Senior Software Engineer, Network Simulation

Role Description

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.

• Design and build a kernel-level simulation layer that reproduces correct ASN topology, realistic inter-AS latency, and accurate traceroute and MTR output.
• Take a proof of concept into a production-grade system using a patent pending eBPF-based architecture.
• Set architectural direction, mentor peer engineers, and partner closely with a Principal Engineer and Engineering Manager.

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 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.
• Dynamic reconfiguration of the simulated internet topology at runtime without disrupting in-flight traffic.

Qualifications

• Deep expertise in Linux kernel networking and eBPF program development, including XDP, TC hooks, and BPF map types.
• 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.
• Experience designing systems with well-defined control plane and data plane separation.
• Demonstrated technical leadership — setting architectural direction and driving engineering quality across a team.
• Comfort at the intersection of research and production engineering.
• 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.

Requirements

• Own the end-to-end architecture of the eBPF-based routing simulation layer.
• Design and build the control-plane topology database and the pipeline for real-world internet topology data.
• Architect the in-range proxy agent that bridges the persistent control plane to individual cyber ranges.
• Define the interface contract between the control plane and in-range agents.
• Serve as technical lead for the team, conducting design reviews and maintaining engineering quality.
• Partner with other Engineers on novel simulation challenges.
• Mentor engineers 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.

Benefits

• Base salary range: $160,000 - $225,000, with opportunities for annual bonuses.
• Comprehensive medical, dental, and vision benefits, with coverage starting on day one.
• Access to company-paid counseling, coaching, and resources for mental health support.
• 401(k)-retirement savings plan featuring a company match.
• Unlimited vacation and dedicated health & wellness days.
• Paid parental leave plans.
• Equity stock options at hire, with annual performance-based grants.
• Referral rewards for qualified hires through the employee referral program.
• Full- and partial-subsidized membership plans and equipment discounts through the Peloton Interactive Wellness Program.
• Access to a LinkedIn Learning membership for personal and professional development.
• Monthly reimbursements for meaningful connections with teammates.
• Legal plan coverage, pet insurance, wellness reimbursements, and more.