Senior Security Infrastructure Engineer

🕒 June 25

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Sezzle

WebsiteLinkedInAll 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.

📋 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 • 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.