Frontend Engineer

Evlo AI; San Francisco (CA); On-site; USD 150,000 - 190,000; Full time

Job summary

Evlo AI in San Francisco seeks a frontend engineer to own user-facing web interfaces used by millions daily. You will ship React and TypeScript code to production, focusing on performance, accessibility, and UX polish as core engineering responsibilities.

You will collaborate with product designers, backend engineers, and PMs to turn ambiguous product requirements into fast, reliable interfaces and own frontend architecture decisions that scale.

Qualifications

• 3–6 years of professional frontend engineering experience in large-scale web apps.
• Deep expertise in React and TypeScript.
• Experience with modern CSS tooling and responsive design.
• Experience with state management and data-fetching libraries.
• Proven ability to improve performance metrics (LCP, FID, bundle size).
• Able to work in a fast-moving environment with frequent releases.

Responsibilities

• Build and maintain production React applications end-to-end.
• Design reusable components and design system integrations.
• Optimize performance, Core Web Vitals, and bundle sizes.
• Integrate with REST and GraphQL APIs with robust state management.
• Write unit and integration tests; maintain high coverage.
• Participate in code reviews and frontend tooling decisions.
• Collaborate with designers to ensure accessibility in every release.

Skills

React

TypeScript

Frontend architecture

Performance optimization

Accessibility

Testing (Jest/RTL)

State management (Redux/Zustand/React 

Tools

Tailwind CSS

CSS-in-JS

Sass

Redux

Zustand

React Query

Apollo Client

Vite

Webpack

Storybook

GraphQL

Job description

About The Role

The role owns the design, implementation, and performance of user-facing web interfaces used by millions of daily visitors. The team ships React and TypeScript code to production continuously and treats frontend performance, accessibility, and UX polish as core engineering responsibilities, not afterthoughts.

About The Role

The role owns the design, implementation, and performance of user-facing web interfaces used by millions of daily visitors. The team ships React and TypeScript code to production continuously and treats frontend performance, accessibility, and UX polish as core engineering responsibilities, not afterthoughts.

You will work directly with product designers, backend engineers, and PMs to turn ambiguous product requirements into fast, reliable interfaces - and own the frontend architecture decisions that make them scale.

Key Responsibilities

• Build and maintain production React applications in TypeScript, shipping features end-to-end from design handoff to deployment
• Design reusable component libraries and design system integrations that keep UI consistent across multiple product surfaces
• Optimize application performance: bundle sizes, Core Web Vitals, code splitting, and rendering behavior at scale
• Integrate with REST and GraphQL APIs, handling caching, error states, and optimistic updates with robust state management (Redux, Zustand, or React Query)
• Write comprehensive unit and integration tests using Jest, React Testing Library, or Playwright; maintain high coverage on critical user flows
• Participate in code reviews, architecture discussions, and frontend tooling decisions - from build pipelines (Vite, Webpack, Turborepo) to CI/CD
• Collaborate with designers to identify UX issues early and advocate for accessibility standards (WCAG 2.1 AA) in every release

What We Are Looking For

• 3–6 years of professional frontend engineering experience building and maintaining large-scale web applications
• Deep expertise in React and TypeScript, with a strong grasp of rendering behavior, hooks, and component composition patterns
• Experience with modern CSS tooling (Tailwind, CSS-in-JS, Sass) and responsive, cross‑browser layout
• Hands‑on experience with state management and data‑fetching libraries: Redux, Zustand, React Query, or Apollo Client
• Track record of improving measurable performance metrics (LCP, FCP, bundle size) in a production application
• Comfort working in a fast‑moving environment with frequent releases, feature flags, and experimentation
• Bonus: GraphQL experience, design system ownership, Storybook, Node.js/BFF layer work, or contributions to open‑source frontend tooling