Senior Offensive Cybersecurity Engineer: Lead Red Team Testing

Parry Labs, LLC; Dallas (TX); On-site; USD 140,000 - 190,000; Full time

Job summary

Parry Labs in Alexandria, VA, seeks a Senior Offensive Cybersecurity Engineer to lead authorized security assessments of software and mission systems. You will identify vulnerabilities, demonstrate impact, and coordinate fixes with engineers. Start is planned for November 2026.

You will develop threat models, conduct penetration testing, review Rust/C++ code, and build security tooling. A strong background in Linux networking and cryptography is required.

Qualifications

• Bachelor's degree in cybersecurity, computer science, engineering or related field, or equivalent experience.
• 7+ years of security engineering experience including hands-on 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, including TCP/IP, service configuration and access controls.
• Experience producing reproducible findings, explaining security impact and verifying remediation with engineering teams.
• U.S. citizenship and eligibility to obtain/maintain a U.S. government security clearance if required (active clearance not required at hire).

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 program stakeholders.
• Conduct penetration testing, protocol analysis and vulnerability research in approved test environments.
• Build protocol and parser fuzzing tools; 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 software/cryptographic engineers.
• Document reproducible findings, impact and remediation priorities; retest fixes and preserve test evidence.
• Support red-team and blue-team exercises; keep assessment signoff separate from implementation ownership.

Skills

Offensive security testing

Vulnerability research

Penetration testing

Python

Rust

C/C++

Linux networking

Security tooling

Education

Bachelor's degree or equivalent experience

Tools

Python

Rust

C/C++

Job description

Parry Labs in Alexandria, VA, seeks a Senior Offensive Cybersecurity Engineer to lead authorized security assessments of software and mission systems. You will identify vulnerabilities, demonstrate impact, and coordinate fixes with engineers. Start is planned for November 2026.

You will develop threat models, conduct penetration testing, review Rust/C++ code, and build security tooling. A strong background in Linux networking and cryptography is required.