Sr. Network Engineer

Job Description Leidos is seeking a Sr. Network Engineer to join our Defense Enclave Services (DES) team at F ** t. Meade, MD.** The DES program is a highly demanding mission and requires expert technical and professional management to support DISA’s enterprise Information Technology (IT) services. You will be supporting a large and complex IT discovery, design, and migration effort aimed at consolidating Department of Defense (DOD) IT services into single service provider model. This role will include discovery, analysis, design, and network migration activities necessary to move a host of DoD agencies into the modernized DoDNet environment. Primary Responsibilities: Plan and design secure network solutions to consolidate connectivity services under an enterprise service. Partner with key stakeholders and technical experts to perform legacy environment discovery, assessing current capabilities, configurations, and unique requirements to develop a design and architecture leveraging approved design patterns. Design secure wide area connectivity inclusive of underlay, overlay, and COI transport design that supports performance, quality of service, security, and mission requirements. Provide secure access solutions leveraging wired and wireless technologies, integrating standards, use cases/scenarios, and develop associated implementation and transition plans. Integrate capacity planning and scaling of network and security stack environments into the overall design of solutions. Collect, investigate, and identify network optimization strategies and techniques to meet capacity and performance standards. Identify legacy service paths (i.e. dataflow, firewall rulesets, and ACLs) and develop strategies and designs for the to-be enterprise service capability to meet requirements while balancing security, sustainability, and maintainability. Support development of IP addressing schemes across IPv4 and IPv6 networks. Work with information assurance teams to ensure compliance to DoD standards to assist with providing accreditation artifacts. CLEARANCE REQUIREMENT: Must hold an active Secret security clearance prior to start and be able to obtain a Top Secret. (US Citizenship required) Basic Qualifications: Bachelor’s degree and 8+ years of prior relevant experience. Specific experience, education and training may be considered in lieu of degree. Active DoD Secret clearance Require active DoD IAT Level II (i.e. Security+) certification or equivalent prior to start. Experience documenting logical or physical designs using drawing tools (e.g. Visio, Powerpoint, Gliffy, Cameo, MagicDraw) to depict systems, subsystems, interfaces, components, and communications of I/T applications and infrastructure Experienced and comfortable with conducting technical troubleshooting to resolve issues. Experience conducting site surveys or analyzing data obtained from site surveys. Experience creating or executing a migration plan to move circuits, network traffic, services, applications, or data between environments or to a commercial cloud provider. Alternatively, experience planning or executing a technology refresh or lifecycle refresh of an existing I/T system. Heavily experienced in upgrading and LCR of network devices. Must have broad exposure to common I/T infrastructure networking in the areas of LAN, WAN, TCP/UDP, IPSec, VPN, Proxies, Routing(L2/L3), and Firewalls. Must have experience in working with two or more of the following vendor network technologies: Cisco, Juniper, F5, Aruba, Palo Alto, Dell, Brocade, and Fortinet. Demonstrated experience in designing and implementing medium to large network infrastructure and producing corresponding technical documentation. Must be able to work as part of a team to troubleshoot and resolve complex network issues. Excellent written and verbal communication skills. This shall include drafting SOPs and technical documentation. Requires ability to communicate with executive leadership (internally or client) regarding matters of significant important to the organization/project. Must be able to present designs and plans to technical leadership personnel and boards for approvals. Preferred Qualifications: Certified Cisco Network Professional (CCNP) or equivalent. Demonstrated experience in one or more of the following enterprise network management tools such as PaloAlto Panorama, SolarWinds, Cisco Prime, Cisco DNA, What’s Up Gold, or Junos Space. Experience in designing and implementing VTC solutions. Experience with ScienceLogic SL1 and/or SolarWinds. Hands on experience with SD-WAN. Demonstrate expertise in design and improvement of complex and geographically enterprise networks. Expert knowledge of DoD security requirements for network infrastructure. Demonstrate experience in system hardening of network infrastructure to include DoD STIG implementation. Original Posting: April 23, 2026 For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above. Pay Range: Pay Range $92,300.00 - $166,850.00 The Leidos pay range for this job level is a general guideline onlyand not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law. #J-18808-Ljbffr