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 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 internet SaaS applications seamlessly into the simulated internet

Simulate and/or bridge to popular cloud services in AWS, GCP, Azure, and others

Content seeding and web scraping pipelines that populate simulated services with realistic data — repositories, social posts, email threads, user activity — making them plausible to human operators and automated tooling alike

External DNS infrastructure: the internet simulation platform is the authoritative resolver for all simulated public domains, with correctly configured mail, sender authentication, and domain registration records

The email delivery boundary between the internet simulation platform and in-range mail infrastructure, enabling realistic and scenario-driven email including adversarial content for red team exercises