The Senior Frontend Engineer will develop AI-driven products, design user interfaces, build responsive applications, and optimize web performance in a startup environment.
Proxima
Proxima is more than just a business to us; it's a vision of transforming the consumer technology landscape and giving B2C businesses the data they need to make informed decisions that drive highly performant actions. We are empowering our customers to achieve their greatest potential with innovative, data-driven solutions.
We are a first-of-its-kind data intelligence solution that leverages artificial intelligence and a proprietary database of over 60 million (and growing) unique shopper personas to enable businesses to achieve greater scale, efficiency, and financial success across their acquisition, retention, and operational strategies. We’re on a mission to help maximize their performance with AI-powered solutions that have traditionally been out of reach for most companies. We believe profitable growth starts with better data.
About The Role
Proxima has a unique dataset most companies only dream of: real-time, anonymized cross-brand transaction data at scale.
We're looking for a Senior Frontend Engineer to join our team building AI-driven products powered by this data to help level the playing field, helping independent brands find their perfect customers while helping consumers discover their next favorite products from businesses they've never heard of.
You'll be responsible for crafting exceptional user experiences, from designing intuitive AI agent interfaces to building responsive web applications that make complex data insights accessible and delightful. This role is ideal for front-end specialists who obsess over pixel-perfect designs, smooth interactions, and performant web applications.
If you thrive in fast-paced, startup environments and love pushing the limits of modern frontend development with AI assistance, we want to talk to you.
Responsibilities
- Build, maintain, and scale frontend applications using TypeScript and React
- Design and implement user interfaces for AI agent interactions, data visualizations, and consumer-facing products
- Write clean, maintainable, and semantic HTML/CSS/SCSS with a strong eye for design and UX
- Create responsive, accessible, and performant web applications that work flawlessly across devices and browsers
- Collaborate closely with product and designers to translate mockups and prototypes into production-ready code
- Build reusable component libraries and design systems
- Optimize frontend performance, including bundle sizes, load times, and runtime efficiency
- Work with backend teams to integrate APIs and manage application state effectively
- Own frontend architecture decisions and champion best practices across the team
- Stay on the cutting edge of modern frontend development, especially around AI-powered user experiences
Qualifications
- 6+ years of professional frontend development experience
- Bachelor's degree (or higher) in Computer Science, Engineering, Design, or a related field
- Proven experience working in startup environments—you've shipped products fast and worn multiple hats
- Expert-level proficiency with TypeScript and React (including hooks, context, and modern patterns), with a strong ability to design maintainable, strongly-typed APIs
- Strong command of CSS/SCSS, including Flexbox, Grid, animations, and responsive design techniques
- Experience with modern frontend tooling (Webpack, Vite, ESBuild, etc.)
- Solid understanding of web performance optimization and browser APIs
- Experience building interfaces for AI-powered applications or complex data-driven products
- Daily use of AI-assisted coding tools (e.g., GitHub Copilot, Cursor, Claude Code, etc.) is a requirement
- Comfortable owning projects independently in a high-velocity development environment
Nice to Have
- Experience with state management libraries (Redux, Zustand, Jotai, etc.)
- Familiarity with design systems and component library development (Storybook, Radix, shadcn/ui, etc.)
- Knowledge of data visualization libraries (D3.js, Recharts, Plotly, etc.)
- Experience with frontend testing frameworks (Jest, Vitest, Playwright, Cypress)
- Understanding of accessibility standards (WCAG) and inclusive design principles
- Background in UX/UI design or strong design sensibility
Why Join Our Engineering Team
- Be part of a lean team building the next generation of AI-native tools and workflows
- High autonomy and ownership from day one
- Competitive compensation and equity
- NYC Hybrid (Tu-Thur office)
- A fast, iterative, and supportive development environment where your work has real impact
This role is open to remote candidates based in the US or hybrid candidates in the New York City area.
Work Authorization: We are not sponsoring visas at this time
Why You'll Love Working Here
Competitive salary
Unlimited PTO
Health benefits for you and your dependents
Annual memberships to OneMedical and Teladoc
Summer Fridays (July 4 – Labor Day)
Weekly in-office team lunch
12 weeks paid parental leave
401(k) program
Pre-tax commuter, HSA, and FSA benefits
Pet-friendly office in the heart of Soho
We value diversity and are proud to be an equal opportunity employer. We do not discriminate based on race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.
Top Skills
CSS
Esbuild
Github Copilot
React
Scss
Typescript
Vite
Webpack
Proxima New York, New York, USA Office
100 Crosby St., 506, New York, New York, United States, 10012
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