**ManTech** is seeking a motivated, career and customer-oriented **Senior Network Engineer** to join our team in the **Reston or Chantilly, VA** location. This is an **onsite** position. The successful candidate will work with Network and Systems Engineers to design, build, monitor, maintain, and upgrade all program networks to ensure data is consistently available and flowing properly. **Responsibilities include but are not limited to:** + Designing, building, monitoring, maintaining, and upgrading all program networks and communications links + Analyzing networks and communications links to identify and resolve architecture, provider, environment, or other issues + Implementing and maintaining effective tools to evaluate/analyze data movement and ensure data integrity throughout the network + Working with engineering teams to troubleshoot integration issues and to maximize network and system performance + Establishing appropriate network monitoring and early warning mechanisms to proactively identify potential issues before they impact operations + Monitoring and evaluating network performance and recommending improvements + Performing performance testing and tuning for all network and Cloud infrastructures + Working with engineering teams to resolve reported problems + Interfacing with third party vendors for monitoring, troubleshooting, tracking, and reporting metrics + Preparing and presenting briefings to the Sponsor as required **Basic Qualifications:** + Ten (10)+ years of relevant experience serving as a Network Engineer or performing similar technical duties + Strong experience with network hardware configuration and maintenance in large-scale environments + Strong experience with relevant networking and firewall technologies such as Cisco and Palo Alto + Strong network administration experience in areas such as DNS, routing, firewall configuration, scripting and automation + Strong Cloud experience, including remote management, with technologies such as AWS + Strong experience performing Tier 2-4 network troubleshooting and resolving issues **Preferred Qualifications:** + Prior experience managing and maintaining complex networks used to transport data worldwide + Ability and willingness to travel overseas if required **Clearance Requirements:** + Must have an active/current **TS/SCI w/ polygraph.** **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.