Sr. Frontend Engineer

San Francisco, CA

About the role
A San Francisco-based startup is looking for a Sr. frontend engineer to build and improve its digital platform. You'll create interactive user interfaces, set engineering standards, and deliver work that impacts users immediately. This role offers a chance to shape the frontend foundation while contributing to a fast-growing team.

Key Responsibilities

• Own the development of user interfaces from concept to deployment, including ongoing maintenance and monitoring.
• Establish and maintain standards for component architecture, coding quality, and testing practices.
• Mentor colleagues and introduce reusable frontend patterns and best practices.
• Collaborate with stakeholders and end users to clarify requirements and translate designs into production-ready applications.
• Develop responsive web applications using modern frameworks and languages, including React, TypeScript, and contemporary styling systems.
• Write maintainable, well-tested code that scales with the platform.
• Make strategic decisions about data flow, application state, and component structure.
• Work efficiently in a fast-paced environment, balancing speed with quality and user-centered design.

Requirements

• Have 3-6 years of experience delivering frontend systems, particularly in product-focused environments.
• Demonstrate the ability to turn visual designs into accessible, production-ready applications.
• Be deeply interested in user experience, interface design, and product impact-not just code implementation.
• Possess a track record of independently leading substantial projects such as component libraries, feature modules, or performance improvements.
• Serve as a technical reference within the team and contribute to defining frontend strategy.
• Mentor and elevate the skills of other team members.
• Thrive in environments with ambiguous requirements and provide thoughtful, product-minded solutions.

Technical Skills

Core Frontend:

• React, TypeScript, Next.js
• Modern CSS frameworks and component libraries
• Implementation of design workflows from visual tools to code

Data & State Management:

• Application state handling and API integration
• Optimization of rendering and performance

Quality & Reliability:

• Testing frameworks and end-to-end validation tools
• Emphasis on maintainable, scalable code

System & Design Thinking:

• Reusable component strategies and inclusive design principles
• Peer reviews, knowledge sharing, and establishing technical patterns

Preferred Attributes

• Experience as an early engineer or in high-growth startup environments.
• Built shared component ecosystems or internal UI libraries.
• Led frontend technical strategy or guided team practices.
• Worked with analytics or tracking systems to inform product decisions.
• Developed internal tools such as dashboards, admin panels, or operational interfaces.
• Partnered closely with design professionals throughout product development.
• Comfortable with iterative releases and experimental approaches.
• Interest in emerging technologies such as AI, digital commerce, or automation.
• Contributions to personal projects, open source, or community code initiatives.