Top Principal Software Engineer Jobs in Denver & Boulder, CO

Lead technical vision and execution for enterprise-scale AI, automation, and data initiatives. Architect scalable, secure AI systems and data pipelines, mentor engineers, drive cross-functional alignment, and deliver high-impact production solutions that improve productivity and business outcomes.

The Principal Software Engineer will architect and lead the development of scalable systems, drive technical excellence, mentor teams, and promote best practices at a fintech company.

Design, develop, and test software applications for space systems, providing technical leadership and mentoring while ensuring code quality and scalability.

As a Principal Software Engineer, you'll architect and code backend services and ML models, integrate them with Salesforce, and mentor junior engineers.

Design and build scalable backend platforms for regulated scientific workflows, ensuring compliance and reproducibility while enhancing performance and usability across cloud environments.

Lead design and development of enterprise-grade RESTful APIs and platform components. Drive technical decisions, mentor teams, ensure security, high availability, and quality, collaborate cross-functionally and support key customers.

This role involves designing and developing core modules for an enterprise-level clinical data platform, ensuring compliance with quality standards, and collaborating with teams for software development and testing.

Lead technical strategy for Dropbox's core systems and AI integration, drive technical outcomes, and influence multiple teams. Involve hands-on software development and architecture for scalable products.

Design and develop software applications for space systems, providing technical leadership and mentoring while ensuring high availability and security practices.

Lead the technical direction for a cross-functional pod, building cloud-native microservices and mentoring engineers while ensuring architectural integrity and operational efficiency.

Lead high-impact initiatives for a product platform, architecting security systems, mentoring engineers, and optimizing distributed infrastructures across teams.

The Principal Software Engineer will lead teams to enhance Gusto’s Payroll and Tax systems through design, implementation, and mentorship, ensuring quality and compliance across complex software solutions.

Lead and manage a software engineering team while spending ~75% time hands-on developing high-performance C/C++ embedded and SoC software. Design and optimize rendering, simulation frameworks, GUIs, and real-time systems compliant with DO-178C and DoD cybersecurity/RMF. Own integration, testing, CI/CD, program reviews, and customer-facing technical coordination for military AR training systems.

As a Principal Software Engineer on the SRE team, lead best practices adoption, mentor engineers, and improve system reliability and user experience through automation and collaboration.

The Principal Software Engineer will develop solutions in Java and Spring Boot, mentor teams, go through implementation goals, and communicate with customers and internal teams to enhance product quality and customer experience.

Lead the architecture and implementation of scalable, reliable services for DigitalOcean's PaaS offerings, mentor engineers, and drive technical direction.

Design, develop, and test software applications for space systems, providing technical leadership, mentoring engineers, and ensuring code quality and system scalability. Collaborate on innovative software solutions and manage code using version control systems.

The role involves building and optimizing a machine learning and simulation platform, supporting MLOps, model deployment, and infrastructure modernization, while mentoring engineers.

As a Principal Software Engineer, you will lead the development and architecture of Upstart's Core GenAI Platform, ensuring technical excellence and cross-team collaboration while mentoring junior engineers and influencing business strategy.

Lead the architectural design and development of a new consumer credit product, focusing on backend systems, distributed services, and integrating AI tools. Mentor team members and influence product direction through engineering insights.

The Principal Software Engineer will define technical roadmaps, guide system architecture, mentor leaders, and drive product direction in Capital Supply operations.

Lead design and operation of AI/ML platform, mentor engineers, ensure operational excellence, and collaborate on scalable technical roadmaps.

Lead full‑stack design and delivery of scalable, secure, cloud‑based software for image‑guided surgery and robotic systems. Own lifecycle from architecture through launch, mentor peers, collaborate cross‑functionally, and drive technical initiatives while ensuring testable, observable, and maintainable solutions.

Develop and maintain software for satellite operations, focusing on Java, Spring Boot, and React technologies. Collaborate with team members to support mission-critical projects.

The role involves leading backend software development, analyzing systems, participating in design and troubleshooting, and collaborating with teams to enhance cloud solutions.