Senior Frontend Engineer

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.

What you’ll be doing

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.

User Interface/Experience (UI/UX), Embedded Systems, Ecosystems, Customer Conversion, User Interface/Experience (UI/UX), Customer Relations, Cryptography, Customer Experience, Blockchain, Leading Edge Technology, Frontend Expertise: 5+ years of experience building production frontend applications with React and TypeScript. You write clean, maintainable code and care deeply about user experience.

Technical Proficiency: Strong understanding of modern frontend development including state management, API integration, responsive design, and performance optimization.

Product Mindset: You think beyond just implementing features, you understand the “why” behind what you’re building and advocate for the best user experience.

Fast Learner: You’re excited to dive into new technologies, whether that’s blockchain SDKs, payment APIs, or emerging web standards.

Collaborative Spirit: You work well with cross-functional teams, communicate effectively, and thrive in a fast-paced startup environment.

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

Nice to haves

Blockchain Experience: Previous work with blockchain technologies such as EVM-based chains, Solana, or Bitcoin. Familiarity with Web3 libraries like ethers.js, viem, or wagmi.

Payments Background: Experience building payment flows, checkout experiences, or financial products.

Full-Stack Capabilities: Comfort working across the stack when needed, including APIs and backend services.

Design Sensibility: Strong eye for design and experience working closely with designers to implement pixel-perfect interfaces.

Open Source Contributions: Active participation in open source projects or maintenance of public libraries.

Competitive compensation package, with unlimited PTO and a friendly work environment., 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. Your recruiter can share more about the compensation and benefits applicable to your location during the hiring process.