Hey there, Cybersecurity Enthusiasts ð️At Factorial, we're on the hunt for a skilled Application Security Engineer to join our Security Team. If you have a passion for ethical hacking and want to make an impact in a dynamic tech environment, we'd love to hear from youðAbout the team ðSecurity at Factorial works side by side with Product and Engineering to help a fast-moving, AI-native company ship without losing control of risk. Our mission is to protect Factorial and our customers while making security a practical part of how software is designed, built, tested, and operated.The work goes far beyond finding vulnerabilities: we test real product surfaces, help teams fix issues properly, and turn repeated security needs into guardrails, automation, and CI/CD controls that developers can use every day. AI is part of Factorial’s culture, product, and way of working from day one, so Security also helps define how teams use agents, LLMs, tools, and company data safely at scale,



while actively challenging those systems with an attacker mindset.It’s a team for people who want to keep learning, move across different security problems, and build security that can keep up with the speed of the company.Perform proactive penetration testing across Factorial’s applications, APIs, infrastructure, and AI-powered features.Collaborate with development teams to remediate security findings and enhance secure coding practices.Improve how we validate, triage, and remediate vulnerabilities from bug bounty reports, internal testing, automated controls, and external research.Hunt for recurring or legacy vulnerability patterns based on root cause analysis, previous incidents, and security findings.Build and improve security automations, agents, skills, and CI/CD controls that help engineering teams catch and fix issues earlier.Help secure Factorial’s use of AI across product and internal workflows, including LLMs, agents, data access, tools, permissions, and abuse scenarios.Contribute to th

📌 Cyber Defence Engineer (Barcelona)
🏢 Factorial Hr
📍 Barcelona