Senior Full Stack Software Engineer - AI First

Senior Full Stack Software Engineer- AI-First

It takes powerful technology to connect our brands and partners with an audience of hundreds of millions of people. Whether you're looking to write mobile app code, engineer the servers behind our massive ad tech stacks, or develop algorithms to help us process trillions of data points a day, what you do here will have a huge impact on our business-and the world.

We are seeking a Senior Full Stack Engineer who is ready to build the next generation of secure, scalable Identity systems. As a Senior Professional, you possess specialized depth in full-stack architecture and a commitment to modern, AI-augmented engineering practices. You are a systems‑thinker who thrives in an "AI-First" environment, where you act as both an architect and a validator of high-quality code.

You possess an openness to experimentation and a focus on using structured specs to drive massive impact across the Identity ecosystem.

• Design, build, and operate high-scale Identity systems (React, Type Script, Java/Node) with a focus on security and global availability.
• Orchestrate an AI-first workflow, utilizing Spec-Driven Development (SDD) and AI-assisted tools (e.g., Code Whisperer Professional) to accelerate implementation while maintaining architectural integrity.
• Identify and implement AI-driven efficiencies in the development lifecycle, replacing manual testing and boilerplate generation with automated, AI-validated workflows.
• Own complex features end‑to‑end, from initial requirements and system design to production monitoring and operational excellence.
• Improve system reliability and performance by identifying systemic bottlenecks and proactively suggesting AI-assisted diagnostics or optimizations.
• Mentor engineers across the squad, raising the bar for engineering standards and scaling AI-first best practices through peer reviews and design sessions.
• Exercise judgment in balancing AI-generated outputs with manual oversight, ensuring all implementations meet Yahoo's rigorous security and performance standards.

• 5-8 years of full stack development experience with React, Type Script, and Java/Node.
• Strong fundamentals in system design, APIs, distributed systems, and modern web technologies.
• Proven expertise in prompt engineering and structured interaction with AI tools to drive software implementation.
• Demonstrated ability to independently lead and deliver complex, multifaceted features in a production-grade environment.
• Deep experience with testing frameworks and a track record of maintaining high-quality, secure codebases.
• Commitment to evaluating and refining AI-generated outputs, ensuring the detection of errors, hallucinations, or security vulnerabilities.

• Experience with identity/auth systems (OAuth, OIDC, SAML, or FIDO).
• Cloud platform experience (GCP, AWS, or Azure).
• Experience with Spec-Driven Development (SDD) or structured engineering workflows using tools like Claude Code or Copilot.
• Familiarity with CI/CD, observability (Splunk/Grafana), and performance optimization at scale.
• Exposure to accessibility (a11y), internationalization (i18n), or large-scale consumer systems.

• Consistently deliver high-quality, scalable systems with strong ownership and minimal supervision.
• Significantly increase team velocity by successfully integrating AI-augmented oversight into daily engineering tasks.
• Raise the engineering standard across the team by mentoring others in AI-first and SDD practices.
• Proactively improve team productivity through the optimization of AI workflows and structured implementation specs.

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.…