Principal Product Engineer

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.

Our team is at the forefront of redefining the shopping research experience across Yahoo's global ecosystem. As a product‑minded engineering group, we specialize in integrating deep AI‑driven product insights and real‑time data directly into the user flow to create a more intuitive discovery journey. We operate with a collaborative, "scrappy" mindset – sitting at the intersection of design and code – to build high‑impact, frontend‑heavy solutions that power the next generation of e‑commerce across all of Yahoo's diverse verticals.

As a Principal Software Engineer, you are a technical heavyweight within the Commerce organization. You are the go‑to person for tackling our most complex engineering challenges and building frontend systems that reach hundreds of millions of users. You work at the sharp end of implementation, bridging the gap between sophisticated data and intuitive user interfaces. While you are a core part of the team, you operate with a high level of technical independence to leverage AI‑augmented workflows and deliver high‑impact code at an unprecedented pace.

• Technical Excellence: Design and implement complex, frontend‑heavy solutions that are scalable, high‑performing, and resilient across Yahoo's diverse commerce verticals.
• AI‑Driven Implementation: Deeply integrate AI‑driven product insights into user‑facing flows to create a seamless and personalized shopping research experience.
• AI‑Augmented Development & Quality: Master and implement AI‑assisted development workflows to rapidly prototype and ship major features, ensuring all AI‑generated code is expertly reviewed, validated, and optimized for the highest bar of quality, reliability, and performance.
• Design Integration: Partner closely with designers to translate creative visions into elegant, functional code, maintaining a "scrappy" mindset to solve frontend constraints.
• Hands‑on Problem Solving: Tackle the squad's most difficult technical bugs and performance bottlenecks, delivering elegant and user‑friendly engineering solutions.
• Technical Guidance:
  Act as a senior technical resource for the squad, sharing expertise in modern frameworks and experimenting with emerging AI tools to improve collective output.
• Product & Design Leadership: Proactively partner with Product Managers and Designers, providing strong technical and product opinions, and taking ownership of the end‑to‑end user experience and design integrity.

• Experience: 7+ years of professional software development experience, with a proven track record of shipping high‑impact code.
• Technical Mastery: Expert command of core web technologies (HTML, CSS, JavaScript, and Type Script) and modern frameworks (React, Next.js, Node.js), coupled with a deep understanding of the browser's rendering process, web performance, and application architecture.
• CS Fundamentals: Strong foundation in computer science, including data structures, algorithms, and clean software design.
• AI‑Forward Mindset & LLM Expertise: Demonstrated expertise in applying Large Language Model (LLM) technologies and AI‑assisted development tools to dramatically accelerate velocity and ensure high‑quality code. Must have a strong, positive, and curious outlook on the future of AI in engineering.
• Team
  
  Collaboration:
  
  Ability to work effectively in a high‑pressure, fast‑paced environment with a focus on empathy and collective success.
• Quality & Testing: Expert‑level experience with TDD and testing frameworks (Jest, Playwright) with a focus on utilizing AI to enhance test coverage.

• Vertical Expertise: Prior experience building high‑traffic e‑commerce or shopping research platforms.
• Advanced Integration:
  
  Experience with Graph
  
  QL, GCP/AWS, and implementing AI features into user‑facing frontend flows.
• Observability: Proficiency in monitoring tools such…