Top Principal Software Engineer Jobs in Denver & Boulder, CO

Lead architecture, design, and delivery of PET product features; write production full‑stack code; champion testing, observability, CI/CD and operational readiness; mentor engineers and collaborate with product to shape technical roadmap.

This role involves leading technical projects across multiple teams, designing scalable systems, collaborating with cross-functional teams, and mentoring engineers, focusing on payroll and tax systems at Gusto.

Lead architecture and development of modern, secure web administration UIs for Imprivata's Identity Configuration Platform. Drive front-end standards, build React/TypeScript applications, integrate with identity protocols (OIDC, SAML, OAuth), mentor engineers, collaborate with product/UX/backend teams, and improve performance, reliability, and maintainability within an Agile environment.

As a Senior Principal Engineer, you'll define and drive the technical strategy for customer experience platforms, lead architectural decisions, and mentor engineering teams to enhance customer and agent experiences.

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

The Principal Software Engineer designs, develops, and tests software for space systems. Responsibilities include coding, technical leadership, system architecture, and mentoring, while adhering to best practices and software development methodologies.

Lead long-term technical strategy and execution across multiple teams, architecting and evolving foundational frontend/backend systems and platforms at massive scale. Drive AI/ML adoption, solve ambiguous, high-impact problems, remain hands-on in critical system design and implementation, and align senior leaders on roadmaps and engineering standards.

Build and maintain a TypeScript/JavaScript SDK for IP video playback across web, smart TVs, and set-top boxes. Design clean APIs, implement video playback components (MSE/EME/DRM), optimize reliability and performance, collaborate with cross-functional teams, and support operations to ensure high-quality streaming for millions of users.

Lead design and implementation of scalable, cloud-native Java data platforms. Mentor teams, optimize data pipelines and canonical models, drive architecture and quality, collaborate with product and customers, and ensure high-performance, secure enterprise solutions.

Lead design and build of scalable backend systems and data platforms; own architecture and production deployments; improve reliability, performance, and observability; mentor engineers and collaborate with Product, Data Science, SRE, and Security.

Lead design and implementation of test automation and performance engineering for Streaming/OTT, STB, mobile, web, and backend API services. Build automation frameworks, create load/test strategies, analyze server-side performance with monitoring tools, manage CI/CD pipelines and environments, and mentor team members on automation, performance goals, and technical reviews.

Lead design and prototyping of generative AI experiences for autonomy development; drive UX for Hivemind products; perform user research, collaborate with CTO and product leads, and deliver reference implementations and integrations across full-stack web and edge systems.

The Principal Software Engineer will provide architectural guidance, mentor developers, manage risks, and ensure high-quality software production across various teams and product areas.

As Principal Software Engineer, you'll define and drive Airbnb's performance strategy, lead performance profiling development, mentor engineers, and connect performance outcomes to business objectives.

Lead the architecture of backend services and distributed systems for OpenAI's B2B engineering team, ensuring scalable, reliable, and secure products.

The role involves building robust software solutions, mentoring engineers, analyzing business problems, and contributing to technical strategy in a collaborative environment.

Lead design and reliability of a financial data extraction platform, minimizing human validation through AI, and enhance system correctness for scale.

Design, develop, integrate, deploy, and sustain satellite ground software across OS, platform, and mission layers. Build client/server services, command-and-control, mission planning, constraint checking, and 2D/3D visualization using C++, Python, Docker/Kubernetes, and cloud tooling. Work on Agile DevOps teams, produce architecture documentation, and support integration with PKI and message-bus systems for mission-critical space operations.

Hands-on Principal engineer who designs, builds, and operates production-grade Azure solutions with strategic customers; develops an observability-focused Azure service, supports live production via on-call and incident response, creates reusable tooling and reference implementations, and drives platform improvements while mentoring field engineering teams.

Lead design and delivery of scalable, secure full-stack systems; mentor engineers; integrate AI-driven and agent-based workflows; ensure cloud-native, containerized deployments and secure SDLC practices.

Design, develop, and maintain Java/Spring applications and responsive web front ends (HTML, XML, JavaScript). Deploy and troubleshoot software across Windows and Unix/Linux, automate builds and CI/CD with Maven, Git, Ansible and Bash. Work on-site at Schriever SFB in a defense environment, collaborate with cross-functional teams, follow security best practices, and maintain required DoD certifications and clearances.

Lead a systems infrastructure engineering team managing Linux (RHEL/CentOS) and Windows servers, VMware vSphere, automation (PowerShell, Python, Ansible), enforce cybersecurity compliance (SCAP/STIG/Nessus), maintain configuration management (Team Center Enterprise), follow Agile processes, and travel ~25%. Requires active Secret clearance.

Drive architecture, design, and implementation of large-scale software systems. Lead technical strategy, mentor engineers, collaborate cross-functionally, ensure code quality and operational reliability, and guide delivery of complex features and platform improvements.

Lead architecture and implementation of large-scale, elastic Pub/Sub and messaging services. Define scalable, reliable designs, mentor engineers, drive CI/CD and testing strategies, manage incidents, partner with PMs/EMs, and advance AI tooling across the SDLC to enable real-time analytics and integrations.

Lead design and implementation of highly scalable, secure backend services and APIs. Define architecture for databases and microservices, own projects end-to-end, resolve reliability/performance issues, improve CI/CD and observability, mentor engineers, and align technical strategy with product and security requirements.