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Security Software Engineer/Penetration Tester - Clearance Required

Cydecor, Inc.

Salary not specified
Nov 13, 2025
Crystal City, VA, US
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Cydecor is seeking a Security Software Engineer/Penetration Tester to support advanced cybersecurity and software assurance efforts for U.S. Department of Defense (DoD) systems.

Requirements

  • Five (5) years of software engineering experience supporting program development or modeling and simulation for DoD or IT systems.
  • Five (5) years of Linux experience, demonstrating firm command-line and system administration skills.
  • Five (5) years of Windows experience with solid understanding of enterprise network environments.
  • Strong working knowledge of common Penetration Testing (PENTEST) tools: Kali, Metasploit, NMAP, Cobalt Strike
  • Documented experience in at least one of the following areas: Penetration Testing (PENTEST) (government or contractor), Red Team Operations (government or contractor), Tool/Software Development (exploits/malware, C2, reverse engineering, bug bounties)
  • Python, C, C Sharp, C++, Go, Perl, Powershell
  • NSX, vCenter, vRealize Suite, Horizon View (VDI) and others

Responsibilities

  • Debug and reverse engineer software to identify vulnerabilities and optimize security performance.
  • Analyze Windows Event logs, Linux syslogs, boot logs, and dmesg logs to identify anomalies and security concerns.
  • Program and debug software using Web 2.0, Java, Perl, Ada, C++, and Tool Command Language (Tcl/Tk) scripts, including GUIs and configuration management tools such as Microsoft Visual Studio and Rational ClearCase.
  • Recommend and implement software modifications to mitigate known vulnerabilities.
  • Administer systems running HP-UX, UNIX, Solaris, Linux, and Microsoft Windows operating systems.
  • Identify and remediate security flaws in both compiled and human-readable source code.
  • Understand and work with real-time operating systems (VxWorks, LynxOS), CORBA, firewalls, and networking protocols.

Other

  • Active Top Secret clearance with SCI eligibility.
  • Minimum IAT Level II certification per DoD 8570.01 (or successor).
  • Minimum penetration testing certification, holding at least one of the following: Offensive Security Certifications: OSCP, OSCE, OSEE, OSWP, SANS Certifications: GPEN, GWAPT, GXPN, or equivalent Red Team / Penetration Testing certifications
  • Strong understanding of computer security principles, military system specifications, and DoD Cybersecurity policies for both land-based and afloat/tactical systems.
  • Ability to communicate effectively and succinctly in both written and verbal formats.