Backend Senior Software Engineer, Attack and User Emulation Team (AUE)

SimSpace serves as an AI Proving Ground where organizations can confidently train, test, and outmaneuver adversaries in any environment. Trusted by allied governments, militaries, enterprises, and research institutions worldwide, SimSpace enables adaptive, AI-ready defenses that stay ahead of evolving threats. Founded in 2015 by experts from U.S. Cyber Command and MIT Lincoln Laboratory, the platform unifies training, testing, and validation in a realistic, live-fire simulation—helping teams evaluate security investments, optimize performance, and compress cyber readiness cycles from months to days.

Why join SimSpace? We are an organization that is focused on building our culture and mindfully enhancing our atmosphere every day which is why we have collaborated on an integral value system. Our governing philosophy of being Human Centered is deeply embedded within our value system. We apply this philosophy to every one of our internal team members, external clients, and their customers.

How Do We Work? We believe that people are at the center of everything we do. SimSpace fosters a culture of continuous learning, curiosity, and professional growth. That belief shows up in action: in-house training, internal and external learning platforms, cyber conferences, industry events, and dedicated time for skill development. Our people are empowered to shape their careers - and it shows. Year over year, SimSpace consistently outperforms industry benchmarks in internal mobility, promotions, and total rewards growth.

Who Thrives Here? We are a team of innovators, protectors, and problem-solvers. We believe diversity of thought and experience fuels better solutions, and we’re committed to building teams that reflect the communities we serve. Whether you’re remote or office-based, you’ll collaborate with talented colleagues across departments and time zones, united by the mission to create a safer digital world.

We invite you to apply today!

We are looking for: a Backend Senior Software Engineer, Attack and User Emulation Team (AUE), you will serve as a primary technical leader driving the evolution of our core cyber range emulation platform. In this role, you will leverage deep expertise in microservices, event-driven messaging systems, Spring Boot, and containerization to architect and scale complex, distributed emulation services. These high-impact systems enable our users to simulate real-world cyber attacks and user personas with high fidelity and realism.

As a Senior Software Engineer, AUE, you will help shape the integration of AI-assisted capabilities into the platform. You will design scalable, secure patterns for coordinating AI-enabled services and workflows so that attack and user emulations can become more dynamic, autonomous, and responsive. You may evaluate and adopt emerging interoperability approaches, including Model Context Protocol (MCP) and Agent-to-Agent (A2A) protocol, as the platform evolves.

Your reach extends beyond feature delivery. You will own the long-term technical vision and architecture for critical platform capabilities, drive engineering excellence across teams, and act as a multiplier by mentoring engineers and shaping team strategy. You will balance strategic architectural design with hands-on code delivery, solving complex, high-risk technical problems.

What will you be doing as our Senior Software Engineer, AUE:

• Architectural Leadership & Execution: Architect, design, and deliver highly scalable, fault-tolerant, and resilient distributed microservices for cybersecurity range simulations, setting technical standards across systems.

• AI & Agent Infrastructure: Design and implement platform capabilities that coordinate AI-enabled services and autonomous workflows to support intelligent emulation behaviors, reliable context exchange, and clear operational controls. You will evaluate and adopt appropriate interoperability patterns and protocols as the platform evolves.

• Cross-Functional & Strategic Ownership: Partner closely with Product Managers, UX Designers, and Engineering Leadership to define roadmap priorities, decompose multi-quarter initiatives into actionable technical milestones, and lead complex end-to-end execution.

• Technical Excellence & Standards: Drive system reliability, performance tuning, and fault tolerance strategies. Establish and champion best practices in code quality, testing methodologies, API design, and system architecture across the team.

• Mentorship & Talent Development: Mentor and coach engineers across levels, actively supporting their growth through regular