud environments to build and deploy your work
Work closely with product, QA, DevOps and other engineering teams
Support and mentor less experienced engineers, especially in AI-assisted development practices

Requirements

4 to 6 years of professional software development experience
Proven hands-on, day-to-day experience with AI coding agents such as GitHub Copilot, Cursor or Claude Code, including configuration and rule/instruction management
Experience building agentic workflows, MCP servers or custom AI tooling
Genuine openness and willingness to work with legacy technologies (COBOL, Delphi, PowerBuilder, FoxPro, WinDev)
Solid experience with at least one modern stack, ideally C# / .NET and/or React / TypeScript / JavaScript
Experience with relational databases and SQL
Practical experience writing automated tests (unit, integration and/or end to-end)
Familiarity with Git, CI/CD pipelines and Agile practices
Previous experience with any of COBOL, Delphi, PowerBuilder, FoxPro or WinDev is a plus
Experience in legacy modernization or migration projects
Experience with cloud environments (Azure, AWS or GCP) and Docker
Experience with testing tools such as Playwright, Cypress or Newman
Fluent in English (mandatory)
French and/or Spanish is a plus
Curiosity and a learning mindset: enjoy figuring out how things work, old or new
Natural ability to share knowledge and bring others along, without being dogmatic
Strong analytical and problem-solving skills
Clear communication and collaboration in cross-functional teams
Ownership: drive initiatives to completion