Senior Frontend Engineer, Growth Acquisition

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

As a Senior Frontend Engineer and one of the team's technical leads focusing on Web for Growth Acquisition, you'll help drive the strategy and vision for Acquisition, overseeing architecture, technical direction, and quality standards. You will play a pivotal leadership role—combining hands-on technical contribution with strategic influence over how the team builds scalable, performant, and impactful acquisition experiences. You'll collaborate closely with Product, Marketing, Design, and Data, contributing to shared platforms and advocating for best practices across multiple cross-functional squads.

This is a remote position, open to all US and Canada locations. 

You Will

• Lead the design, implementation, and delivery of large-scale, user-facing features across the Acquisition funnel, predominately using Svelte and Node.js.
• Own the technical direction, setting standards for scalability, accessibility, reliability, and maintainability across web initiatives.
• Define and evolve the frontend architecture for Acquisition, including design system integration, platform capabilities, and shared component libraries that enhance developer productivity and ensure consistency across the platform
• Collaborate across Marketing, Product, Design, and Data to optimize seller acquisition experiences and turn analytics insights into growth-driving features
• Guide team-level experimentation, AB testing, and conversion funnel instrumentation to help optimize seller acquisition.
• Oversee and improve frontend quality via code reviews, hands-on mentorship, and platform-wide infrastructure; champion high standards for technical excellence and documentation.
• Participate and lead incident response, root cause analysis, and operational improvements to drive reliability and observability.
• Explore and apply emerging technologies—such as AI-assisted engineering tools—to boost team velocity and product impact.
• Mentor and coach junior and mid-level engineers, supporting their growth and ensuring a healthy engineering culture.
• Foster a culture of inclusion, psychological safety, and high performance within the team. 

You Have

• 8+ years of professional experience with JavaScript/TypeScript and modern web frameworks (e.g., Svelte, React).
• Expertise in designing and operating large-scale web applications and reusable component systems.
• Proven experience leading complex projects and driving technical strategy and collaboration across cross-functional teams.
• Deep knowledge of frontend performance, accessibility, observability, and operational excellence.
• Strong development and leadership skills in component-driven architecture and design-system tooling.
• Advanced communication skills and experience fostering collaboration in fast-paced environments.
• Familiarity with frontend deployment pipelines, cloud infrastructure, and CI/CD practices.
• Awareness of experimentation platforms (e.g., Optimizely, LaunchDarkly), A/B testing, and data-driven product optimization.
• Comfortable with modern tooling: TypeScript, JavaScript, Svelte, React, Node.js, GraphQL, REST/gRPC, Storybook, Datadog, Sentry, Vite.
• Curiosity for emerging technologies and a pragmatic approach to innovation. 

Even Better

• Experience in SaaS or subscription-based, acquisition-focused products, with a focus on funnel optimization and growth engineering. 
• Experience building and evolving shared UI libraries, frameworks, or platform-wide components.
• Familiarity with data analysis, advanced SQL, and translating experimentation results into engineering outcomes.
• Prior leadership in web platform or infrastructure projects supporting multiple cross functional teams.
• Prior experience working with web platforms backed by 3rd party CMS.

Technologies We Use and Teach

• TypeScript, JavaScript, Svelte, React, Node.js, GraphQL, REST/gRPC, Storybook, Datadog, Sentry, Vite