Senior Security Engineer, Detection & Response

Overview

Senior Security Engineer, Detection & Response, focused on strengthening security operations across Sezzle's cloud infrastructure and applications, covering detection, incident response, and vulnerability management. The role runs the SIEM and detection capability end-to-end.

What you'll do

• Build, operate, and mature SIEM/XDR capabilities, including log ingestion, detection rule development, alert tuning, and investigation workflows
• Design and implement detection strategies for suspicious activity, including data exfiltration patterns using application and database telemetry
• Extend audit and attribution coverage across the estate (Kubernetes audit logs, database audit logging, SSO and access-path telemetry) so access to sensitive data is attributable to a person or workload, with retention aligned to compliance requirements
• Investigate and respond to security incidents across cloud infrastructure and applications, performing root cause analysis and driving long-term fixes
• Run proactive threat hunts across cloud and identity planes, building agentic hunting workflows that make hunts repeatable
• 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
• Triage and validate external security findings (including bug bounty reports), distinguishing true positives and coordinating remediation
• Contribute to threat modeling and security design reviews for the detection, logging, and incident-response implications of new systems
• Apply strong AWS and Kubernetes judgment to secure the systems you operate and advise owning teams on remediation
• Support and implement security controls aligned with PCI DSS, SOC 2, and other compliance requirements, with logging and detection work producing audit evidence as a by-product
• Develop and implement automation (including AI) to improve efficiency in security operations, detection, and response
• Participate in the on-call rotation for detection and response and the services you own

What you'll need

• 6+ years of experience in security, software, or infrastructure engineering, with hands-on experience securing cloud-based production systems
• Experience working with SIEM platforms (e.g., Wazuh, Splunk, ELK) for detection engineering, monitoring, and incident response
• Experience designing and tuning detection rules, reducing alert noise, and improving investigation workflows
• Strong hands-on experience in vulnerability management, including scanning, triage and validation of scanner and bug-bounty findings, remediation coordination, and verification
• Strong knowledge of AWS, Linux, and Kubernetes infrastructure, including security architecture and operational best practices
• Ability to investigate issues directly using logs, cloud tooling, and system-level data
• Experience assessing the detection and logging implications of new systems in design reviews
• Knowledge of common security vulnerabilities and mitigation strategies (OWASP, SANS, etc.)
• Working knowledge of compliance frameworks such as PCI DSS and SOC 2, particularly logging, monitoring, and evidence expectations
• Demonstrated AI-forward engineering: actively use AI tooling (e.g., Claude Code, Codex, Cursor, or custom LLM integrations) in your work today, with opinions grounded in practice about where it helps and where it doesn't

Nice to have

• Built AI-assisted workflows that others adopted, such as triage, enrichment, or hunting
• Familiarity with log-based detection, telemetry pipelines, and security analytics use cases
• Experience with internal penetration testing or adversarial exercises, and translating results into detection and remediation work
• Strong understanding of cloud-native security controls, including IAM, network segmentation, and container security
• Experience with container and dependency security tools (e.g., Snyk, Trivy, Grype) as an operator of their findings
• Experience aligning technical security work with regulatory and compliance expectations
• Experience in fintech, payments, or other regulated environments

Details

• Location: Türkiye, Remote
• Employment type: Full-time
• Reports to the Director of Information Security
• Compensation: $5,000 - $9,500 USD per month, gross, based on experience level