Senior Security Infrastructure Engineer

Sezzle is seeking a Senior Security Infrastructure Engineer to help strengthen its security posture across cloud infrastructure, applications, and developer workflows. The role involves hands-on security operations, threat modeling, and design work, with a focus on improving efficiency, visibility, and resilience across the organization.

Requirements

• 6+ years of experience in security, software, or infrastructure engineering
• Hands-on experience securing cloud-based production systems
• Experience contributing to threat modeling and security design reviews for modern systems
• Strong hands-on experience in vulnerability management, including scanning, triage, validation, remediation coordination, and verification
• Experience working with SIEM platforms for detection engineering, monitoring, and incident response
• Practical experience triaging findings from vulnerability scanners and bug bounty programs
• Strong knowledge of AWS, Linux, and Kubernetes infrastructure, including security architecture, hardening, and operational best practices
• Experience improving infrastructure security, including CI/CD hardening and mitigating software supply chain risks
• Experience with container and dependency security tools
• Ability to investigate issues directly using logs, cloud tooling, and system-level data
• Knowledge of common security vulnerabilities and mitigation strategies
• Working knowledge of compliance frameworks such as PCI DSS and SOC 2

Benefits

• Generous Paid Time Off
• 401k Matching
• Retirement Plan
• Visa Sponsorship
• Four Day Work Week
• Generous Parental Leave
• Tuition Reimbursement
• Relocation Assistance