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Application Security Engineer

Job in O'Fallon, St. Charles County, Missouri, 63366, USA
Listing for: CACI International
Full Time position
Listed on 2026-10-11
Job specializations:
  • IT/Tech
    Cybersecurity
Salary/Wage Range or Industry Benchmark: 75000 - 158000 USD Yearly USD 75000.00 158000.00 YEAR
Job Description & How to Apply Below

Job Title:

Application Security Engineer

Job Category:
Information Technology

Time Type:
Full time

Minimum Clearance Required to Start:
Secret

Employee Type:
Regular

Percentage of

Travel Required:

Up to 10%

Type of Travel:
Local

* * *

The Opportunity

Join a mission‑driven cybersecurity team securing applications that support a critical DoD mission
. In this role, you’ll embed security directly into the software development lifecycle, partner with developers and architects, and use industry‑leading tools to identify, validate, and remediate vulnerabilities across a diverse application ecosystem.

You will
  • Embed robust security practices into the secure SDLC from design through deployment
  • Execute both static (SAST) and dynamic (DAST) application security testing using enterprise tooling
  • Lead and support penetration testing engagements, guiding developers through actionable remediation
  • Work within a fully staffed cybersecurity program—including architecture, GRC, and operations experts
  • Grow your expertise across the App Sec spectrum: code review, runtime testing, and compliance validation
Responsibilities
  • Perform SAST using Fortify across assigned applications
  • Conduct continuous code quality and security analysis using Sonar Qube
  • Execute DAST to identify runtime vulnerabilities
  • Coordinate and execute penetration testing engagements
  • Conduct secure code reviews and document findings with actionable guidance
  • Track and verify vulnerability remediation through closure
  • Validate application security controls against program and DoD requirements
  • Author application security assessment and penetration test reports
  • Support the Cybersecurity Architect with secure SDLC process design
Qualifications
  • Active Secret or TS clearance
  • 3–5 years of experience in application security, secure development, or penetration testing
  • Hands‑on experience with SAST platforms (Fortify preferred)
  • Working knowledge of OWASP Top 10 and common application vulnerability classes
  • Demonstrated experience conducting or supporting penetration tests
  • DoD 8140.03M DCWF Basic Tier — CEH
  • DoD 8140 Interim Education Options
    Required to travel to Scott Airforce base on a quarterly basis
Desired
  • DoD 8140.03M DCWF Intermediate Tier — one of: CEH(P), RCCE Level 1, Cloud+, CPTE, FITSP‑A, GCED, GCIH, GCSA, GICSP, GSEC, Pen Test+, or Security+
  • Bachelor’s degree in Computer Science, Cybersecurity, Data Science, Information Systems, IT, or Software Engineering
  • Experience with Sonar Qube or similar secure code analysis platforms
  • Familiarity with Dev Sec Ops pipelines and CI/CD security integration
  • Scripting or development experience in Python, Java, or similar languages
What You Can Expect A culture of integrity

At CACI, we place character and innovation at the center of everything we do. As a valued team member, you’ll be part of a high-performing group dedicated to our customer’s missions and driven by a higher purpose – to ensure the safety of our nation.

An environment of trust

CACI values the unique contributions that every employee brings to our company and our customers - every day. You’ll have the autonomy to take the time you need through a unique flexible time off benefit and have access to robust learning resources to make your ambitions a reality.

A focus on continuous growth

Together, we will advance our nation's most critical missions, build on our lengthy track record of business success, and find opportunities to break new ground — in your career and in our legacy.

Pay Range

There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. Our employees value the…

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