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Factorial builds AI Business Management Software for companies of all sizes.
Its platform centralizes workflows across HR, Finance, Talent, Operations, and IT, helping teams reduce manual processes.
Factorial is a SaaS company headquartered in Barcelona.
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Perform proactive penetration testing across applications, APIs, infrastructure, and AI-powered features
Reproduce and validate vulnerability reports submitted by third parties, including the bug bounty program
Collaborate with development teams to remediate security findings and improve secure coding practices
Improve vulnerability validation, triage, and remediation processes
Hunt for recurring or legacy vulnerability patterns through root cause analysis, previous incidents, and security findings
Build and improve security automations, agents, skills, and CI/CD controls
Help secure the use of AI across product and internal workflows, including LLMs, agents, data access, tools, permissions, and abuse scenarios
Contribute to the development of security tools, automations, and infrastructure
Stay up to date with security research, threats, attack techniques, and emerging AI security risks
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3+ Years of professional experience in Application Security, Offensive Security, or Penetration Testing
Mandatory experience in Web Application Penetration Testing




Degree in Engineering or Computer Science
Strong knowledge of web applications, databases, network protocols, operating systems, cybersecurity fundamentals, CVSS, testing methodologies, and tooling
Proficiency in scripting or programming languages used in security testing and automation, such as Python or Bash
Ability to work across different security problems and reason critically
Ability to build tools, automations, guardrails, and scalable practical security solutions
Curiosity and willingness to learn AI security topics, including LLM testing, prompt injection, agentic workflows, data exposure, tool permissions, RAG security, and secure AI adoption
Fluent English
Nice to have: BSCP or eWPTX certifications, experience with Ruby / Ruby on Rails applications
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Base salary of ***€ plus 7-10% variable performance pay paid quarterly
ESOP plan
Alan private health insurance
Wellhub gym, pool, and outdoor class benefits
Cobee expense savings
Language classes
Breakfast at the office and organic fruit
Food discounts with Nora
Pet-friendly workplace
On-site work several days a week (80%) with remote work supported when it makes sense (20%)
Office-first, adaptable approach
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📌 Security Engineer In Saas (España)
🏢 Factorial
📍 España