Staff Software Engineer - AI-First, Impactful Builder

Taxfix Group is seeking a Staff Software Engineer in Madrid to build core features for their flagship product, turning complex tax scenarios into simple, reliable experiences. You will work hands-on in a cross-functional team, with deep expertise in frontend or backend engineering and AI-first software development. You’ll collaborate across design, product, and engineering to move from idea to impact quickly, raise the bar on scalability, quality, and maintainability, and own outcomes from J-18…