Role Overview
The Senior Security Infrastructure Engineer role at Sezzle is a remote, hands-on position based in Mexico designed for professionals with extensive experience in cloud security. This opportunity suits a proactive security practitioner who wants to take ownership of risk identification, vulnerability management, and infrastructure hardening across cloud systems.
Key Responsibilities
Lead and operate vulnerability management across infrastructure, platforms, and applications, handling internal scans, dependency analysis, and external findings.
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 while performing root cause analysis.
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 in the architecture phase.
Apply expertise in AWS and Kubernetes to design, secure, and improve resilient cloud infrastructure at scale.
Drive infrastructure and CI/CD hardening initiatives to reduce software and container supply chain risks.
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.
Requirements
6+ years of experience in security, software, or infrastructure engineering, with hands-on experience securing cloud-based production systems.
Experience contributing to threat modeling and security design reviews for modern systems.
Strong hands-on experience in vulnerability management, scanning, triage, validation, remediation coordination, and verification.
Experience working with SIEM platforms such as Wazuh, Splunk, or ELK for detection engineering, monitoring, and incident response.
Strong knowledge of AWS, Linux, and Kubernetes infrastructure, including security architecture and hardening.
Experience improving infrastructure security, including CI/CD hardening and mitigating software supply chain risks.
Familiarity with container and dependency security tools like Snyk, Trivy, or Grype.
Working knowledge of compliance frameworks such as PCI DSS and SOC 2.
Demonstrated experience working with Claude or equivalent large language model tools 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.
Experience assessing application and infrastructure risk and translating 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.
Skills and Tools
Languages: Python, Golang, TypeScript
Frontend: React, React Native
Cloud and DevOps: AWS, Kubernetes, Linux, Git, GitLab
Security Tools: SIEM platforms, Snyk, Trivy, Grype, Wazuh, Splunk, ELK, Claude or equivalent LLMs
Databases: MySQL, Postgres, Elasticsearch
Salary and Benefits
Compensation range: $5,000 - $9,500 USD per month in gross amount, based on experience level.
About the Company
Sezzle is a mission-driven organization focused on financially empowering the next generation by revolutionizing the shopping experience beyond payments. The company blends cutting-edge technology with interest-free installment plans to make shopping smarter and more accessible. Sezzle builds an innovative and dynamic team passionate about driving real impact on merchant sales and consumer experiences while utilizing a technology stack centered around open-source tools and modern cloud infrastructure.
How to Apply
Interested candidates should visit the official Sezzle careers page to submit an application for this remote position.
