Top Principal Software Engineer Jobs in Denver & Boulder, CO

The role involves leading initiatives for vector search in Elasticsearch, enhancing features, resolving bugs, and contributing to community engagements in a distributed team setting. A strong background in vector similarity and Java is crucial.

Lead technical direction and hands-on execution for major software products and systems. Design scalable architectures across backend, frontend, APIs, databases, and infrastructure; write code; drive architecture decisions; solve production issues; improve testing, security, observability, and development practices; lead critical initiatives; and mentor engineers across distributed international teams.

Provide technical leadership designing, building, and operating production-grade developer platforms to improve software validation and release confidence. Drive platform modernization, large-scale migrations, and cross-team architectural change while contributing hands-on and mentoring senior engineers.

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 execution for a large-scale AWS data lake supporting government operations. Manage and mentor 45+ engineers, translate architecture into delivery plans, establish engineering standards and DevOps practices, oversee APIs and distributed systems, drive automated testing and Kubernetes deployments, manage technical debt and risks, and engage government customers and subcontractors in classified environments.

The Principal Software Engineer will embed with product teams to solve complex technical problems, deliver production code, and make application and service-level architectural decisions. The role owns shared services, reliability, performance, incident response, and cross-system issue diagnosis. It also leads solution design, mentors engineers through influence, supports multiple products and domains, and establishes effective standards for AI-assisted software development.

Lead design and implementation of core platform infrastructure for an Agentic AI platform. Build high-performance Rust systems, support production deployments, collaborate with ML engineers, design scalable data architectures, troubleshoot performance and scalability issues, and cultivate a collaborative, inclusive engineering culture.

Senior software engineer responsible for Java/J2EE development for C2BMC regional applications. Duties include design, coding, testing, integration, debugging, automation tools, mentoring junior engineers, and supporting enterprise Linux-based systems using modern build/version tools and Agile practices.

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

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 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.

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.

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.

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, 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.

Develop and support complex software systems for the C2BMC missile defense program. Responsibilities include software design, coding, testing, debugging, integration, systems engineering, requirements decomposition, interface development, use-case and sequence modeling, documentation, user support, and technical problem resolution. The role collaborates with systems and specialty engineers in an Agile environment and requires active Secret clearance and on-site work in Colorado Springs.

Develop, integrate, deploy, and sustain satellite ground software for command and control, mission planning, constraint checking, and 2D/3D visualization. Build full-stack client and server applications across operating system, platform, and mission-specific layers using C++, Python, Docker, Kubernetes, and related technologies. Produce software architecture documentation, support Agile DevOps programs, integrate hardware interfaces, and make decisions within project budget and schedule constraints. The role is onsite in Colorado Springs and supports classified space-sector missions.

Architects and develops secure, high-performance distributed applications, APIs, microservices, and data pipelines on AWS. Leads application architecture, cloud infrastructure, data governance, testing automation, CI/CD, security, performance optimization, and technical modernization. Coordinates complex project lifecycles, manages risks and schedules, advises management, resolves cross-functional technology issues, documents systems, and mentors junior engineers in a financial services environment.

Lead the technical vision and development of Elasticsearch’s core search infrastructure, including indexing, retrieval, query execution, and relevance. Research advances in search systems and algorithms, guide long-term technical roadmaps, collaborate across teams, mentor expert engineers, and contribute hands-on to high-performance distributed software. Serve as a subject-matter authority while driving projects from concept through completion.

Build and scale Xbox growth experiences across console, web, and mobile through full-stack engineering and data-driven experimentation. Responsibilities include proposing product hypotheses, designing A/B tests, implementing telemetry and analytics, shipping reliable services and client features, analyzing results, participating in on-call rotation, using AI-enhanced workflows, mentoring engineers, and driving experiments that improve retention and daily active users.

Define scalable SaaS architecture and technical direction while remaining hands-on in software development. Design APIs, integrations, security, and modernization roadmaps; establish engineering standards and DevSecOps practices; write production code; lead architecture and code reviews; coordinate development and QA teams; and ensure secure, accessible, compliant platform delivery.

Develops, tests, documents, enhances, and maintains software solutions using established design principles and technical standards. Reviews systems, resolves defects, remediates security vulnerabilities, improves performance, analyzes user stories, and implements business solutions. Participates in software development processes, stays current with technology, mentors engineers, and helps plan and prioritize team development work.

Leads software design, development, testing, architecture, and delivery across multiple mission-critical projects. Provides technical direction, code reviews, escalation support, and hands-on development in a rapid prototyping environment. Establishes standardized software practices, tools, workflows, and secure development processes across teams. Builds cloud-native applications, microservices, APIs, event-driven systems, and CI/CD pipelines using Kubernetes, Kafka, and DevSecOps tools while collaborating with technical leaders and stakeholders.