Senior Software Engineer Startup Jobs in Colorado

SPACE SYSTEMS

At Rocket Lab, we're not just launching rockets — we're building the future of space. Our Space Systems team builds everything from complete spacecraft, precision payloads to the components and subsystems that allow them to thrive in space, like solar panels, flight software, star trackers, optical systems, separation systems, radios, and more.

Our Space Systems team has enabled more than 1,700 missions, ranging from interplanetary exploration, in-space manufacturing to national security and defense initiatives. The team has built spacecraft, payloads, and components for missions to the Moon and Mars, working with partners including NASA, the Space Development Agency, and the U.S. Space Force. Whether it's a single high-performance spacecraft, constellation, or the vertically integrated components that help them get to space — our world class Space Systems team is empowering some of the boldest and most ambitious space missions.

SENIOR SOFTWARE ENGINEER I/II - DIGITAL ENGINEERING

Are you passionate about advancing aerospace technology through cutting-edge software solutions? We're looking for a driven Senior Software Engineer I/II to join our Digital Engineering team, based out of our Littleton, CO site. You will play a pivotal role in developing next-generation simulation and modeling tools that support aerospace systems, including flight software and ground software capabilities. This role offers the opportunity to work on innovative projects that enhance aerospace systems through scalable architectures, intuitive user interfaces, and robust software solutions.

You'll be part of a collaborative team, contributing to all phases of software development—from requirements definition and design to coding, testing, and deployment. Our stack includes .NET, Angular, and relational databases, with a focus on scalable architectures and RESTful APIs.

WHAT YOU'LL GET TO DO:

• Design, develop, and maintain simulation and modeling tools that support aerospace systems, including flight and ground software capabilities
• Design and develop mission level wargaming tools encompassing space, air, and ground domains
• Design products for analyzing laser communication constellation networks
• Develop application software based on web technologies that runs across multiple operating systems, including Windows and Linux
• Apply UI/UX best practices to create streamlined, intuitive user interfaces for simulation and configuration tools
• Collaborate with cross-functional teams to analyze requirements, define system architectures, and deliver high-quality solutions
• Participate in design reviews (e.g., PDR, CDR) and contribute to the refinement of system requirements and technical specifications
• Conduct code reviews to ensure adherence to company coding standards and best practices
• Optimize software performance and scalability for large-scale simulations and data processing

(Please note: This position can be hired at the Senior Software Engineer I or Senior Software Engineer II level.)

QUALIFICATIONS YOU'LL BRING AS SENIOR SOFTWARE ENGINEER I:

• Bachelor's degree in Computer Science, Computer Engineering, or a related technical discipline
• 5+ years of experience in software development, with a focus on simulation, modeling, or aerospace systems
• Proficiency in C#/.NET and Angular (or similar frontend frameworks like React or Vue)
• Experience with TypeScript/JavaScript and building RESTful APIs
• Solid grasp of object-oriented programming principles and design patterns
• U.S citizenship is required, due to program requirements

QUALIFICATIONS YOU'LL BRING AS SENIOR SOFTWARE ENGINEER II:

• Bachelor's degree in Computer Science, Computer Engineering, or a related technical discipline
• 8+ years of experience in software development, with a focus on simulation, modeling, or aerospace systems
• Proficiency in C#/.NET and Angular (or similar frontend frameworks like React or Vue)
• Experience with TypeScript/JavaScript and building RESTful APIs
• Solid grasp of object-oriented programming principles and design patterns
• U.S citizenship is required, due to program requirements

THESE QUALIFICATIONS WOULD BE NICE TO HAVE:

• Active Secret clearance, Top Secret clearance, or ability to obtain and maintain one
• Master's or PhD in Computer Science, Computer Engineering, or a related technical field
• Experience with Docker/Kubernetes for containerization and orchestration
• Knowledge of network programming (e.g., Sockets, WebSockets) for real-time data exchange
• Strong understanding of relational databases (e.g., MySQL, SQL Server, SQLite)
• Passion for rapid prototyping and software integration leveraging AI tools
• Passion for UI/UX design
• Experience with space mission analysis tools such as STK, or similar
• Experience with modeling of physical systems
• Familiarity with Git and modern version control workflows.
• Experience working in Agile/Scrum environments and contributing to iterative development cycles
• Advanced knowledge of Angular NgRx or other state management libraries
• Strong problem-solving skills and the ability to debug complex systems
• A team-oriented mindset with excellent communication skills and a positive attitude

This position may require prolonged periods of sitting, standing, walking, computer work, and occasional exposure to moderate levels of noise, dust, and fumes in production areas.