Senior Communications Systems & Offensive Security Engineer

CyberJobs.Com; Alexandria (VA); On-site; USD 140,000 - 170,000; Full time

Job summary

Parry Labs is seeking an experienced security engineer to lead authorized offensive assessments of software, networks and distributed mission systems. You will identify vulnerabilities, demonstrate impact and collaborate with engineers to verify fixes under the direction of the Chief Engineer.

The role starts in November 2026 with responsibilities spanning threat modeling, testing, fuzzing, code review and secure remediation collaboration across teams.

Qualifications

• Bachelor's degree or equivalent experience in cybersecurity/computer science/engineering.
• 7+ years of security engineering experience with offensive testing or vulnerability research.
• Experience with authorized penetration testing, protocol analysis, fuzzing and vulnerability assessment.
• Ability to review Rust or C/C++ and develop security test tooling in Python or a systems language.
• Experience analyzing Linux and network behavior (TCP/IP, services, access controls).
• Experience producing reproducible findings and validating remediation with engineering teams.
• U.S. citizenship and eligibility for a U.S. government security clearance if required.

Responsibilities

• Develop threat models and security test plans linked to system requirements and potential failure modes.
• Define authorized test scope, rules of engagement and stop conditions with stakeholders.
• Conduct penetration testing, protocol analysis and vulnerability research in approved test environments.
• Build protocol and parser fuzzing tools and add repeatable security checks to automated test workflows.
• Assess Linux services and network interfaces; review Rust or C/C++ code for security weaknesses.
• Evaluate authentication, digital signatures, replay protection and key handling with engineers.
• Document reproducible findings, impact and remediation priorities; retest fixes and preserve evidence.
• Support red-team and blue-team exercises; maintain independence of assessment signoff.

Skills

Security engineering

Penetration testing

Vulnerability research

Python scripting

Rust review

C/C++ review

Linux networking

DoD testing

Education

Bachelor's degree in cybersecurity, computer science, engineering or related field

Tools

Python

Rust

C/C++

Job description

Parry Labs is seeking an experienced security engineer to lead authorized offensive assessments of software, networks and distributed mission systems. You will identify vulnerabilities, demonstrate impact and collaborate with engineers to verify fixes under the direction of the Chief Engineer.

The role starts in November 2026 with responsibilities spanning threat modeling, testing, fuzzing, code review and secure remediation collaboration across teams.