Senior Frontend Developer

Halliday; San Francisco (CA); On-site; USD 150,000 - 250,000; Full time

Benefits offered by this job

Unlimited PTO

Visa sponsorship

Job summary

Halliday is building the next generation of blockchain-powered deposit experiences. We craft consumer-facing frontend products using React and TypeScript that connect to blockchain networks and payment systems, delivering fast, intuitive user interfaces.

You will contribute to scalable UI components, SDKs, and developer tools while collaborating with product, design, and partnerships teams to drive adoption and performance in a fast-paced startup environment.

Qualifications

• 5+ years of production frontend experience with React and TypeScript.
• Strong understanding of state management, API integration, responsive design, and performance optimization.
• Collaborative, product-minded, fast learner in a startup environment.

Responsibilities

• Build user-facing products with React and TypeScript that interact with blockchain networks and payments systems.
• Develop scalable frontend components, design systems, and testing frameworks for our platform.
• Ship developer tools and public SDKs/APIs to make blockchain payments easy for developers.
• Work cross-functionally with product, design, engineering, and partnerships teams to deliver features that solve real user problems.
• Drive frontend performance, accessibility, security, and code quality improvements across the stack.
• Innovate on Web3 UX to simplify complex on-chain actions for millions of users.

Skills

React

TypeScript

Frontend development

User experience

Tools

viem

wagmi

Job description

Halliday is the end-to-end deposit platform, unifying every way a user funds their account into one seamless, fully embedded experience. Halliday Payments powers deposits for ecosystems like Story, XO Market, Stable, and MegaETH, helping them convert more users with less friction.

Backed by a16z, #Hashed, SV Angel, and a_capital, Halliday's team includes alumni from Stanford, Harvard, Compound, Spotify, Dapper Labs, Netflix, Amazon, Stripe, and more.

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.

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.

What we’re looking for

• 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.

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

Why Work at Halliday?

A role with significant autonomy to build out the next generation infrastructure of the blockchain space.

Competitive compensation package, with unlimited PTO and a friendly work environment.

For international candidates - we offer visa sponsorship!

Compensation

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.