This description is a summary of our understanding of the job description. Click on 'Apply' button to find out more. Role Description AstroNetix is seeking an experienced Senior Backend Software Engineer with mandatory OpenC3 COSMOS expertise to support space and mission command and control systems. This role focuses on backend development, integration, and operational hardening of COSMOS-based command and telemetry systems used in national security environments. The successful candidate will work closely with systems engineers, operators, and security teams to ensure reliable, secure command execution and telemetry flow across distributed mission systems. - Configuring and extending OpenC3 COSMOS - Developing and integrating backend services (primarily Java Spring Boot) - Defining and maintaining command and telemetry schemas - Implementing DevSecOps practices to support secure, resilient operations - Integrating COSMOS with mission analysis tools, orchestration frameworks, and AI-enabled backend services Qualifications - Hands-on, production experience with OpenC3 COSMOS (required) - Backend software engineering experience building Java Spring Boot services - Strong experience with DevSecOps practices, including CI/CD pipelines, containerization, and secure deployments - Experience with command and telemetry systems or mission control software - Familiarity with message-driven or distributed system architectures - Experience integrating backend systems with mission tools or frameworks (e.g., FreeFlyer, Meridian, or similar systems) - Experience supporting or integrating AI-enabled backend services or analytics pipelines - Ability to support mission-critical systems with a focus on correctness, reliability, and security - U.S. citizenship required - Active TS/SCI required

• Develop and maintain back-end services and APIs using .NET (C#); • Design, implement, and optimize back-end system architectures, ensuring the performance and scalability of solutions; • Collaborate with front-end, design, and product teams to ensure solutions meet customer and company requirements; • Write clean, efficient, and well-documented code, following development best practices and coding standards; • Implement automated tests (unit and integration) to ensure code quality and reliability; • Actively participate in code reviews, suggesting improvements and helping the team maintain project quality; • Identify and resolve production issues, ensuring application stability and availability; • Stay up to date with new technologies and best practices related to back-end development, proposing improvements to existing projects; • Contribute to the planning and estimation of new projects, providing technical input;

Apogee Global RMS is looking for a Java Full Stack Developer who will be able to design, build, and scale complex systems end‑to‑end. This role requires strong technical depth in Java/Spring Boot, modern front‑end frameworks, and the ability to influence architecture, mentor others, and deliver high‑quality solutions in a fast‑moving environment. Key Responsibilities: - Lead development of full‑stack features using Java/Spring Boot and React or Angular - Architect scalable APIs, services, and integrations - Own end‑to‑end delivery from design to deployment - Improve system performance, reliability, and security - Collaborate with product, design, and engineering teams to shape solutions - Conduct code reviews and mentor junior developers - Contribute to architectural decisions and best‑practice engineering standards

• Leading technical decisions and influencing our SaaS solutions. • Developing and maintaining backend applications for our gaming platforms. • Optimizing existing systems for performance and scalability. • Collaborating with a distributed team to create new features. • Conducting code and architectural reviews. • Solving complex business problems with innovative solutions. • Participating in on-call rotations within the squad to ensure the reliability and availability of our systems.