Application Security Engineer — Secure Mission Systems

Location: Mainly remote, with onsite work in Laurel, Maryland, typically one day approximately every six weeks for team-wide sprint planning
Clearance: Active final DoD Secret clearance required

This position supports a pending contract opportunity and is contingent upon contract award, with an anticipated start in November 2026.

Build Security into Mission-Critical Software

At Rackner, you will help strengthen secure software supporting high-impact Department of Defense planning and decision-support missions.

This is a hands-on application-security role where you can influence how security is built into software from development through release. You will work closely with software engineers, AI/ML engineers, platform teams, DevSecOps professionals, and customer technical leads to identify meaningful risks, support vulnerability remediation, and strengthen secure-development practices.

Your work will go beyond running scanners or delivering reports. You will help teams understand security findings, separate actionable risks from false positives, verify fixes, improve software supply-chain security, and deliver resilient software with greater confidence.

You will:

• Integrate application-security testing throughout the software-development lifecycle.
• Conduct and support static application-security testing using Fortify.
• Conduct and support dynamic application-security testing using OWASP ZAP.
• Support software-composition analysis and software supply-chain security using JFrog Xray.
• Review and triage security findings, identify actionable vulnerabilities, and distinguish meaningful risks from false positives.
• Work directly with software engineers to understand root causes, support remediation, and verify completed fixes.
• Integrate automated security scanning into secure CI/CD and GitLab-based development workflows.
• Strengthen dependency-management and software supply-chain controls throughout development and delivery.
• Support application security within environments using GitLab, Artifactory, OpenShift, and Kubernetes.
• Contribute to technical reviews, code reviews, software testing, and security-remediation activities.
• Produce clear vulnerability findings, remediation reports, code-review observations, and technical documentation.
• Support verification that software meets applicable functional, coding, and security requirements before release.
• Collaborate with software, AI/ML, platform, DevSecOps, and customer technical teams.

What You’ll Bring

• Bachelor’s degree in Cybersecurity.
• At least six years of experience involving cyber resilience, SAST, DAST, and software-vulnerability remediation.
• Hands-on experience with Fortify, JFrog Xray, and OWASP ZAP.
• Identifying, evaluating, triaging, and supporting remediation of application-security vulnerabilities.
• Working directly with software-development teams to resolve security findings.
• Experience with software supply-chain security, dependency risk, or software-composition analysis.
• Understanding of secure software-development lifecycle practices.
• Integrating automated security scanning into software-development or CI/CD workflows.
• Ability to clearly document technical findings and communicate them to developers and technical stakeholders.

Experience That Can Strengthen Your Fit

Experience with several of the following can improve alignment:

• GitLab-based development and CI/CD workflows.
• Artifactory or similar artifact-management platforms.
• OpenShift, Kubernetes, and containerized application environments.
• Additional SAST, DAST, dependency-scanning, or software-composition-analysis tools.
• Secure-code review and remediation verification.
• Application-security testing in disconnected, restricted, or customer-managed environments.
• Supporting classified, defense, aerospace, government, or other regulated software environments.
• Collaboration across application security, software engineering, platform, DevSecOps, and AI/ML teams.

You do not need equal depth in every area, but your background should include direct experience with the named application-security tools and workflows.

Why Rackner

At Rackner, you will have the opportunity to protect technology supporting critical defense and public-sector missions.

You will work on more than isolated scan execution or vulnerability reports. This role combines hands-on application-security testing, vulnerability analysis, remediation verification, software supply-chain security, and close collaboration across software, AI/ML, platform, and mission-focused teams.

Rackner has delivered more than $30 million in recent federal awards and supports mission-critical work across defense, civilian, and public-sector environments. We are looking for an application-security engineer who can build on that momentum by strengthening secure delivery, helping teams resolve vulnerabilities, and improving confidence in the software reaching mission users.

Benefits & Professional Growth

• Competitive compensation
• Company-supported certifications aligned with current and future program work
• 401(k) with 100% company match up to 6%
• Medical, dental, vision, life, and disability coverage
• Paid time off and company holidays
• Remote-work support and home-office equipment plan
• Fitness and wellness reimbursement
• Weekly pay schedule
• Professional-development and future growth opportunities

Apply

If you are an application-security professional who wants broader influence across secure development, automated security testing, vulnerability remediation, and software supply-chain security, we would like to hear from you.