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Offensive Security Engineer

Finix · San Francisco

$180k - $230k
On-site
Full-time
Mid
Engineering

Posted November 10, 2026

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AI Summary

Finix is seeking an Offensive Security Engineer to plan and execute red and purple team exercises across web applications, APIs, AWS, Kubernetes, and corporate environments, including PCI DSS penetration and segmentation testing for its cardholder data environment. The role also involves threat modeling with Engineering, reviewing Java source code for flaws, validating bug bounty and third-party findings, and building automation and AI-assisted tooling to scale offensive testing. This is an in-office position in San Francisco at a well-funded fintech payments company.

Job Description

About Finix

Finix is building the global operating system for fintech, starting with payments. From startups to publicly traded companies, Finix processes tens of billions of dollars annually both in-store and online. Finix was founded in 2015 and is headquartered in San Francisco.
 
To date Finix has raised over $200M, including a $75M Series C led by Acrew Capital and Lightspeed Venture Partners and backed by American Express Ventures, Bain Capital Ventures, Homebrew, Inspired Capital, Visa, and others

About the Role:
 
The Engineering organization at Finix owns the delivery and stability of our product end to end. As an Offensive Security Engineer, you will find weaknesses in Finix’s applications, cloud infrastructure, and corporate environment before attackers do, and work with engineers to fix them. You will run our internal penetration testing program and work closely with Engineering, Information Security, Compliance, and IT.

This is an in-office position based in our San Francisco office.

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