Remote Senior Cloud Security Engineer - Infra & Automation

Sezzle; United States; Remote; USD 56,000 - 106,000; Full time

Job summary

Sezzle is seeking a hands-on Senior Security Infrastructure Engineer to strengthen security across cloud infrastructure, applications, and developer workflows in a fast-paced fintech environment.

You will own vulnerability management, SIEM/XDR capabilities, and incident response, partnering with engineers to embed security into CI/CD and supply chain practices. Strong AWS/Kubernetes/Linux expertise is required for scalable security.

Qualifications

• 6+ years of security, software, or infrastructure engineering experience.
• Experience with threat modelling and security design reviews for modern systems.
• Hands-on vulnerability management across cloud, infrastructure, and applications.
• Strong knowledge of AWS, Linux, and Kubernetes security design and hardening.

Responsibilities

• Lead and operate vulnerability management across infrastructure, platforms, and applications, validating true positives and driving remediation with engineering teams.
• Build, operate, and mature SIEM/XDR capabilities, including log ingestion, detection rule development, alert tuning, and investigation workflows.
• Investigate and respond to security incidents across cloud infrastructure and applications, performing root cause analysis and driving long‑term fixes.
• Design and implement detection strategies for suspicious activity, including data exfiltration patterns using telemetry from applications and databases.
• Lead threat modelling exercises and security design reviews to identify risks early and strengthen architecture.
• Drive infrastructure and CI/CD hardening initiatives, reducing software supply chain risk.
• Lead efforts to implement and improve dependency and container supply chain risk detection systems and controls.
• Partner with engineering teams to remediate vulnerabilities and improve secure development and deployment practices.
• Support and implement security controls aligned with PCI DSS, SOC 2, and other compliance requirements.
• Develop automation (including AI) to improve efficiency in security operations, detection, and response.

Skills

AWS

Kubernetes

Linux

Cloud security

Threat modelling

Incident response

Security engineering

AI/automation

CI/CD security

Security operations

Tools

Wazuh

Splunk

ELK

Snyk

Trivy

Grype

Claude AI

Gitlab

Job description

Sezzle is seeking a hands-on Senior Security Infrastructure Engineer to strengthen security across cloud infrastructure, applications, and developer workflows in a fast-paced fintech environment.

You will own vulnerability management, SIEM/XDR capabilities, and incident response, partnering with engineers to embed security into CI/CD and supply chain practices. Strong AWS/Kubernetes/Linux expertise is required for scalable security.