The weaponization of AI is driving a paradigm shift in the cyber security industry from proactive to preemptive security: clients must now invest more intelligence and effort in understanding their vulnerabilities before their adversaries do (Open AI). The only way to achieve this is to simulate future attack scenarios at scale, and to run them in high fidelity digital replicas of production environments (Gartner/Forrester). SimSpace serves as the AI Proving Grounds to generate hypersynthetic data which pressure tests controls, tools, teams, and agentic capabilities in full kill chain attacks hidden in realistic environmental traffic and patterns of life.

Founded in 2015 by experts from U.S. Cyber Command and MIT Lincoln Laboratory, the platform was initially conceived to assist in Offensive Cyber Operations (OCO), to quickly replicate target environments to conduct mission rehearsal of human operators and their tools to deny (disrupt, degrade, destroy) or deceive (manipulate or exfiltrate data) adversaries. The company has since expanded to serve over a dozen allied governments in OCO/DCO as well as critical infrastructure enterprises around the world. The company is actively investing in the Americas, Asia Pacific, Europe and the Middle East through direct sales and channel partners. SimSpace has launched the AI Proving Grounds Consortium, leading the revolution by creating an open platform for the InfoSec ecosystem to train, validate and operationalize their agentic capabilities before committing to production.

Why join SimSpace?

We are a team united by a shared purpose and four core values: Serve to Protect, Acquire Understanding, Teamwork without Borders, and Operate as Innovators. We value candid, constructive feedback and create opportunities for personal, professional, and financial growth. Our vision, “Defend the Free World,” drives our mission: “Defeat Any Adversary in Any Cyber Terrain at Machine Speed.”

How Do We Work?

We listen to customers and colleagues, challenge assumptions, and turn ideas into meaningful results. We expect everyone to embrace emerging technologies, simplify and automate work, and use AI to learn, solve problems, and help deliver quality with speed. We apply human judgment and take responsibility for outcomes. Whether remote or office-based, we collaborate across teams and time zones.

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.

The team is responsible for

The control plane API: the external-facing interface through which range orchestration, scenario management, and user emulation systems drive the internet simulation platform, creating services, registering personas, updating topology, and querying state

The event-driven orchestration backbone that coordinates actions across the platform's simulation layers, network, services, identity, and storage, and maintains consistent state across a distributed, multi-range deployment

Persistent storage infrastructure for the platform: service data, content corpora, certificate stores, topology state, and the volumes that simulated services depend on