Sr. Network Design Engineer - Access

Leidos has an opening for a Sr. Network Design Engineer (Access) to support the customer’s various WAN and LAN networks, in providing network design, upgrades and config support to the architecture team; act as subject matter expert in WAN and LAN technologies and vendors; support customer’s intra- and inter- net and other data communications systems or segments of networked system; and by Providing tiered support as required.

The job duties are as follows:

• Design and improve overall MPLS network architecture and network services.  Maintain relevant technical documentation. 
• Develop secure network designs including configurations that align with Defense Information Security Agency (DISA) Security Technical Implementation Guides (STIGs) and enterprise policies. Obtain Authority to Operate (ATO) for new devices, software, and capabilities.
• Perform lab equipment, software, application, and network services solution evaluation, testing, integration with NMS, and security certification.
• Evaluate new network technologies, solution, and services.
• Interpret customer requirements and apply industry standard design approaches for service delivery. Fully document designs with diagrams, bill of materials, cabling sheets, configurations, ability to brief designs
• Provide technical expertise to Operations engineers and technicians, supporting fault isolation and resolution. Solve tough problems with innovative and scalable solutions.
• Configuring and troubleshooting Quality of Service (QoS) and traffic optimization to maximize bandwidth usage.
• Support Tier-4 production troubleshooting and develop pro-active network analysis solution of Operation team. 
• Leverage complex network analysis tools to identify and predict problems in the network and aid in the post-mortem analysis of network anomalies.

Requirements

• Required Clearance: TS/SCI with Poly
• Candidate must have 16 years of experience that can be a combination of work history and education. This equates to a Doctorate and 8 years, master’s and 10 years, bachelor’s and 12 years, associates and 14 years or HS diploma and 16 years.
• Must be compliant with DoD 8140 Information Assurance Technical (IAT) Level 2.
• Juniper certification or training: JNCIA, JNCIP, and JNCIE. 
• Experience in developing and implementing methodologies for analysis, testing, and support of CAN/LAN and WAN networks.
• Familiar with firewalls and network timing.
• Experience with network equipment and solution rolls out, as well as engineering documentation
• Experience with operations and maintenance activities of MPLS networks, MPLS VPN services.
• Experience using complex network analysis tools to identify and correct problems in the network while maintaining logs and records associated with reported problems or situations.
• Knowledge of routing and switching protocols and the ability to demonstrate knowledge through briefings and documentation. Extensive BGP experience a plus.

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares.

Original Posting:

September 17, 2026

Pay Range:

Pay Range $92,300.00 - $166,850.00

The Leidos pay range for this job level is a general guideline only and 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.