Software Engineer

Description 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 cyberresponse 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. 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. #J-18808-Ljbffr