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Sr. Security Engineer

FastSpring · USA · DevOps

USD 155000-187000 / yearly About FastSpring: FastSpring is how AI, SaaS, gaming, software, and digital product companies sell online in more places around the world. We handle all payment needs from checkout to taxes so you can go farther faster. Founded in 2005, we are a privately owned company headquartered in Santa Barbara with offices in Amsterdam, Austin, Belfast,… About FastSpring :

FastSpring is how AI, SaaS, gaming, software, and digital product companies sell online in more places around the world. We handle all payment needs from checkout to taxes so you can go farther faster.

Founded in 2005, we are a privately owned company headquartered in Santa Barbara with offices in Amsterdam, Austin, Belfast, Dublin, Halifax, and Singapore.

Sr. Security Engineer

Position Overview:

We are seeking a Sr. Security Engineer to join our Agentic Experience group, reporting to the Principal Engineer, Agentic Development. In this role, you will strengthen the security posture of our core payments platform while helping shape security practices for AI-assisted software development. You will work closely with our Agentic Experience group and our CISO, with visibility to executive leadership. This is a hands-on engineering role with broad scope: application security, cloud infrastructure security, and security review of AI/agentic development tooling.

Responsibilities & Goals:

Identify, prioritize, and remediate vulnerabilities across our Java-based platform and AWS infrastructure

Drive infrastructure security improvements, including IAM policy refinement, instance metadata protections, and network egress controls

Conduct security reviews of AI-assisted development pipelines, tool integrations, and agent-accessible services

Develop and maintain secure development standards, patterns, and guardrails for engineering teams

Partner with the fractional CISO on risk assessment, remediation planning, and co

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