Argentina, Remote Remote (Global) Full-time USD 60,000 – 114,000 / year

Sezzle is hiring a Senior Security Infrastructure Engineer

Responsibilities

  • 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

  • 6+ years of experience in security, software, or infrastructure engineering, with hands-on experience securing cloud-based production systems and working with real-world security challenges
  • 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

Nice to Have

  • Experience designing and tuning detection rules, reducing alert noise, and improving investigation workflows
  • Strong understanding of cloud-native security controls, including IAM, network segmentation, and container security
  • Familiarity with log-based detection, telemetry pipelines, and security analytics use cases
  • Experience designing secure CI/CD workflows that reduce exposure to vulnerable dependencies and untrusted artifacts
  • Ability to assess application and infrastructure risk and translate findings into actionable improvements
  • Experience aligning technical security work with regulatory and compliance expectations
  • Experience using automation and AI to reduce manual effort and improve consistency at scale

Work Arrangement

Remote (Worldwide)

Additional Information

  • Candidates must be comfortable leveraging AI, including demonstrated experience working with Claude or equivalent large language model tools, to enhance productivity, research, and communication.
Required Skills
SecurityAWSLinuxAutomation
About company
Sezzle
Sezzle is revolutionizing the shopping experience beyond payments, blending cutting-edge tech with seamless, interest-free installment plans that make shopping smarter and more accessible. The company is redefining how people discover, interact with, and purchase the things they love while driving real impact on merchant sales.
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Job Details
Category security
Posted 3 hours ago