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!

As a Senior Software Engineer on our Range Operations Team, you will provide deep expertise in microservices, event-driven messaging systems, and containerization to architect the next generation of high-fidelity simulation. You are a technically fearless developer who thrives on solving hard problems in new ways.

In this role, you will go beyond maintaining infrastructure—you will invent it. You will lead the development of bespoke, hybrid solutions that generate realistic simulated traffic across a complex ecosystem—from IoT systems and local software to modern SaaS platforms and cloud-native environments. By leveraging AI, LLM, and advanced API capabilities, you will drive technical innovations that simulate real-life cyber attacks and human-user personas with unprecedented realism and cutting edge technologies. You will act as a force multiplier for the team, guiding best coding practices and system architecture to ensure our engineering standards remain exemplary.

What will you be doing

Bespoke Development & AI Integration: Design and build custom tooling, scripts, and applications that leverage AI and LLMs to generate realistic simulated traffic to SaaS providers, cloud platforms, and enterprise endpoints.

Core Service Engineering: Design, develop, and maintain core services for cybersecurity range simulation, focusing on scalability, performance, and fault tolerance.

Technical Leadership & Mentorship: Lead end-to-end technical projects and mentor engineers on the team, promoting a collaborative culture and guiding them in architectural design.

Infrastructure & Emulation: Create emulated cloud services and synthetic data pipelines, ensuring environments behave realistically under both attacker and defender activity.