Senior Offensive Security Engineer: Red Team Lead

Koitecc Solutions; Alexandria (VA); Hybrid; USD 130,000 - 190,000; Full time

Benefits offered by this job

Workplace flexibility

Education assistance

Unlimited paid time off

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. The target start is November 2026.

You will conduct threat modeling, penetration testing, fuzzing, and vulnerability research, while reviewing Rust/C/C++ code and building security tooling. U.S. citizenship and clearance eligibility required.

Qualifications

• Bachelor's degree in cybersecurity, CS, engineering or related field or equivalent experience.
• 7+ years in security engineering with 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 and maintain a U.S. government security clearance if required. An active clearance is 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 and 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

Security engineering

Penetration testing

Rust/C/C++ review

Python tooling

Linux networking

Vulnerability assessment

Clearance eligibility

Education

Bachelor's degree

Tools

Fuzzing tools

Protocol analysis tools

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. The target start is November 2026.

You will conduct threat modeling, penetration testing, fuzzing, and vulnerability research, while reviewing Rust/C/C++ code and building security tooling. U.S. citizenship and clearance eligibility required.