{"schemaVersion":"jobsearcher.job.v1","id":"e92f689f7d89f49ca02e7867","url":"https://jobsearcher.com/jobs/e92f689f7d89f49ca02e7867","canonicalUrl":"https://jobsearcher.com/jobs/e92f689f7d89f49ca02e7867","title":"Offensive Security Engineer","description":"About Finix\n\nFinix 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.\n\nTo 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\n\nAbout the Role:\n\nThe 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.\n\nThis is an in-office position based in our San Francisco office.\nYou Will:\nPlan and run red team tests across our web applications, APIs, AWS infrastructure, Kubernetes, and corporate environment\nPerform PCI DSS penetration testing and segmentation testing for our cardholder data environment as a Level 1 service provider\nTest new features and architecture changes, and partner with Engineering on threat modeling and secure design\nReview source code, especially Java services, for security flaws, and help engineers understand and fix them\nRun purple team exercises with detection and incident response to validate and improve our alerting\nValidate and reproduce bug bounty and third-party pentest findings, and assess their real-world impact\nWrite clear reports with reproducible steps, business impact, and practical remediation guidance, and retest fixes\nBuild tooling and automation to scale offensive testing and catch regressions\nUse frontier AI models to accelerate offensive testing, including building AI-assisted workflows and agents for recon, code review, vulnerability discovery, and exploit validation\nDeploy and operate self-hosted AI models for security testing, so source code, findings, and sensitive data stay inside Finix’s environment\nTest internal AI tooling and LLM integrations for prompt injection, data leakage, and abuse\nYou Have:\n4+ years of hands-on offensive security experience, such as penetration testing, red teaming, or application security testing\nDeep web application and API testing skills\nExperience attacking cloud environments, especially AWS\nProficiency in Python or Go, the ability to read and review Java code, and mastery with tools like Burp Suite\nHands-on experience using frontier AI models in offensive security work, such as AI-assisted code review, fuzzing, or automated testing agents\nStrong ability to explain findings and risk to engineers and non-technical stakeholders\nSound judgment and respect for scope and rules of engagement when testing production-adjacent systems\nNice to Have:\nPublished CVEs, security research, conference talks, or recognition in bug bounty programs\nCTF experience\nKubernetes and container security testing (EKS)\nMobile or Android application testing\nActive Directory, Okta, or identity provider attack techniques\nFamiliarity with payment systems, such as card networks, HSMs, or ISO 8583\nLLM and AI application security testing\n-\nFinix is an equal opportunity employer and values diversity. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, disability status, or any other protected class.\n\nRole: Security Engineer\nLevel: IC4-IC5\nLocation: San Francisco, CA\nCompensation Range: $180,000 - $230,000/year + Equity + Benefits\n\nOur salary ranges are determined by role, level, and location. The range displayed on each job posting reflects the minimum and maximum target for new hire salaries at our headquarters in San Francisco, California. Individual pay is determined by work location, job related skills, experience, and relevant education or training.\nWe may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.","company":"Finix","rawCompany":"finix","city":"Millbrae","state":"CA","isRemote":false,"isActive":false,"createdAt":"2026-11-12T09:41:02.897Z","occupations":[{"code":"15-1299.05","title":"Information Security Engineers","slug":"information-security-engineers"},{"code":"15-1299.04","title":"Penetration Testers","slug":"penetration-testers"},{"code":"15-1299.08","title":"Computer Systems Engineers/Architects","slug":"computer-systems-engineers-architects"}],"industries":[{"code":"541512","title":"Computer Systems Design Services","slug":"computer-systems-design-services"},{"code":"541511","title":"Custom Computer Programming Services","slug":"custom-computer-programming-services"},{"code":"513210","title":"Software Publishers","slug":"software-publishers"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"Offensive Security Engineer","description":"About Finix\n\nFinix 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.\n\nTo 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\n\nAbout the Role:\n\nThe 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.\n\nThis is an in-office position based in our San Francisco office.\nYou Will:\nPlan and run red team tests across our web applications, APIs, AWS infrastructure, Kubernetes, and corporate environment\nPerform PCI DSS penetration testing and segmentation testing for our cardholder data environment as a Level 1 service provider\nTest new features and architecture changes, and partner with Engineering on threat modeling and secure design\nReview source code, especially Java services, for security flaws, and help engineers understand and fix them\nRun purple team exercises with detection and incident response to validate and improve our alerting\nValidate and reproduce bug bounty and third-party pentest findings, and assess their real-world impact\nWrite clear reports with reproducible steps, business impact, and practical remediation guidance, and retest fixes\nBuild tooling and automation to scale offensive testing and catch regressions\nUse frontier AI models to accelerate offensive testing, including building AI-assisted workflows and agents for recon, code review, vulnerability discovery, and exploit validation\nDeploy and operate self-hosted AI models for security testing, so source code, findings, and sensitive data stay inside Finix’s environment\nTest internal AI tooling and LLM integrations for prompt injection, data leakage, and abuse\nYou Have:\n4+ years of hands-on offensive security experience, such as penetration testing, red teaming, or application security testing\nDeep web application and API testing skills\nExperience attacking cloud environments, especially AWS\nProficiency in Python or Go, the ability to read and review Java code, and mastery with tools like Burp Suite\nHands-on experience using frontier AI models in offensive security work, such as AI-assisted code review, fuzzing, or automated testing agents\nStrong ability to explain findings and risk to engineers and non-technical stakeholders\nSound judgment and respect for scope and rules of engagement when testing production-adjacent systems\nNice to Have:\nPublished CVEs, security research, conference talks, or recognition in bug bounty programs\nCTF experience\nKubernetes and container security testing (EKS)\nMobile or Android application testing\nActive Directory, Okta, or identity provider attack techniques\nFamiliarity with payment systems, such as card networks, HSMs, or ISO 8583\nLLM and AI application security testing\n-\nFinix is an equal opportunity employer and values diversity. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, disability status, or any other protected class.\n\nRole: Security Engineer\nLevel: IC4-IC5\nLocation: San Francisco, CA\nCompensation Range: $180,000 - $230,000/year + Equity + Benefits\n\nOur salary ranges are determined by role, level, and location. The range displayed on each job posting reflects the minimum and maximum target for new hire salaries at our headquarters in San Francisco, California. Individual pay is determined by work location, job related skills, experience, and relevant education or training.\nWe may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.","datePosted":"2026-11-12T09:41:02.897Z","dateModified":"2026-11-12T09:41:02.897Z","hiringOrganization":{"@type":"Organization","name":"Finix","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"Millbrae","addressRegion":"CA","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"e92f689f7d89f49ca02e7867"},"url":"https://jobsearcher.com/jobs/e92f689f7d89f49ca02e7867"}}