Senior Frontend Engineer

About the role

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.

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.

Requirements

• Frontend Expertise: 2+ years of experience building production frontend applications with React and TypeScript.
• Strong understanding of modern frontend development including state management, API integration, responsive design, and performance optimization.
• 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.

Qualifications

• Location: Based in or willing to relocate to the San Francisco Bay Area or New York City.
• Nice to haves: Payments Background, Full-Stack Capabilities, Design Sensibility, Open Source Contributions.

Benefits

Competitive compensation package, with unlimited PTO and a friendly work environment. For international candidates - we offer visa sponsorship!

Pay

The base salary range for this role is $150,000 - $250,000. This reflects the minimum and maximum range across all US locations. This does not include equity or benefits. The actual base pay is dependent upon many factors, such as: experience, relevant skills, and role level.

Schedule

Based in or willing to relocate to the San Francisco Bay Area or New York City.