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! Senior Software Engineer 1 (AUE: Attack and User Emulation Team) We are looking for:As a Backend Senior Software Engineer, AUE (AUE: Attack and User Emulation) to provide expertise in microservices, event-driven messaging systems, Spring Boot, and containerization. In this role, you will drive delivery of various containerized microservices that provide the core emulation services of our cyber ranges. These services allow our users to simulate real-life cyber attacks and user personas to add high fidelity realism to our products. You'll be responsible for ensuring our engineering practices are exemplary by guiding the team on best coding practices, system architecture, and cultivating a culture of continuous improvement. Your mentorship will be key in helping team members grow, while you contribute directly to code, design, and architecture. What will you be doing as our Backend Senior Software Engineer, AUE: - Design, develop, and maintain core services for cybersecurity range simulation, focusing on scalability, performance, and fault tolerance. - Lead end-to-end technical projects, from requirements gathering and architecture design to deployment, while setting clear goals and priorities. - Mentor and support engineers on the team, promoting a collaborative culture and guiding them in coding best practices, testing, and architectural design. - Collaborate cross-functionally with Product Managers and UX Designers to translate requirements into technically sound, user-centered solutions. - Conduct code reviews and provide constructive feedback to ensure code quality, performance, and adherence to company standards. - Implement robust monitoring and alerting strategies to maintain high uptime and quick response to potential system issues. - Ensure services meet security and compliance standards by integrating appropriate controls into the development lifecycle. - Contribute to documentation that details technical architecture, system design, and best practices to ensure knowledge sharing and team alignment. What are the qualifications to apply? To be successful as a Backend Senior Software Engineer (AUE: Attack and User Emulation Team) you need to have: - 6+ years of hands-on experience in software development with a strong focus on building large-scale, distributed systems. - Expertise in an OOP-based language such as Java or Kotlin, with a demonstrable understanding of API design, integration, and best practices. - Proven experience with unit testing, integration testing, and deploying services in Kubernetes or a similar container orchestration platform. - Demonstrated ability to design, build, and operate fault-tolerant systems, including experience in requirements gathering and project breakdown. - Knowledgeable in cyber security with a broad understanding of offensive and defensive security. Who you are: - You feel comfortable leading, driving, and delegating team initiatives - You enjoy solving complex problems & building solutions through collaborative methods - You’re always open for feedback, and are willing to give feedback to your colleagues - You understand that nothing is perfect and there is always room for improvement - You are driven off of goals and team outcomes - You’re focused on the iterative delivery of high-quality well tested code - You’re conscious of scalability, re-usability, but also pragmatic when it comes to trade-offs - You’ve worked in or tangential to the cybersecurity field Our Tech Stack: Python, golang, Kotlin, Java, Kubernetes, Docker, Spring Boot, VMware We’re proud to offer a competitive and comprehensive package designed to support your well-being, growth, and success: • Compensation. Base monthly pay range: 1,500,000 CRC - 2,500,000 CRC reflecting our confidence in your expertise and impact, with the opportunity for annual bonuses tied to company performance and individual contributions. • Health & Wellness. Private medical, dental, vision, and life benefits. • Mental Health Support. Access to company-paid counseling, coaching, and resources for you and your family through Spring Health. • Parental Leave. Paid leave plans to support you and your loved ones during life’s most important moments. • Ownership Opportunities. Equity stock options at hire, with annual performance-based grants—become an invested stakeholder in our shared success. • Continuous Learning. Access a LinkedIn Learning membership to prioritize your personal and professional development. • Social Connections. Monthly reimbursements for meaningful connections with teammates through our SocialSpace Community. SimSpace is an Equal Opportunity Employer: In compliance with federal law, all persons hired will be required to verify identity and eligibility to work in the United States and to complete the required employment eligibility verification document form upon hire. SimSpace is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, pregnancy, genetic information, disability, status as a protected veteran, or any other protected category under applicable federal, state, and local laws. We are committed to providing an inclusive and welcoming environment for all members of our staff, clients, volunteers, subcontractors, vendors, and clients. Research shows that women and people from underrepresented groups only apply to jobs if they meet all of the qualifications. However, no one ever meets 100% of the qualifications. SimSpace encourages you to break that statistic and to apply. We look forward to your application! We also consider qualified applicants regardless of criminal histories, in accordance with applicable law. We are committed to providing reasonable accommodations for qualified individuals with disabilities in our job application procedures. If you need assistance or accommodation due to a disability, please contact [careers@simspace.com](mailto:careers@simspace.com). SimSpace does not accept unsolicited resumes from employment agencies. Actual compensation for the position is based on a variety of factors, including, but not limited to affordability, skills, qualifications and experience, and may vary from the range.