SimSpace Corporation - Senior Software Engineer, Network Simulations

• We invite you to apply today! • We are looking for a Senior Software Engineer to serve as the technical lead for SimSpace's internet simulation platform — the system that makes cyber range environments behave like the real internet at the network layer. This is foundational, novel work: you will be designing and building a kernel-level simulation layer that reproduces the observable behavior of worldwide internet routing — correct ASN topology, realistic inter-AS latency, accurate traceroute and MTR output — without instantiating a single virtual router. • We are looking for a Senior Software Engineer • The approach is grounded in a patent pending eBPF-based architecture developed at SimSpace, and this role will take that proof of concept into a production-grade system. As the technical lead on a newly formed team, you will set architectural direction, mentor peer engineers, and partner closely with a Principal Engineer and your Engineering Manager to build something that does not yet exist at this fidelity in the industry. • The team is responsible for: • A persistent, control-plane internet simulation service that serves multiple concurrent cyber ranges without per-range instantiation • An eBPF-based network simulation layer providing geographically accurate ASN routing, inter-AS latency enforcement, and traceroute and MTR fidelity entirely in kernel space • Lightweight in-range proxy agents that receive topology configuration from the control plane and handle local packet interception without requiring a full simulation stack in every range • A topology database encoding real-world ASN-to-CIDR mappings, inter-AS latency models, and geographic placement data that drives the simulation • Dynamic reconfiguration of the simulated internet topology at runtime without disrupting in-flight traffic • What will you be doing as a Senior Software Engineer II, Network Simulation at SimSpace? • Own 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 topology • Design 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 apply • Architect 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 forwarding • Define 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 management • Serve 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 team • Partner with other Engineers on novel simulation challenges, bring independent judgment to architectural tradeoffs, and shape the technical roadmap • Mentor engineers on the team, raising the bar on systems design, kernel-level debugging, and engineering rigor • Collaborate with adjacent platform teams on the operational model for a long-lived, multi-tenant service serving active cyber range deployments • Typescript, React, Postgres, Kotlin, Kubernetes, Spring Boot • What are the qualifications to apply? To be successful as a Senior Software Engineer, Network Simulation you need to have: • Deep expertise in Linux kernel networking and eBPF program development, including XDP, TC hooks, BPF map types, and the tradeoffs involved in kernel-space packet processing • Strong systems programming skills — C or Rust for eBPF program development, and Go or Python for the control-plane agent and tooling layer • Solid understanding of real-world internet routing — BGP, ASN topology, CIDR allocation, inter-AS peering — sufficient to model it faithfully without running routing software • Experience designing systems with well-defined control plane and data plane separation, particularly where distributed components may have intermittent connectivity to a central controller • Demonstrated technical leadership: you have set architectural direction and driven engineering quality across a team, whether as a tech lead, principal, or senior-plus individual contributor • Comfort 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 scale • Familiarity with Kubernetes as the deployment environment for both control plane services and distributed agent components • Experience with network simulation, traffic shaping, or cyber range infrastructure is a strong plus • Prior work in cybersecurity, defense, or government-adjacent environments is a plus due to SimSpace’s customer base • We’re proud to offer a competitive and comprehensive package designed to support your well-being, growth, and success: • Compensation. Base salary range: $160,000 - $225,000, reflecting our confidence in your expertise and impact, with the opportunity for annual bonuses tied to company performance and individual contributions.