Top Principal Software Engineer Jobs in San Francisco, CA

Seeking a Principal Software Engineer to build developer products for LLM applications, ensuring high-quality tools and APIs while leading engineering practices and collaborating across teams.

As a Senior/Principal Software Engineer in AI Enablement, you'll design and develop scalable AI/ML systems, collaborate with scientists and product managers, and optimize data-driven workflows.

The Principal Software Engineer will provide technical and architectural leadership in data engineering, focusing on strategy, innovation, and ensuring successful production deliveries while fostering teamwork and mentoring.

As a Principal Software Engineer, you'll lead complex projects, build scalable systems, and integrate EHRs while driving technical improvements and collaborating with cross-functional teams.

The Principal Software Engineer designs and enhances software applications using Appian, providing technical leadership and ensuring alignment with enterprise standards in a healthcare environment.

Design and build AI-first data systems, focusing on architecture, developer experience, and cross-stack execution while mentoring engineers.

The Principal Software Engineer will lead technical initiatives, develop scalable solutions, mentor teams, and drive system architecture for a connected equipment platform.

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

The role involves enhancing vector similarity search in Elasticsearch, leading initiatives, implementing new features, and collaborating with a distributed team.

Lead the development of automation systems for hardware design, implementing innovative solutions, integrations, and APIs while fostering engineering best practices.

Lead the design and implementation of full-stack solutions while mentoring junior engineers and driving agile development practices within the organization.

Design and build open-source Pulumi SDKs, ensure code quality, lead projects, and contribute to the developer community.

As an iOS Software Engineer, improve the iOS app infrastructure, streamline processes, and maintain app releases while mentoring junior engineers.

Lead architectural vision and development of scalable infrastructure for self-driving technology, mentoring engineers and overseeing complex projects.

As a Principal Software Engineer, you will architect WEX's Data-as-a-Service platform, set standards, guide strategy, and mentor teams while driving innovation with modern technologies.

The Principal Software Engineer will lead technical direction, mentor engineers, and oversee project execution while implementing backend services in Python and React frontends. Responsibilities include driving innovation, shaping architecture, maintaining high engineering standards, and contributing to the operational lifecycle of features.

Lead the design and implementation of mortgage technology features, mentor engineers, and collaborate across teams to improve customer experiences.

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

The Technical Director, MLE will lead AI projects, enforce MLOps practices, mentor teams, and architect scalable cloud solutions to enhance data integrations.

As a Principal Software Engineer, you'll build and deploy ChatGPT for Work, enhancing productivity through new features and tooling while ensuring system reliability.

Lead the technical development of machine learning algorithms for the ML Planner, collaborating across teams to influence autonomous technology direction.

As a Principal Software Engineer, you'll lead a team on the development of cloud identity solutions, mentor engineers, and ensure high quality in software design and implementation.

The Principal Software Engineer will lead AI integration into production, shape technical direction, mentor engineers, and ensure system reliability, working with full stack technologies.

The Principal Software Engineer II will lead and contribute to Elasticsearch's Storage Engine team, focusing on efficient data querying, indexing, and developing Timeseries solutions. This role requires strong technical leadership, collaboration across teams, and expertise in Java and Elasticsearch.

The Principal Software Engineer will maintain and enhance cross-platform GUI applications, develop Python APIs, manage CI/build systems, and oversee AWS infrastructure for M-Star's CFD software, contributing to scientific innovation across multiple industries.