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!

The opportunity

SimSpace is building the AI Proving Grounds: a destructive-safe, non-production environment where organizations evaluate AI agents, tools, teams, and processes before deployment—and continue testing as they evolve.

We’re hiring a high-ownership enterprise seller to lead a small portfolio of strategic AI providers and selected AI-leading enterprises. You will work directly with security, AI, and executive teams to identify consequential use cases, shape evaluations around customer outcomes, and carry opportunities from first conversation through close and expansion.

This role calls for deep account focus, technical curiosity, and strong commercial judgment. You’ll spend your time building executive access and advancing a small number of important accounts.

What you’ll do

Own a deliberately small portfolio—approximately 5–8 named accounts—with tailored account plans, stakeholder maps, and clear next steps.

Engage in model building, evaluation and hill-climbing activities alongside strategic model providers

Build relationships with CISOs and security leaders, AI and engineering leaders, and the management budget owners who can fund the work.

Lead direct, account-specific outreach and develop credible introduction paths through customers, executives, and partners.

Learn how each account is developing and deploying AI agents; identify where security teams need evidence before agents or workflows move into production.

Turn customer priorities into specific evaluation use cases, such as testing agent behavior, security workflows, tools, and teams against realistic adversarial scenarios.

Work with Sales Engineering, Field CISO, Product, and Professional Services to shape the right technical and commercial approach.