Application Security Engineer
HybridDublin, Leinster, Ireland
Job Summary
Own and engineer tier-zero security capabilities including authentication, SAML/SSO, permissions systems, audit logging, and malicious URL scanning. Design, build, and evolve customer-facing security features while partnering with engineering teams throughout the software development lifecycle to make secure development the default. Perform architecture reviews, threat modelling exercises, and security assessments for new features, then build security tooling and automation to support secure adoption of AI-assisted development workflows. Lead application security initiatives from problem definition through implementation, driving initiatives that help teams identify and address risks early. Participate in a shared on-call rotation to lead incident response, investigation, and remediation efforts. Help shape Fin's AI-first approach to security, including AI-powered detection, red-team automation, and continuous monitoring for emerging defensive capabilities.
Required Qualifications
- Proven application security, product security, or security engineering experience within a SaaS environment
- Strong software engineering skills with experience designing, building, and operating production systems
- Deep understanding of modern application security threats, secure software development practices, and threat modelling
- Experience designing, building, or securing authentication, authorization, identity, or enterprise security capabilities
- Experience conducting architecture reviews and security assessments for complex systems
- Hands-on security incident response experience, including leading investigations and remediation efforts
- Strong programming skills and experience building tools, automation, or developer-focused solutions
- Comfortable using modern AI-assisted development tools to improve productivity and engineering effectiveness
- Ability to communicate security concepts clearly and collaborate effectively with engineering teams
- A pragmatic approach to balancing security, customer impact, and engineering velocity
- Experience working across both large-scale SaaS environments and high-growth companies
- Must be able to work in the office at least three days per week
Desired Qualifications
- Experience building or owning authentication, SAML/SSO, identity, or access management capabilities
- Experience securing AI-powered products or familiarity with security considerations for large language models, agentic systems, retrieval-based architectures, or AI tool integrations
- Experience building security automation or security-focused platform capabilities at scale
- Familiarity with cloud security, infrastructure security, or distributed systems
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