Top Principal Software Engineer Jobs in San Francisco, CA

The Principal Software Engineer will define architecture for high-performance infrastructure, optimize RL environments, and turn prototypes into scalable systems, while resolving technical challenges.

Lead architecture and technical direction for Ruby on Rails and React systems, design scalable APIs and front-ends, own services/databases/infrastructure (MariaDB, Redis, Elasticsearch), use Kubernetes for scaling, integrate AI-assisted development workflows, mentor engineers, and deliver secure, well-tested production releases.

As a Principal Software Engineer, you will design and implement secure embedded finance products, enhance platform architecture, and integrate AI tools in a fast-paced fintech environment.

As a Principal Software Engineer, you will architect and develop software managing a satellite mesh network, focusing on real-time operations, low-latency performance, and system resilience.

Lead the design and implementation of high-performance PoP infrastructure, optimize networking software, and mentor engineering teams at Blue Origin.

As a Principal Software Engineer at Blue Origin, you'll lead intra-satellite networking software development, bridging hardware and software for a global satellite constellation. Responsibilities include defining technical strategies, leading design implementations, and troubleshooting system performance in dynamic environments.

The role involves leading technical initiatives in automating network engineering for Elastic's infrastructure, developing cloud network solutions, and collaborating in a team-focused environment to enhance platform reliability.

The Principal Software Engineer will architect and implement video processing pipelines, focusing on AI-native video intelligence. Responsibilities include codec mastery, streaming ingestion, design of storage systems, and collaboration with ML teams for video preprocessing.

As a Principal Software Engineer, you will lead and develop innovative technology solutions for the banking industry, focusing on Calypso platforms, Agile methodologies, and software development best practices.

The Principal Software Engineer will lead the modernization of seller applications, set technical strategy, and mentor engineers while driving architecture and engineering practices in a cloud-native environment.

Lead the development of a robotics data platform, focusing on data enablement, API architecture, and mentoring engineers in complex system designs.

As a Principal Software Engineer, you will lead the Containers team to develop features, improve tooling, maintain quality, and mentor engineers while shaping technical direction for Chainguard Images.

Design and evolve perception architecture for autonomous products, integrating sensing technologies, and leading cross-functional teams on AI and performance metrics.

The role involves designing and developing secure software solutions, focusing on innovative sensor technology for Linux environments, and enhancing customer adoption through collaboration.

Design and develop scalable features for secure software. Advocate for quality standards and engage with customers. Work remotely with a focus on product improvement.

The Principal Software Engineer will build systems for safe software deployment, enhance developer frameworks, and ensure reliability in code delivery.

Design, develop, and maintain scalable software solutions. Collaborate with teams to troubleshoot issues and enhance the software delivery lifecycle. Focus on backend services, using Java and various tools for performance optimization.

As a Principal Software Engineer at Vanta, you'll lead engineering initiatives for the Governance, Risk, and Compliance product, mentor teams, and drive significant business impact through strategic technical direction and infrastructure development.

The Principal Software Engineer will lead D2C Growth initiatives at Aura, shaping customer acquisition strategies and mentoring engineering staff while designing innovative optimization and personalization platforms.

Design and develop scalable backend systems for SaaS applications, mentor engineers, and lead projects while collaborating with cross-functional teams.

The Principal Software Engineer leads technical standards and product design in a collaborative hybrid environment, focusing on complex software solutions, cloud services, and mentoring teams.

As a Principal Software Engineer, you'll own platform-scale initiatives, shape AI direction, ensure reliability in distributed systems, and mentor others.

The Principal Software Engineer will lead AI-powered feature development, manage complex software projects, and drive the migration from Java to Go while coordinating with a remote team.

The Principal Machine Learning Engineer will design and scale ML systems for personalization and search, mentor engineers, and lead major ML initiatives at Fetch.

As a Principal Software Engineer at Fetch, you'll design scalable systems for user engagement, drive experimentation, lead technical strategy, and mentor teams to improve engineering productivity and system reliability.