Factorial HR is seeking a Staff Software Engineer to join the DX and Performance team in Madrid, focusing on performance, reliability, observability, and AI-assisted workflows. You will shape how Factorial defines, measures, and improves system health and scalability across product and infrastructure.You’ll contribute hands-on, provide technical leadership, and help teams adopt stronger performance practices at scale in a multicultural, English-speaking environment.#J-18808-Ljbffr