Backend Software Engineer (Internet Services Simulation)

SimSpace serves as an AI Proving Ground where organizations can confidently train, test, and outmaneuver adversaries in any environment. Trusted by allied governments, militaries, enterprises, and research institutions worldwide, SimSpace enables adaptive, AI-ready defenses that stay ahead of evolving threats. Founded in 2015 by experts from U.S. Cyber Command and MIT Lincoln Laboratory, the platform unifies training, testing, and validation in a realistic, live-fire simulation—helping teams evaluate security investments, optimize performance, and compress cyber readiness cycles from months to days. Why join SimSpace? We are an organization that is focused on building our culture and mindfully enhancing our atmosphere every day which is why we have collaborated on an integral value system. Our governing philosophy of being Human Centered is deeply embedded within our value system. We apply this philosophy to every one of our internal team members, external clients, and their customers. How Do We Work? We believe that people are at the center of everything we do. SimSpace fosters a culture of continuous learning, curiosity, and professional growth. That belief shows up in action: in-house training, internal and external learning platforms, cyber conferences, industry events, and dedicated time for skill development. Our people are empowered to shape their careers - and it shows. Year over year, SimSpace consistently outperforms industry benchmarks in internal mobility, promotions, and total rewards growth. Who Thrives Here? We are a team of innovators, protectors, and problem-solvers. We believe diversity of thought and experience fuels better solutions, and we’re committed to building teams that reflect the communities we serve. Whether you’re remote or office-based, you’ll collaborate with talented colleagues across departments and time zones, united by the mission to create a safer digital world. We invite you to apply today! We are looking for a Software Engineer to build and operate the simulated internet services layer of SimSpace's internet simulation platform. The network simulation layer handles routing and latency; this role handles the internet itself — deploying and operating a persistent catalog of simulated and real internet services (think: fake GitHub, fake social media, fake webmail, AWS, GCP, Azure, and dozens of real SaaS apps) that red and blue teams interact with. This is a creative and technically broad role that combines service deployment automation, content generation, and DNS and email infrastructure to produce an internet environment that is indistinguishable from the real thing at the application layer. The team is responsible for: - A persistent catalog of simulated internet services including open-source self-hosted platforms (social media, file sharing, webmail, collaboration tools, and others) and custom services that approximate major internet properties - Incorporate hooks to bring real…