Senior Security Engineer

We're looking for a hands-on Senior Security Engineer to join one of our clients and own the technical security posture of their platform, infrastructure, and AI-driven systems. You'll spend most of your time in the systems themselves: hardening infrastructure, closing vulnerabilities, and building the guardrails that keep their AI-driven workflows safe.

Following their recent Series A, they're scaling rapidly and investing deeply in platform security, AI safety, and operational resilience. This is a builder's role, not a policy role. You'll work closely with Engineering to secure production systems, find weaknesses, and keep our monitoring and incident response sharp as we scale.

You'll join a high-ownership, high-trust engineering culture where self-starters thrive and autonomy is the natural state of work.

Key Responsibilities

Security Engineering & System Hardening

• Secure and harden cloud infrastructure, applications, APIs, internal systems, and operational workflows.
• Implement and maintain security controls across production environments, CI/CD pipelines, cloud infrastructure, and internal tooling.
• Work directly with engineering teams to remediate vulnerabilities and improve secure development practices.
• Ensure encryption, secrets management, logging, monitoring, and access controls are properly implemented and continuously maintained.
• Design and improve security architecture across cloud-native and distributed systems.
• Build scalable security processes that integrate directly into engineering and operational workflows.

Vulnerability Management & Offensive Security

• Continuously identify, assess, prioritize, and remediate security vulnerabilities across infrastructure, applications, APIs, and operational systems.
• Proactively search for weaknesses through vulnerability scanning, penetration testing, adversarial testing, threat modeling, and manual security reviews.
• Coordinate remediation efforts across engineering and operations teams, and validate fixes to ensure long-term mitigation.
• Improve detection and prevention capabilities for emerging threats.
• Help establish a culture of continuous security improvement and operational accountability.

AI Security & Emerging Threat Protection

• Secure AI-driven systems and automated agents against prompt injection, adversarial inputs, unauthorized or unintended actions, unsafe outputs, and data leakage.
• Design and implement guardrails and validation layers for AI-generated actions.
• Ensure AI systems safely handle untrusted inputs from IVRs, web systems, APIs, and human interactions.
• Monitor AI system behavior for anomalies, abuse attempts, or unsafe decision-making.
• Partner with engineering teams to ensure AI systems are observable, auditable, bounded, and fail safely.
• Help define operational and technical controls for responsible AI deployment.

Monitoring, Detection & Incident Response

• Improve and maintain security monitoring, alerting, logging, and incident response capabilities.
• Investigate suspicious activity, anomalies, and potential security incidents.
• Lead or support incident response efforts, root cause analysis, and remediation planning.
• Ensure operational visibility into system health, access patterns, and security events.
• Recommend and implement preventative measures following incidents or security discoveries.

Required Qualifications

• 7+ years of hands-on experience in security engineering, infrastructure security, application security, DevSecOps, or offensive security.
• Exceptional knowledge of the AWS ecosystem.
• Demonstrated experience identifying and remediating vulnerabilities in live production systems.
• Self-starter mindset: able to drive projects, make decisions, and prioritize ruthlessly in a fast-moving environment.
• Strong communication skills, with the ability to explain technical security issues clearly to engineering stakeholders.

Preferred Qualifications

• Experience securing AI/LLM-powered systems or automated agents.
• Familiarity with prompt injection attacks, adversarial AI techniques, AI guardrails, and behavioral anomaly detection.
• Experience with cloud security tooling, SIEM and observability platforms, penetration testing tools, endpoint security platforms, and infrastructure-as-code security.
• Prior experience in high-growth startup, fintech, banking, or payments environments.
• Certifications such as CISSP, CISM, AWS Security Specialty, or similar.

Extra

• 100% remote-first culture (work anywhere in the US or Canada)
• Competitive salary and equity opportunities
• Unlimited PTO, flexible schedule, and paid holidays
• Comprehensive health, dental, and vision insurance
• A culture built on ownership, transparency, autonomy, and craftsmanship
• Real opportunities for architecture ownership and technical leadership