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!

About the Role

SimSpace builds the environments where the world's leading organizations train, test, and operationalize their cyber capabilities with confidence. We want the engineering teams behind that platform to set the standard for building software in the age of AI, not catch up to it.

As a Staff Software Engineer, you'll be a senior technical leader on one of our engineering teams, with influence well beyond it—setting the standards for how teams build with AI, driving cross-team projects forward, and contributing directly to the code. You'll practice spec-driven development with AI agents yourself, show teams how to do the same, and partner deeply with Product Managers, UX Designers, QA, platform teams, and engineers across the organization.

This is a hands-on technical leadership role, not a people-management one, and it carries a high degree of agency. You'll work as a true partner to your Engineering Manager, with the latitude to act on what you see. We're looking for an experienced engineer who wants real ownership—of the technical direction, of the outcomes, and of how teams build in the age of AI.

What You'll Do

Set the Standard for AI-Native Development

Define and model how teams build software with AI—how work is specified, how agents are directed, and how AI-generated code is reviewed, tested, and owned.

Champion spec-driven development: write clear specs, plans, and acceptance criteria up front, direct AI agents to implement against them, and help teams make it their default way of working.

Turn what works into durable standards, playbooks, and templates that teams adopt because they make the work faster, not because they're mandated.