Staff Frontend Engineer, Growth Monetization Web

Block is one company built from many blocks, all united by the same purpose of economic empowerment. The blocks that form our foundational teams — People, Finance, Counsel, Hardware, Information Security, Platform Infrastructure Engineering, and more — provide support and guidance at the corporate level. They work across business groups and around the globe, spanning time zones and disciplines to develop inclusive People policies, forecast finances, give legal counsel, safeguard systems, nurture new initiatives, and more. Every challenge creates possibilities, and we need different perspectives to see them all. Bring yours to Block.

The Role

We are on a mission to make commerce easy and accessible for businesses of all sizes. The Monetization team plays a critical role in this mission by increasing the adoption and utilization of Square’s products. Whether it’s through smarter pricing experiences, plan comparisons, or in-app upgrade paths, our work helps Sellers grow and enables success in driving business outcomes. 

As a Staff/Principal Frontend Engineer, you’d lead initiatives to build elegant, user-friendly, and accessible experiences that directly influence product adoption and monetization. You’ll join a thoughtful and collaborative team where product, data, design, and engineering work closely to deliver high impact outcomes. You’ll lead the charge in crafting reusable components, driving architectural decisions, and mentoring others. You’ll have the opportunity to directly influence pricing strategy, drive meaningful business outcomes, set the standards for technical excellence and help scale a world-class frontend engineering culture. This is a hands-on engineering role for someone who enjoys writing code, building elegant and impactful user experiences, and partnering closely with product, design, and other teams to bring new experiences to life.

You Will

• Design and implement complex, user-facing features and frontend architectures that scale.
• Build and scale React-based applications with high standards for performance, maintainability, and accessibility.
• Lead critical engineering initiatives that impact product monetization, conversion, and feature adoption.
• Define the technical strategy and raise the standards on best practices across front-end architecture, performance, accessibility, testing and maintainability.
• Collaborate with cross-functional teams to rapidly prototype and iterate on ongoing initiatives.
• Drive the deprecation of legacy frameworks like Ember, helping modernize our stack.
• Prioritize and advocate for tooling and platform investments that improve engineering velocity and system extensibility.
• Explore and apply emerging technologies, including AI-assisted automations to enhance our development workflows.
• Mentor engineers across the organization, fostering a culture of technical excellence, inclusion, and high-velocity execution.

You Have

• 12+ years of industry experience building for the Web, with a proven record of successfully delivering large multi-year features.
• Deep expertise in React and modern frameworks with experience building and maintaining large-scale React applications.
• Hands-on experience in building high-quality, reusable components and production-level interfaces at scale.
• Proven ability to lead large projects with strong collaboration, communication, and ownership while working cross-functionally with multiple stakeholders.
• Deep experience in operational excellence and frontend system health including leading and setting org-wide reliability standards.
• The ability to define technical north stars and serve as a culture carrier for engineering quality and inclusive collaboration.
• Curiosity about emerging technologies and their practical applications in system workflows.

Even Better

• Experience leading frontend architecture for platform-wide components or frameworks.
• History of driving org-level technical migrations or architectural transformations.
• Significant experience working with component libraries and design systems.
• Familiarity with A/B testing and experimentation tooling.
• Understanding of business and growth metrics, with the ability to translate them into UX and engineering strategies.
• Strong commitment to web accessibility and experience implementing accessibility guidelines in applications
• Familiarity with GraphQL, Redux (or similar state management libraries), and component systems like Storybook.
• Previous work in SaaS, subscriptions, or pricing applications would be a plus.

Technologies We Use and Teach

• Languages: TypeScript/JavaScript (Primary), Java
• Frameworks & Core Technologies: Next.js, React, Ember, Svelte, Node.js
• APIs & Communication: gRPC, REST, Protocol Buffers, GraphQL
• Experimentation: Optimizely, LaunchDarkly
• Testing: Jest, Playwright
• Tools: Remix, React Router, Vite, React Query, Snowflake, Sentry, Datadog

We're working to build a more inclusive economy where our customers have equal access to opportunity, and we strive to live by these same values in building our workplace. Block is an equal opportunity employer evaluating all employees and job applicants without regard to identity or any legally protected class. We will consider qualified applicants with arrest or conviction records for employment in accordance with state and local laws and "fair chance" ordinances. We believe in being fair, and are committed to an inclusive interview experience, including providing reasonable accommodations to disabled applicants throughout the recruitment process. We encourage applicants to share any needed accommodations with their recruiter, who will treat these requests as confidentially as possible. Want to learn more about what we're doing to build a workplace that is fair and square? Check out our I+D page.