The Arena is hiring: Cybersecurity Engineer - Senior with Security Clearance in

Cybersecurity Engineer – Senior Location: Onsite | Washington, DC Clearance: Employment Type: Full-time, salaried, with full benefits ________________________________________________________________________________ About the Company: Our customer is a mission-driven technology company transforming how the U.S. defense and intelligence community leverages artificial intelligence. The company integrates cutting-edge AI, next-generation sensors, and advanced data solutions into operational environments—delivering capabilities that matter at the speed of mission. The problems they tackle are complex and high impact: accelerating decision-making, enhancing warfighter effectiveness, and shaping the future of defense technology. ________________________________________________________________________________ About the Role: The Senior Cybersecurity Engineer will lead the design, implementation, and continuous hardening of cybersecurity architectures for AI/ML systems deployed across classified networks, including JWICS. This role requires balancing robust security protections with mission effectiveness—ensuring AI-enabled solutions remain resilient, compliant, and trusted in operational environments. Design and implement security architectures for AI/ML systems in classified environments • Conduct security assessments and penetration testing of AI applications • Develop security policies and procedures specific to AI/ML workloads • Lead incident response activities and forensic analysis for AI system compromises • Implement advanced threat detection and monitoring solutions • Mentor junior cybersecurity personnel and provide technical guidance • Coordinate with stakeholders on security requirements and risk assessments ________________________________________________________________________________ Typically 10+ years of cybersecurity experience, preferably within DoD/IC environments. • Deep knowledge of network security, cryptography, and secure coding practices. • Experience with SIEM, vulnerability scanners, and penetration testing toolsets. • Understanding of AI/ML security considerations, including adversarial threats. • Hands-on experience securing cloud environments (AWS preferred). • Background in securing distributed systems, containerized workloads, and real-time data platforms. • Familiarity with Responsible AI frameworks and model security practices. • Benefits: • Equity participation • 401(k) retirement plan • Paid holidays • Comprehensive medical, dental, vision, and life insurance • Short- and long-term disability coverage