Team CATHEXIS elevates the government contracting experience through rapid response, deep skill, and thoughtful problem-solving and communication. Our core capabilities are our top-tier program and project management, data analytics, and audit services, the backbone of which is our integrated approach to operational excellence. You worked hard to get to where you are. You strive to make every day better than the day before. So do we. Team CATHEXIS operates with an all-in mindset. We are working together to create a company that supports our shared values and individual goals. Our values are centered around Respect, Engagement, Customer Service, Integrity, Teamwork, and Excellence in everything we do for our employees, clients, partners, and communities. We believe success is best when we listen and lead with empathy; model high standards of ethics to provide a rewarding candidate experience; work hard, have fun, and appreciate the strengths we all bring to the team; and empower our employees to create innovative and trusted results. We are looking for a dynamic Principal Engineer to join our team! CATHEXIS Labs is seeking a hands-on Principal Engineer/Solution Architect to serve as the technical anchor for its innovation-focused lab environment. This role is centered on building and delivering demonstrable, production-ready solutions at startup velocity within a government contracting context, with a strong emphasis on emerging technologies such as AI/ML. The Principal Engineer will have broad technical autonomy, minimal bureaucracy, and direct access to leadership, including close collaboration with the CTO to translate strategic ideas into working systems. Responsibilities include designing and implementing full-stack solutions across AI/ML, web and mobile applications, cloud-native microservices, DevSecOps, and infrastructure automation. This is not a management role; success depends on the ability to operate in ambiguity, make real-time architectural decisions, communicate effectively with both technical and business stakeholders, and consistently build, iterate, and deliver.