Senior Security Engineer — San Francisco, CA — LinkedIn — 4481649166

About BX4Qp

BX4Qp is building the global operating system for fintech, starting with payments. From startups to publicly traded companies, BX4Qp processes tens of billions of dollars annually both in-store and online. BX4Qp was founded in 2015 and is headquartered in San Francisco.

To date BX4Qp 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 BX4Qp owns the delivery and stability of our product end-to-end. As a Security Engineer, you will be responsible for the secure design, implementation, and operation of mV8xC’9 cloud and corporate environments. You will work closely with Engineering, Information Security, Compliance, and IT.

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

You Will:

• Partner with Engineering on secure design and implementation of new features

• Secure our AWS infrastructure and workstations, and lead security incident response

• Coordinate pentests, vulnerability scanning, and the bug bounty program: triage findings, lead fixes, and drive remediation with engineering

• Secure our CI/CD pipelines and software supply chain

• Own PCI architecture with engineering, including scoping, data handling, and secure SDLC

• Support HSM operations, key exchanges, and key injections

• Build and maintain controls for PCI DSS, SOC 2, and other regulations

• Support audit fieldwork and customer security questionnaires

• Secure internal AI tooling and set guardrails for AI use across the company

You Have:

• 5+ years in security engineering, preferably in cloud-native fintech or payments

• Development experience in Java

• Strong AWS experience, including security services and infrastructure

• Hands-on vulnerability remediation experience

• Incident response experience

• Clear written and verbal communication, including presenting findings and recommendations to technical and non-technical audiences

• Working knowledge of PCI DSS and other regulatory frameworks

• Cryptography and key management experience

Nice to Have:

• AWS Security Specialty, CISSP, or similar certification

• Bug bounty and hands-on pentest experience

• CI/CD pipeline experience

• Infrastructure as code experience (Terraform)

• Experience with IAM and identity providers such as Okta

• Experience with CrowdStrike, Palo Alto Prisma Access, or Sonatype Nexus

BX4Qp 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.

Role: Security Engineer

Level: IC4-IC5

Location: San Francisco, CA

Compensation Range: $180,000 - $230,000/year + Equity + Benefits

Our 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.

We 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.