Principal Frontend Web Engineer, Yahoo Mail

Yahoo Mail is the ultimate consumer inbox with hundreds of millions of users. It’s the best way to access your email and stay organized from a computer, phone or tablet. With its beautiful design and lightning fast speed, Yahoo Mail makes reading, organizing, and sending emails easier than ever.

 A little about us:

The client experiences team develops products for Yahoo Mail on Android, iOS, and Web used by over 220 million users across 40 countries and 70 languages. Yahoo Mail continues to be one of the largest and most recognizable email services in the world. Delivering over 4.5B emails daily, and with consistently top-rated mobile apps, Yahoo Mail is a critical pillar in the company’s long-term growth strategy. You will join a team of engineers who strive to deliver our users the best consumer mail experience and are willing to meticulously refine the details to achieve this goal.

A lot about you:

We are seeking a Principal Software Web Engineer who will lead the next generation of communication products on the web and set the technical direction for how our team builds in an AI-First world. As a Principal, you will operate as both an architect and a validator of high-quality code. You will orchestrate AI-assisted workflows to accelerate delivery while maintaining the architectural judgment, security posture, and user experience that millions of users rely on. You have a deep commitment to modern web stacks, cloud-scale systems, and pushing the team toward structured, AI-augmented engineering practices. You enjoy mentoring engineers, exploring new technology, and turning rough ideas into elegant, production-grade products. If you care about code quality, architecture, design, and user experience and treat AI as a force multiplier rather than a replacement for engineering rigor, we want to talk to you.

Responsibilities:

• Feature Leadership & Delivery: Define, design, develop, and ship major new features in current and future web products, owning them end-to-end from requirements through production monitoring.

• AI-First Workflow Orchestration: Leverage approved AI-assisted tools (such as Cursor and Claude Code) to accelerate implementation while maintaining architectural integrity, code quality, and security.

• Lifecycle Optimization: Identify and implement AI-driven efficiencies across the development lifecycle, replacing manual boilerplate and repetitive refactors with automated, AI-validated workflows.

• Technical Judgment & Oversight: Balance AI-generated outputs with manual oversight, reviewing generated code for architectural correctness, performance, and adherence to strict accessibility and security standards.

• High-Scale Impact: Take ownership of web application areas impacting millions, tackling hard engineering and UX problems with elegant, seamless solutions.

• Quality & Collaboration: Perform thorough code reviews and collaborate with UX designers and product managers to deliver platform improvements and critical bug fixes.

• Operational Excellence: Write testable, reliable code and deploy, monitor, and operate large-scale production web systems distributed across the globe.

• Mentorship & Innovation: Mentor engineers across the squad and adjacent teams to scale AI-first best practices, establishing guardrails for AI-augmented coding, and evaluating emerging tooling to keep Yahoo at the leading edge.

Qualifications:

• BS in Computer Science (or equivalent) with 8+ years of professional software engineering experience (or equivalent years of experience)

• Strong understanding of the fundamentals including Data Structures, Algorithms, and Software Design

• Deep technical knowledge of responsive design and modern JavaScript frameworks (e.g., React, Angular) and Node.js

• Expertise in web application development with a strong command of browser-side technologies including HTML5, CSS3, TypeScript, and OOP JavaScript

• Proven expertise in software development principles, including design patterns, CI/CD, and deployment architecture

• Experience with modern web technologies like Webpack, Redux Toolkit, Atomic CSS, Storybook, and REST APIs

• Expertise in test-driven development and frameworks such as Jest, Selenium, Playwright, and React Testing Library

• Expert knowledge of web application performance, stability, and debugging

• Hands-on experience with approved AI code-assist to