Senior Security Infrastructure Engineer

Sezzle

Senior Security Infrastructure Engineer enhancing Sezzle's security across cloud infrastructure and applications. Ideal for a hands-on engineer addressing real-world security challenges.

Posted 6/25/2026full-timeRemote • 🇨🇱 ChileSenior💰 $5,000 - $9,500 per monthWebsite

Tech Stack

Tools & technologies

AWSCloudKubernetesLinuxSplunk

About the role

Key responsibilities & impact

Lead and operate vulnerability management across infrastructure, platforms, and applications - including internal scans, dependency analysis, and external findings, 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 application and database telemetry
Lead and contribute to threat modeling exercises and security design reviews to identify risks early and strengthen architecture
Apply deep expertise in AWS and Kubernetes to design, secure, and improve resilient and secure cloud infrastructure at scale
Drive infrastructure and CI/CD hardening initiatives, with a focus on reducing software and container supply chain risk
Lead efforts to implement and improve dependency and container supply chain risk detection systems and controls
Partner closely 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 and implement automation (including AI where appropriate) to improve efficiency in security operations, detection, and response
Triage and validate external security findings, distinguishing true positives and coordinating remediation

Requirements

What you’ll need

6+ years of experience in security, software, or infrastructure engineering
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 (e.g., Wazuh, Splunk, ELK) 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 (e.g., Snyk, Trivy, Grype, etc.)
Ability to investigate issues directly using logs, cloud tooling, and system-level data
Knowledge of common security vulnerabilities and mitigation strategies (OWASP, SANS, etc.)
Working knowledge of compliance frameworks such as PCI DSS and SOC 2
Demonstrated experience working with Claude or equivalent large language model tools is required; candidates must be comfortable leveraging AI to enhance productivity, research, and communication.

Benefits

Comp & perks

Sezzle is focused on using open source, and we build what we can before buying!

ATS Keywords

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Hard Skills & Tools

vulnerability managementthreat modelingsecurity design reviewsincident responseroot cause analysisautomationcloud securityCI/CD hardeningcontainer securitydependency security

Soft Skills

leadershipcollaborationcommunicationproblem-solvinganalytical thinking

Certifications

PCI DSSSOC 2