Currently, ManTech is seeking a motivated, career and customer-oriented **Senior Network Engineer** to join our team in Fairfax, VA. **Responsibilities include, but are not limited to:** + Provide engineering and operational support to multiple cloud instances, with data flows crossing various controlled interfaces, and will follow specific IT project management and engineering lifecycle processes. + Play an integral role in the management and expansion of a classified Platform-as-a-Solution (PaaS) environment, including designing and implementing multiple new network connections into the environment. + Install, configure, and maintain Cisco virtual appliances on cloud infrastructure. Including VPN tunneling, RADIUS user authentication, Clientless VPN configuration. + Configure, maintain, and troubleshoot network components including but not limited to: DNS, firewalls, routing tables, access control lists, subnets, virtual instances. + Develop Ansible playbooks and roles used to automate deployment and configuration management of Linux and Windows servers, Cisco virtual network appliances, and Cloud Service Provider services. **Basic Qualifications:** + Master’s degree (in Computer Science, Engineering, or Math) or equivalent, and 10 years of related Network Engineering experience. + Cybersecurity Requirements: IAT Level 2 Certification or above. + Must maintain a Computing Environment certification for the applicable Operating System (i.e. Microsoft Server 2012 or Database SQL). + Must work in high-visibility or mission critical aspects of a given program and performs all functional duties independently. + Must be able to oversee the efforts of less senior staff and/or be responsible for efforts of all staff assigned to a specific job. **Preferred Qualifications:** + Cloud Computing Certification such as but not limited to; CCNA Cloud, MCSE Cloud Platform, Professional Cloud Network Engineer + Active operating system certification, such as Microsoft, Linux, VMware, etc. + Hands on experience with VLAN routing. + Hands on experience with Brocade, Juniper, Palo Alto, and CISCO switch / networking experience. **Security Clearance Requirements:** + Must have an active TS/SCI **Physical Requirements:** + May be asked to occasionally move about inside the office to access file cabinets, office machinery, etc. + May be asked to move Audio/Visual or Computer equipment weighing up to 50 pounds across and/or around a business campus or large facility. ManTech International Corporation, as well as its subsidiaries proactively fulfills its role as an equal opportunity employer. We do not discriminate against any employee or applicant for employment. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran. If you are a qualified individual with a disability and require a reasonable accommodation to apply for a position with ManTech through its online applicant system, please email us at careers@mantech.com and provide your name and contact information.