Staff Software Engineer – AI-Driven Tax Platform, Full-Stack

Taxfix in Madrid is seeking a Staff Software Engineer to build core features for our flagship product, turning complex tax scenarios into simple, reliable experiences. You will own end-to-end work in a cross-functional team, with a strong emphasis on AI-assisted engineering and maintainable design across frontend and backend systems. You will collaborate across product and platform teams, ensuring scalable architecture, quality, and rapid delivery while promoting responsible AI practices and J-…