[Remote] Senior Software Engineer, Network Simulations

Note: The job is a remote job and is open to candidates in USA. SimSpace is an AI Proving Ground that enables organizations to train, test, and outmaneuver adversaries in various environments. They are seeking a Senior Software Engineer to serve as the technical lead for their internet simulation platform, responsible for designing and building a kernel-level simulation layer that accurately reproduces internet routing behavior. The role involves architectural direction, mentoring engineers, and collaborating with other teams to develop a multi-tenant service for cyber range deployments.ResponsibilitiesOwn the end-to-end architecture of the eBPF-based routing simulation layer, including XDP and TC hook point design, BPF map structure, and synthetic ICMP TTL-exceeded generation that makes traceroute and MTR behave correctly against the simulated topologyDesign and build the control-plane topology database and the pipeline that compiles real-world internet topology data into a form that in-range agents can consume and applyArchitect the in-range proxy agent: the lightweight component that bridges the persistent control plane to individual cyber ranges, applying topology configuration locally and handling DNS delegation and traffic forwardingDefine the interface contract between the control plane and in-range agents, including topology update propagation, graceful degradation when control plane connectivity is interrupted, and agent lifecycle managementServe as technical lead for the team — making daily architectural decisions across the full service scope, conducting design reviews, and maintaining engineering quality across all four engineering roles on the teamPartner with other Engineers on novel simulation challenges, bring independent judgment to architectural tradeoffs, and shape the technical roadmapMentor engineers on the team, raising the bar on systems design, kernel-level debugging, and engineering rigorCollaborate with adjacent platform teams on the operational model for a long-lived, multi-tenant service serving active cyber range deploymentsSkillsDeep expertise in Linux kernel networking and eBPF program development, including XDP, TC hooks, BPF map types, and the tradeoffs involved in kernel-space packet processingStrong systems programming skills — C or Rust for eBPF program development, and Go or Python for the control-plane agent and tooling layerSolid understanding of real-world internet routing — BGP, ASN topology, CIDR allocation, inter-AS peering — sufficient to model it faithfully without running routing softwareExperience designing systems with well-defined control plane and data plane separation, particularly where distributed components may have intermittent connectivity to a central controllerDemonstrated technical leadership: you have set architectural direction and driven engineering quality across a team, whether as a tech lead, principal, or senior-plus individual contributorComfort at the intersection of research and production engineering — this role involves taking a proof of concept and building it into something that runs reliably at scaleFamiliarity with Kubernetes as the deployment environment for both control plane services and distributed agent componentsExperience with network simulation, traffic shaping, or cyber range infrastructure is a strong plusPrior work in cybersecurity, defense, or government-adjacent environments is a plus due to SimSpace's customer baseBenefitsOffers EquityOffers BonusComprehensive medical, dental, and vision benefits, plus savings plans—coverage starts on day one!Access to company-paid counseling, coaching, and resources for you and your family through Spring Health.Plan for your future with a 401(k)-retirement savings plan featuring a company match.Take the time you need with unlimited vacation and dedicated health & wellness days. SimSpace provides flexible solutions to meet the diverse work-life needs of team members.Paid leave plans to support you and your loved ones during life’s most important moments.Equity stock options at hire, with annual performance-based grants—become an invested stakeholder in our shared success.Earn $1,500–$3,500 for every qualified hire through our employee referral program.Full- and partial- subsidized membership plans and equipment discounts to help you reach your personalized fitness goals.Access a LinkedIn Learning membership to prioritize your personal and professional development.Monthly reimbursements for meaningful connections with teammates through our SocialSpace Community.Legal plan coverage, pet insurance, wellness reimbursements, and more to simplify life’s details.Company OverviewSimSpace combines high-fidelity, military-grade cyber ranges and training content with unique user and adversary emulation techniques. It was founded in 2015, and is headquartered in Boston, Massachusetts, USA, with a workforce of 201-500 employees. Its website is https://www.simspace.com/.