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. A Little About Us 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. About the Role 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 un [... source excerpt omitted ...] 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. Minimum Qualifications 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 TypeScript) 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 [... source excerpt omitted ...] ollective success. Quality & Testing: Expert-level experience with TDD and testing frameworks (Jest, Playwright) with a focus on utilizing AI to enhance test coverage. Preferred Qualifications Vertical Expertise: Prior experience building high-traffic e-commerce or shopping research platforms. Advanced Integration: Experience with GraphQL, GCP/AWS, and implementing AI features into user-facing frontend flows. Observability: Proficiency in monitoring tools such as Splunk, Datadog, or Prometheus. Mindset: A product-focused approach to engineering with a commitment to using AI as a tool to maximize personal and team impact. The material job duties and responsibilities of this role