Senior Security Infrastructure Engineer

Sezzle

Senior Security Infrastructure Engineer at Sezzle strengthening security across cloud infrastructure and applications. Lead vulnerability management, incident response, and security automation efforts.

Posted 6/25/2026full-timeRemote • 🇨🇴 ColombiaSenior💰 $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
Drive infrastructure and CI/CD hardening initiatives, with a focus on reducing software and container supply chain risk
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
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.)
Knowledge of common security vulnerabilities and mitigation strategies (OWASP, SANS, etc.)
Working knowledge of compliance frameworks such as PCI DSS and SOC 2.

Benefits

Comp & perks

🌐 Worldwide ❌ Jobs You've Hidden ⭐️ Saved Jobs ✅ Applied Jobs ✉️ Email Alerts 👤 Account Sezzle Website LinkedIn All Job Openings 201 - 500 employees Founded 2016 💳 Fintech 👥 B2C 🛍️ eCommerce Fintech
B2C
eCommerce Sezzle is a financial technology company that offers a "buy now, pay later" service, allowing consumers to purchase products and pay for them in four interest-free installments over six weeks. The Sezzle app provides users with a flexible financing alternative to traditional credit cards, enabling instant approval decisions without impacting credit scores. Sezzle partners with various top brands, including Amazon, Walmart, and Target, to offer in-app and in-store payment options. The company's mission is to empower consumers financially by providing more financial freedom and control. It is available as a mobile app, with millions of downloads and high user ratings, and works towards accessibility and inclusion on its platform. Senior Security Infrastructure Engineer 🔥 29 minutes ago 🇨🇴 Colombia – Remote 💵 $5k - $9.5k / month ⏰ Full Time 🟠 Senior 👷 Infrastructure Engineer AWS Cloud Kubernetes Linux Splunk Apply Now Find Hiring Managers Customize resume + cover letter Report problem ☆ Save ☑️ Mark as applied ❌ Hide 📋 Description
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
Drive infrastructure and CI/CD hardening initiatives, with a focus on reducing software and container supply chain risk
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
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.)
Knowledge of common security vulnerabilities and mitigation strategies (OWASP, SANS, etc.)
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Applicant Tracking System Keywords

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Hard Skills & Tools

vulnerability managementincident responsedetection engineeringroot cause analysisautomationCI/CD hardeningsecurity architecturecontainer securitydependency securitylog ingestion

Soft Skills

leadershipcommunicationcollaborationproblem-solvinganalytical thinking

Certifications

PCI DSSSOC 2