Senior Security Engineer

ECS is seeking a Senior Security Engineer to work in our Arlington, VA (hybrid) office. We are looking for a talented Senior Security Engineer who is passionate about building, securing, and improving modern technology environments. Strong candidates will have deep hands-on experience across security engineering, cloud, Linux, networking, automation, and application security, with a desire to learn and work with emerging technologies. This is a hands-on engineering role , not a compliance-focused ISSO position. The ideal candidate will be comfortable designing and implementing security controls, writing automation and tooling, troubleshooting complex technical issues, and partnering directly with engineering teams to build secure and resilient systems. Responsibilities Design, build, implement, and maintain security solutions across cloud, application, infrastructure, and containerized environments. Identify vulnerabilities, attack paths, configuration weaknesses, and security gaps, and develop practical engineering solutions to remediate them. Build and maintain security automation, tooling, scripts, and integrations using languages such as Python, Go, PowerShell, or Bash. Engineer security controls for Linux systems, networks, cloud platforms, containers, Kubernetes, applications, and supporting infrastructure. Develop and improve security monitoring, logging, detection, and response capabilities using system, application, network, and cloud telemetry. Implement security into CI/CD pipelines, infrastructure-as-code workflows, and software development processes. Partner with developers, DevOps engineers, cloud engineers, and system administrators to design solutions that are secure, scalable, maintainable, and operationally effective. Perform hands-on security testing, technical assessments, configuration reviews, and troubleshooting of complex systems and applications. Develop security tooling and integrations using APIs, automation frameworks, and native cloud services. Secure microservices, APIs, containers, and distributed application architectures. Harden operating systems, network services, cloud resources, and application platforms using security engineering best practices. Analyze security data and metrics to identify trends, prioritize risk, and drive improvements to the security posture of the environment. Research emerging threats, vulnerabilities, attack techniques, and security technologies and determine how they apply to the environment. Provide technical leadership and mentorship while remaining actively involved in engineering and implementation work. Salary Range: $140,000-$180,000 General Description of Benefit Bachelor's degree in engineering, computer science, cybersecurity, or another technical discipline, or an associate degree with equivalent years of relevant technical experience. At least 8 years of overall technical experience , including significant hands-on experience in several of the following areas: Security Engineering Unix/Linux Administration and Security Network and Infrastructure Security Cloud Engineering and Cloud Security Application or Software Development Security Automation and Scripting Vulnerability Management and System Hardening Container and Kubernetes Security Security Monitoring, Detection, and Incident Response Strong scripting or development experience in at least one language such as Python, Go, PowerShell, Bash, Perl, or similar . Demonstrated ability to independently troubleshoot complex technical and security problems and implement solutions. Ability to work directly with engineering teams and translate security requirements into practical technical controls. Must successfully complete a stringent Background Investigation and obtain the required Government Security Clearance. ECS Limited