Frontend Engineer

Madrona Venture Labs; San Francisco (CA); On-site; USD 120,000 - 160,000; Full time

Job summary

Madrona Venture Labs is looking for a Frontend Engineer to join their innovative team in San Francisco, California. In this foundational role, you'll build user interfaces that leverage AI for sales teams, working closely with founders to define the product's frontend architecture. You should have over 5 years of experience in web application development, a strong command of React, TypeScript, and Next.js, and a passion for delivering high-quality features in a fast-paced startup environment.

Qualifications

• 5+ years building production web applications professionally.
• Expert in React, TypeScript, and Next.js stack.
• Experience building AI-powered or real-time user interfaces.
• Strong frontend architecture: state management, performance, and data.
• Comfortable with complex data structures and APIs.

Responsibilities

• Create interfaces that build user trust in AI.
• Architect frontend systems enabling team velocity and quality.
• Define API contracts and data patterns across teams.
• Establish performance standards for data-heavy AI interfaces.
• Mentor engineers, establish best practices, unblock teams.

Skills

React

TypeScript

Next.js

Frontend architecture

Data handling

Collaboration

Job description

About the role

You'll join Clarify as a founding Frontend Engineer, building the interfaces that bring AI to life for sales teams. You'll craft how users interact with LLM-powered features—conversational search, data enrichment, insights, and workflow automation. You'll work directly with founders to shape how AI surfaces in the product and set the foundation for our frontend architecture.

What you’ll do

• Create interfaces that build user trust in AI.

• Architect frontend systems enabling team velocity and quality.

• Define API contracts and data patterns across teams.

• Establish performance standards for data-heavy AI interfaces.

• Build component library and patterns teams adopt.

• Create frontend infrastructure: tooling, testing, deployment pipelines.

• Set architectural direction: state management, data fetching, routing.

• Mentor engineers, establish best practices, unblock teams.

Your background

• 5+ years building production web applications professionally.

• Expert in React, TypeScript, and Next.js stack.

• Experience building AI-powered or real-time user interfaces.

• Strong frontend architecture: state management, performance, and data.

• Comfortable with complex data structures and APIs.

• Pragmatic: balance speed with quality when shipping.

• Ship features: concept to production, testing, and monitoring.

• Strong collaboration with designers, engineers, product stakeholders.

• Startup experience: comfortable with ambiguity, changing priorities.

• Bonus: Data visualization, tables, or command palettes.