Lead Full-Stack Software Engineer (React +.NET) - €80-90K

Location: Madrid (Central) | Full-time | 100% On-site | Flexible hoursSalary: 80-90k

About the roleWe are partnering with a leading European financial services company building a new innovation hub in Madrid. They are looking for a Senior Full-Stack Engineer with strong .NET expertise, a passion for AI, and proven leadership in technical delivery.

You will help shape the next generation of AI-driven advisory tools, supporting financial advisors with intelligent assistants that automate complex tasks and improve decision-making.

What you'll do

Architect and develop scalable web applications using C# and modern .NET frameworks

Build AI-driven features using LLMs and AI agents

Lead technical decisions and contribute to product direction

Apply advanced prompt engineering to optimise AI behaviour

Collaborate with product teams to translate business needs into technical solutions

Mentor and support other engineers, driving bes...