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Senior Systems Engineer

2 months ago


Washington, Washington, D.C., United States ManTech Full time
Secure Our Nation, Ignite Your Future

Become an integral part of a diverse team at ManTech International, where our employees come first.

As a Senior Systems Engineer, you'll help protect our national security while working on innovative projects that offer opportunities for advancement.

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

Key Responsibilities:
  • Submit change requests and troubleshoot as requested by components, the Justice Security Operations Center (JSOC), and others: forward proxy, reverse proxy, DNS, SSLV, and firewall requests to AT&T via Business Direct for implementation by AT&T.
  • Manage high-volume (more than 1M messages per day) SMTP relays.
  • Manage the Proofpoint mail security system.
  • Diagnose mail delivery issues through several layers of security.
  • Monitor and manage mail routing using an LDAP directory.
  • Diagnose user connectivity issues using logs.
  • Work with partner entities providing in-depth IT investigations.
  • Work with partner entities modifying policies on IT systems.
  • Monitor and manage Infoblox DNS system as well as general BIND/DNS functionality.
  • Utilize the Xymon monitoring system to evaluate any potential issues and investigate any problems.
  • Configure Xymon and creating new monitoring modules.
  • 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.
Basic Qualifications:
  • Experience with Zscaler Zero Trust.
  • A bachelor's degree in computer science or management information systems or equivalent discipline.
  • A minimum of (7) seven years of experience in a related technical environment.
  • Direct experience configuring and troubleshooting forward and reverse proxies and network firewalls.
  • Experience with the design, installation, maintenance, and coordination of the use of the network system.
  • 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 have 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.