Mantech

Currently, ManTech is seeking a motivated, career and customer-oriented Senior Systems Engineer to join our team supporting a large U. S. Government program within the National Capitol Region.
 

Responsibilities include, but are not limited to:

• Submit change requests and troubleshoot as requested by components, the Security Operations Center (SOC), and others: forward proxy, reverse proxy, DNS, SSLV, and firewall requests to the Telecommunications provider for the WAN.
• Manage high-volume (more than 1M messages per day) SMTP relays.
• Manage the Proofpoint mail security system. Also diagnose mail delivery issues through several layers of security.
• Monitor and manage mail routing using an LDAP directory.
• Diagnose user connectivity issues using logs.
• Monitor and manage Infoblox DNS system as well as general BIND/DNS functionality.
• Configure and utilize the Xymon monitoring system to evaluate any potential issues and investigate any problems. 
• Perform Dynatrace and SNMP-based monitoring.
• Maintain archival logging for network systems.
• Implement a Zscaler Zero Trust solution for TIC 3.0 deployment.
• Manage IP Address allocations with IPAM
• Administer and manage Unix/Linux operating systems.
• Manage and monitor Zscaler environment; Deploy and maintain Zscaler related physical and virtual machines to include but not limited to: ZPA connectors; LSS connectors; NSS systems; Private Service Edges (ZPA & ZIA)

Basic Qualifications:

• A bachelor’s degree in computer science or management information systems or equivalent discipline
• A minimum of (7) seven years of IT experience and must have 4 years experience supporting networks and network security solutions and tools.
• Hands on experience using tools / technologies such as: Zscaler, Inflobox, Dynatrace, ProofPoint, Cisco, Xymon, MS IPAM and Unix/Linux.
• Direct experience configuring and troubleshooting forward and reverse proxies and network firewalls
• Experience with the design, installation, maintenance, and coordination of the use of aTIC
• Experience evaluating complex hardware and software and peripheral equipment for large, complex networks.
• Proven experience managing network performance.
• Experience troubleshooting and resolving complex problems to ensure quality transmission service on the network.
• Experience managing, maintaining, creating, and deleting user accounts as well as maintaining and updating system security plans on all platforms.
• Proven experience implementing and managing network policies, procedures, and standards.

Security Clearance Requirements:

• Must be a U.S. citizen
• Must possess and maintain an active Top-Secret clearance

Physical Requirements:

• Must be able to be in a stationary position more than 50% of the time 
• Must be able to communicate, converse, and exchange information with peers and senior personnel 
• Constantly operates a computer and other office productivity machinery, such as a computer 
• The person in this position frequently communicates with co-workers, management, and customers, which may involve delivering presentations. Must be able to exchange accurate information in these situations 
• The person in this position needs to occasionally move about inside the office to access file cabinets, office machinery, etc.