Senior Frontend Engineer

Halliday

1d•$150,000 - $250,000•Onsite

About The Position

We're looking for a senior-level frontend engineer with deep React and TypeScript experience to build consumer-facing crypto and payments products. As a Frontend Engineer at Halliday, you'll build the user-facing products that power the future of blockchain payments. You'll design and implement intuitive, high-performance interfaces that make onchain transactions seamless for millions of users. This is an opportunity to work on cutting-edge technology with a talented team that's redefining how people interact with blockchain.

Requirements

2+ years of experience building production frontend applications with React and TypeScript.
You write clean, maintainable code and care deeply about user experience.
Strong understanding of modern frontend development including state management, API integration, responsive design, and performance optimization.
You think beyond just implementing features, you understand the "why" behind what you're building and advocate for the best user experience.
You're excited to dive into new technologies, whether that's blockchain SDKs, payment APIs, or emerging web standards.
You work well with cross-functional teams, communicate effectively, and thrive in a fast-paced startup environment.
Based in or willing to relocate to the San Francisco Bay Area or New York City.

Nice To Haves

Previous work with blockchain technologies such as EVM-based chains, Solana, or Bitcoin.
Familiarity with Web3 libraries like ethers.js, viem, or wagmi.
Experience building payment flows, checkout experiences, or financial products.
Comfort working across the stack when needed, including APIs and backend services.
Strong eye for design and experience working closely with designers to implement pixel-perfect interfaces.
Active participation in open source projects or maintenance of public libraries.

Responsibilities

Build User-Facing Products: Design and develop responsive, performant frontend applications using React and TypeScript that interact with blockchain networks, payment systems, and DeFi protocols while delivering an exceptional user experience.
Develop Core Infrastructure: Build scalable components, design systems, and testing frameworks that support our payments platform and developer tools.
Ship Developer Tools: Contribute to Halliday's public SDKs and APIs, making it easy for developers to integrate blockchain payments into their applications.
Work Cross-Functionally: Collaborate with product, design, engineering, and partnerships teams to deliver features that solve real user problems and drive product adoption.
Drive Technical Excellence: Identify and implement improvements to enhance performance, accessibility, security, and code quality across our frontend stack.
Innovate on Web3 UX: Push the boundaries of what's possible in blockchain user experiences, making complex onchain actions feel simple and intuitive.