Factorial is seeking an Application Security Engineer to proactively hunt vulnerabilities across its applications, APIs, and AI-powered features. You will work with Product and Engineering to remediate findings, improve secure coding, and scale security through automation. The role emphasizes collaboration with cross-functional teams, triage of bug bounty reports, and advancement of security tooling within a fast-moving AI-native company based in Barcelona. Fluency in English is required. #J-18808-Ljbffr