Sr. Security Engineer

Job Description

Purpose and Impact:

Come be a part of an exciting and ever-changing program that provides a comprehensive range of state-of-the-art solutions and hands-on assistance in designing, implementing, managing, and sustaining operations across various network environments for our customer.

We provide an environment that fosters and supports innovation and valuing “outside-the-box” thinking to solve complex problems.  There are several training opportunities for team members that want to learn new technologies and stay current with their technical skillset.  We are a highly technical group and nurture growth, with a technical culture of cross-trained teammates with opportunities to develop additional skillsets.

Work Schedule: 8hrs/day, 5days per week, all onsite. Must be able to support Thursday night patching after hours (starting at 5pm). Occasional travel will be available.

Essential Responsibilities:

The Senior Security Engineer serves as a technical leader responsible for architecting, engineering, and sustaining enterprise‑grade security solutions across complex IT environments. This role is deeply hands‑on and requires the ability to design, build, implement, operate, and optimize security technologies that protect mission‑critical systems. The Senior Security Engineer provides technical direction, mentors junior engineers, and drives security innovation across the organization.

The engineer leads advanced research, evaluation, and integration of emerging security technologies to strengthen the enterprise security posture. They ensure that system hardware, operating systems, software, and security controls adhere to organizational policies, compliance frameworks, and mission objectives.

Key responsibilities include:

• Architect, implement, and maintain enterprise security controls and infrastructure components across Windows, Linux, and virtualized environments

• Lead the design, deployment, configuration, and lifecycle management of endpoint hardening and security tools (e.g., Ivanti, WSUS, Trellix, Tenable)

• Oversee patch management processes, including OS updates, third‑party software updates, and administrative tool upgrades

• Provide expert‑level troubleshooting, root‑cause analysis, and performance optimization for complex security and infrastructure issues

• Evaluate, recommend, and lead the adoption of new security tools, technologies, and methodologies

• Develop and maintain security documentation, including SSPs, RMF artifacts, engineering diagrams, and operational procedures

• Design and implement security requirements within enterprise business processes and technical architectures

• Support vulnerability assessments, interpret results, and develop risk‑based mitigation strategies

• Conduct system hardening, configuration baselining, and compliance scanning to ensure adherence to security standards

• Support and guide incident response activities, including forensic analysis and containment strategies

• Collaborate with cross‑functional teams to ensure security is embedded throughout system lifecycles

• Mentor and provide technical leadership to junior and mid‑level security engineers

• Contribute to long‑term security strategy, capability development, and continuous improvement initiatives

• Support a diverse set of enterprise networks and mission environments as part of a high‑performing security engineering team

Work Environment, Physical Demands, and Mental Demands: Standard work environment

Other Responsibilities:

Safety - Amentum enforces a safety culture whereby all employees have the responsibility for continuously developing and maintaining a safe work environment. As appropriate, each employee is responsible for completing all training requirements and fulfilling all self-aid/buddy aid responsibilities, participating in emergency response tasks and serving on safety committees and teams.

Quality - Quality is the foundation for the management of our business and the keystone to our goal of customer satisfaction. It is our policy to consistently provide services that meet customer expectations. Accordingly, each employee must conform to the Amentum Quality Policy and carry out job activities in compliance with applicable Amentum Quality System documents and customer contracts. Each employee must read and understand his/her Quality Management and Customer Satisfaction responsibilities.

Procedure Compliance - Each employee must read, understand and implement the general and specific operational, safety, quality and environmental requirements of all plans, procedures and policies pe