Senior Software Engineer, Backend

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 Senior Software Engineer to build the orchestration engine at the heart of SimSpace's internet simulation platform. Every action in the platform, standing up a simulated service, registering a persona, pushing a topology update to a range, delivering a file to a scenario, provisioning a SaaS application, flows through the control plane this engineer owns. Where the other engineering roles on the team build the simulation layers themselves, this role builds the system that ties them together: the API surface that external systems call, the event-driven backbone that coordinates actions across subsystems, and the deployment and operational model that keeps a complex, multi-tenant platform running reliably across many concurrent range deployments. If you are energized by building systems that other engineers depend on and have strong instincts for distributed systems correctness and operational rigor, this role is for you.