Senior Software Engineer — AI‑Driven Full‑Stack Impact

Taxfix; Madrid; Híbrido; EUR 60.000 - 90.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Mental health coaching

Yoga

Monthly flexible spending allowance

Employee stock options

30 vacation days

Flexible working hours

Work from abroad up to six weeks

Team social events

Free tax declaration filing

Dogs in the office

Descripción de la vacante

Taxfix, Madrid-based, is seeking a senior software engineer to build core features for our flagship product. You’ll own end‑to‑end delivery in a cross‑functional team, turning complex tax scenarios into reliable experiences with an AI‑first approach.

You’ll contribute across frontend and backend with React and Node.js, collaborate with product, design and security, and help raise the bar for scalable design, quality and maintainability.

Formación

• Experience with React and Node.js for building frontend and backend services.
• React Native experience is a plus.

Responsabilidades

• Partner with product management, design, and engineering to understand problems and deliver outcomes.
• Own work end to end—from discovery to release and iteration.
• Turn ambiguity into action with sound trade-offs for maintainability.
• Contribute to technical direction and strategy for the long‑term product vision.
• Use AI-assisted development tools to accelerate exploration, implementation, testing, and documentation.
• Evaluate AI-generated output and prompt effectively; share practical learnings.
• Improve developer experience through tooling and practices for reliable delivery.
• Collaborate across product and platform teams and foster learning and growth.
• Support cross‑functional collaboration and safe challenging of ideas.

Conocimientos

React

Node.js

Descripción del empleo

Taxfix, Madrid-based, is seeking a senior software engineer to build core features for our flagship product. You’ll own end‑to‑end delivery in a cross‑functional team, turning complex tax scenarios into reliable experiences with an AI‑first approach.

You’ll contribute across frontend and backend with React and Node.js, collaborate with product, design and security, and help raise the bar for scalable design, quality and maintainability.