Lead Network Software Engineer

Leidos has a new and exciting opportunity for a Lead Network Software Engineer in our National Security Sector's (NSS) Cyber & Analytics Business Area (CABA). Our talented team is at the forefront in Security Engineering, Computer Network Operations (CNO), Mission Software, Analytical Methods and Modeling, Signals Intelligence (SIGINT), and Cryptographic Key Management. At Leidos, we offer competitive benefits, including Paid Time Off, 11 paid Holidays, 401K with a 6% company match and immediate vesting, Flexible Schedules, Discounted Stock Purchase Plans, Technical Upskilling, Education and Training Support, Parental Paid Leave, and much more. Join us and make a difference in National Security! The Lead will support DARPA QuANET and the position builds on building and testing software that integrates network emulation, routing, telemetry, and cyber‑response logic. The developer will work hands‑on with Python and C++, create reproducible test environments, debug Linux and container networking issues, and collaborate with senior engineers across hardware, cyber, and networking teams. Strong systems and distributed‑networking skills are essential; quantum‑domain experience is not required. Candidates with deep implementation ability and broad networking expertise are preferred. Primary Responsibilities: Lead the design and execution of routing, network emulation, telemetry, and network-response capabilities for the program. Translate open-ended R&D objectives into concrete technical plans, experiments, software tasks, and integration milestones. Own container-to-routing-protocol integration in the team's network emulation environment. Guide implementation in Python and C++, including design review, pull request review, and technical debugging. Build and maintain scalable network simulation or emulation environments for large virtual topologies. Integrate distributed telemetry and cross-component state data into routing and network response decisions. Establish reproducible CI/CD, regression testing, and experiment validation workflows for network code. Coordinate standing technical co-design with adjacent teams so interfaces, assumptions, and dependencies remain explicit. Represent technical decisions in customer, PI, advisor, and program-management discussions with evidence-based reasoning. Communicate technical risks, tradeoffs, and status clearly to both technical and non-technical audiences. Basic Qualifications: Bachelor's degree in computer science, computer engineering, electrical engineering, networking, or a related technical field, and 8+ years of relevant experience; additional relevant experience may be considered in lieu of degree. Experience leading the design and execution of routing, network emulation, telemetry, and network-response capabilities. Deep routing protocol knowledge, including protocol-internals understanding of BGP, OSPF, IS-IS, or comparable protocols. Experience with SPF behavior, LSA flooding, path attributes, convergence behavior, and routing tradeoffs. Hands-on Linux networking experience, including namespaces, veth pairs, iproute2, iptables/nftables, and tc. Docker or container networking experience, including bridge, macvlan, host modes, CNI plugins, and nested networking failure modes. Experience with open-source routing stacks such as FRR, Bird, Quagga, or similar. Hands-on programming experience in Python and C++, with ability to read, write, and review production-quality code. Experience with network simulation or emulation at scale. Experience implementing CI/CD, regression testing, or reproducible validation pipelines for networking or systems projects. Experience with distributed systems, network telemetry, or state-distribution mechanisms. Ability to lead technical work under ambiguity while remaining hands-on with implementation and lab execution. Must be a US citizen with ability to obtain and maintain a US government security clearance. Preferred Qualifications: Experience with gNMI, OpenConfig, streaming telemetry, or comparable observability/control-plane data sources. Open-source routing or network-stack contribution history. Prior experience on government-funded R&D programs such as DARPA, IARPA, ONR, AFRL, ARL, DOE, or NSF. Experience leading small technical teams in high-ambiguity research, prototype, or advanced development environments. Experience presenting and defending technical approaches to government customers, technical reviewers, or external advisors. 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: June 24, 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 $107,900.00 - $195,050.00 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. Leidos Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $17.2 billion for the fiscal year ended January 2, 2026. For more information, visit Pay and Benefits Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available here. Securing Your Data Leidos will never ask you to provide payment-related information at any part of the employment application process. And Leidos will communicate with you only through emails that are sent from a Leidos.com email address. If you receive an email purporting to be from Leidos that asks for payment-related information or any other personal information, please report the email to View email address on click.appcast.io. Commitment and Diversity All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.