Full job description
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:
What You’ll Bring
Experience That Can Strengthen Your Fit
Experience with several of the following can improve alignment:
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
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.