Top Principal Software Engineer Jobs in Denver & Boulder, CO

The Principal Software Engineer at Snout will define architectural direction, build features across the stack, and enhance team effectiveness, ensuring quality and performance.

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.

Lead technical strategy and hands-on development of HubSpot's build, test, and deploy platform. Design scalable CI/CD, test orchestration, and AI-powered QA agents, drive architectural decisions, remove pipeline bottlenecks, and deliver cross-team initiatives that increase deployment velocity and reliability for thousands of engineers.

Lead reliability, availability, and resiliency strategies for large-scale systems, drive operational excellence, and provide technical mentorship across engineering teams.

Lead the integration and testing of payload hardware, develop and document software systems, and mentor junior engineers in a collaborative team environment.

Lead and architect large-scale software test campaigns for complex aerospace systems. Design test plans, automated frameworks, CI/CD-based workflows, and verification/qualification tests. Mentor engineers, manage defect lifecycle, coordinate cross-functional stakeholders, and drive testing strategy, continuous improvement, and quality for mission-critical software.

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.

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.

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

Develop and maintain advanced security software solutions, architect AI-enhanced microservices, and lead project teams for threat protection at GoDaddy.

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.

Lead technical direction and strategy for advanced aerospace software systems. Oversee major projects, mentor engineers, conduct code reviews, define requirements, ensure performance and regulatory compliance, and drive continuous improvement across multidisciplinary teams.

Lead technical direction and architecture for advanced aerospace software systems. Mentor teams, manage major projects, enforce code quality, define requirements, drive performance improvements, and represent engineering in strategic decisions.

The Principal Software Engineer leads the design and development of scalable software solutions, mentors engineers, and drives architectural decisions while collaborating with cross-functional teams.

Lead development of ground and flight software for lunar and deep-space missions, manage full software development lifecycle, and mentor engineers.

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.

Design and develop web applications, mentor teammates, shape architectural decisions, write clean code, conduct testing, and troubleshoot issues.

The Principal Software Engineer will lead the development of Node-based applications, ensuring alignment with business goals and mentoring engineers. Responsibilities include designing scalable systems, managing product requirements, and utilizing AI tools for software development.

Analyze and optimize system performance, develop solutions, extend metrics collection, build performance tools, and provide training across teams.

Lead design, development, maintenance, and testing of complex software systems for a U.S. Government customer. Provide technical expertise, resolve defects, perform requirements analysis, and guide architecture and hardware/software trade-offs.

Design and deliver end-to-end architecture and implementation for Fixed Income trading systems, reporting and analytics integrations, tests, CI/CD, and resilient distributed systems. Mentor engineers and promote modern, efficient system and code paradigms to boost developer productivity and reliability.

Lead development and optimization of high-performance LLM inference pipelines across data center, edge, and embedded platforms. Improve latency and throughput via custom CUDA kernels, quantization, KV-cache and batching strategies, and deploy efficient, production-ready runtimes without external vendor dependency.

Build and evolve server and agent tool surfaces for LLM clients, ship frontend features and tRPC/React routes, design public API layer with auth and rate limiting, integrate new data sources, and own performance, reliability, security, and observability end-to-end.