Senior Software Engineer, Network Simulations

SimSpace

Technical lead designing eBPF-based routing simulation for SimSpace's internet simulation platform. Collaborate with engineers to build innovative cybersecurity solutions.

Posted 6/16/2026full-timeRemote • 🇺🇸 United StatesSenior💰 $160,000 - $225,000 per yearWebsite

Tech Stack

Tools & technologies

Cyber SecurityDNSGoKubernetesLinuxPythonRust

About the role

Key responsibilities & impact

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

Requirements

What you’ll need

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.

Benefits

Comp & perks

Comprehensive 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.
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.
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.

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

eBPF program developmentLinux kernel networkingC programmingRust programmingGo programmingPython programmingBGPCIDR allocationnetwork simulationtraffic shaping

Soft Skills

technical leadershipmentoringarchitectural decision makingcollaborationindependent judgment