Cyber Security Engineer

About the Role DevNull Security is seeking a hands-on Cyber Engineer with good coverage across PKI, Palo Alto, Cortex XDR, Cortex Cloud, Cortex ASM, SIEM, SailPoint, Delinea and ServiceNow GRC to help secure and strengthen a complex enterprise environment. We need someone with strong breadth across this stack and the ability to get into the detail and remediate issues. This is a highly technical, engineering-focused role for someone who enjoys getting stuck in, solving problems and improving security outcomes. What You’ll Be Doing - Engineering, supporting and improving security tooling across PKI, network security, endpoint, cloud, identity and GRC platforms. - Managing and troubleshooting PKI services, including certificate issuance, renewal and lifecycle management. - Configuring and supporting Palo Alto firewalls and network security controls. - Deploying, tuning and supporting Cortex XDR, Cortex Cloud and Cortex ASM to improve detection, cloud posture and attack surface visibility. - Supporting SIEM onboarding, log source integration, use case tuning and data quality improvements. - Supporting identity and privileged access engineering using SailPoint and Delinea, including onboarding, integrations and access remediation. - Working with ServiceNow GRC to support risk, control and compliance workflows. - Investigating and remediating security issues, misconfigurations and vulnerabilities across the stack. - Collaborating with security, infrastructure, cloud and risk teams to deliver practical, well-documented solutions. Key Skills & Experience - Hands-on cyber security engineering experience with strong breadth across a multi-vendor security stack. - Ability to get into the detail, troubleshoot complex issues and drive remediation through to completion. Practical experience across several of the following (depth in every area is not expected): - PKI – certificate authorities, certificate lifecycle and troubleshooting. - Palo Alto – firewalls and network security policy. - Cortex XDR, Cortex Cloud and Cortex ASM. - SIEM – log onboarding, integrations, detection and tuning. - SailPoint – identity governance and administration. - Delinea – privileged access management. - ServiceNow GRC – risk, controls and compliance. - Strong understanding of security architecture, risk and security best practice. - Experience working in large-scale or regulated environments. - Clear communication and the ability to work with technical and non-technical stakeholders. Nice to Have - Relevant certifications, such as PCNSE, Security+, CISSP, or vendor certifications for SailPoint, Delinea or ServiceNow. - Scripting or automation experience (e.g. Python, PowerShell, APIs). - Cloud security exposure (AWS / Azure / GCP). Why Apply? - Work with a broad, modern enterprise security stack. - Deliver high-impact engineering work and see the results of your improvements. - Develop depth across multiple technologies with the support of an experienced team. Working at DevNull Security While DevNull Security is a remote-first company, our consulting team may be required to travel to client sites 1–3 times per week, depending on project and customer needs. We believe that a career in cybersecurity should be accessible to everyone. We actively welcome applicants from all walks of life, regardless of race, ethnicity, gender identity, age, sexual orientation, disability, neurodiversity, socioeconomic background, or any other aspect of identity. As a growing company, we’re committed to fostering an inclusive, equitable, and accessible hiring experience. We proactively offer adjustments during application and assessment - tell us what you need.