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.
