Principal Full-stack Engineer - AI Tooling

Yahoo serves as a trusted guide for hundreds of millions of people globally, helping them achieve their goals online through our portfolio of iconic products. For advertisers, Yahoo Advertising offers omnichannel solutions and powerful data to engage with our brands and deliver results.

Yahoo is seeking a Principal Engineer with a strong full‑stack background and exceptional skills in backend architecture, APIs, automation, and infrastructure. In this pivotal role, you’ll drive the end‑to‑end development of critical tooling, backend services, APIs, and internal systems to enhance Yahoo’s design system. Your work will enable cross‑team efficiency and elevate developer productivity across multiple squads.

• Developing comprehensive end‑to‑end tooling, APIs, automation systems, and backend infrastructure.
• Building robust backend services using Node.js, Type Script, and Postgre
  
  SQL.

• Design, develop, and maintain scalable backend services, ensuring reliability and performance.
• Build and evolve APIs, command‑line interfaces (CLI), and internal developer tools that streamline system interactions.
• Implement and maintain automation pipelines to accelerate development workflows and reduce manual overhead.
• Manage and enhance infrastructure services including databases, cloud hosting, logging solutions, and system monitoring metrics.
• Contribute significantly to configuration management systems and integrations with cutting‑edge AI tooling.
• Closely collaborate with UI engineers, effectively bridging backend logic with front‑end applications to deliver seamless user experiences.

• Familiarity with React.js and front‑end development concepts.
• Extensive experience with backend development, primarily Node.js and Type Script.
• Proficiency with Postgre
  
  SQL or comparable relational databases.
• Deep understanding of RESTful API design and development.
• Demonstrated expertise in building automated CI/CD pipelines and scripting.
• Experience with cloud infrastructure management (AWS, Azure, or GCP).
• Strong competency in system architecture, particularly in high‑availability environments.
• Solid background integrating AI tooling or configuration systems is highly preferred.

• Interest and experience in exploring and integrating artificial intelligence (AI) solutions to enhance tooling and automation systems.
• Expert‑level knowledge in backend architecture, APIs, and tooling.
• Proven ability to support and enable multiple cross‑functional squads.
• High‑impact contributions to system performance optimization, automation efficiency, and developer experience enhancements.
• Exceptional problem‑solving, communication, and technical leadership capabilities.

The material job duties and responsibilities of this role include those listed above as well as adhering to Yahoo policies; exercising sound judgment; working effectively, safely and inclusively with others; exhibiting trustworthiness and meeting expectations; and safeguarding business operations and brand integrity.

At Yahoo, we offer flexible hybrid work options that our employees love! While most roles don’t require regular office attendance, you may occasionally be asked to attend in‑person events or team sessions. You’ll always get notice to make arrangements. Your recruiter will let you know if a specific job requires regular attendance at a Yahoo office or facility. If you have any questions about how this applies to the role, just ask the recruiter!

Yahoo is proud to be an equal‑opportunity workplace. All qualified applicants will receive consideration for employment without regard to and will not be discriminated against based on age, race, gender, color, religion, national origin, sexual orientation, gender identity, veteran status, disability or any other protected category. Yahoo will consider for employment qualified applicants with criminal histories in a manner consistent with applicable law.

Yahoo is dedicated to providing an accessible environment for all candidates during the application process and for employees during their employment. If you need accessibility assistance and/or a reasonable accommodation due to a disability,…