Senior Frontend Engineer
Halliday is an end-to-end deposit platform that unifies crypto, card, bank, exchange, and fintech funding flows in an embedded user experience.
Funding history
About Halliday
Halliday provides a unified deposit experience for crypto applications, supporting crypto wallets and networks alongside cards, Apple Pay, Google Pay, bank rails, centralized exchanges, and fintech payment methods. Its developer offering includes a drop-in widget or headless API, sandbox testing, webhooks, versioned API changes, and example apps.
Skills
Candidate Availability
Required and preferred rules are kept separate and reflect the wording in the original posting.
About the Role
Design and build responsive, high-performance frontend applications with React and TypeScript for blockchain payments and DeFi products. Develop scalable components, design systems, testing frameworks, SDKs, and APIs; collaborate cross-functionally; improve performance, accessibility, security, and code quality; and simplify complex onchain user experiences.
Requirements
- 2+ years of experience building production frontend applications with React and TypeScript
- Understanding of state management, API integration, responsive design, and performance optimization
- Ability to collaborate with cross-functional teams
- Based in or willing to relocate to the San Francisco Bay Area or New York City
- Blockchain experience with EVM-based chains, Solana, or Bitcoin is a plus
- Familiarity with ethers.js, viem, or wagmi is a plus
- Payments experience is a plus
- Full-stack experience with APIs and backend services is a plus
- Design implementation experience is a plus
- Open source participation is a plus
Responsibilities
- Design and develop responsive frontend applications using React and TypeScript
- Build scalable components, design systems, and testing frameworks
- Contribute to public SDKs and APIs
- Collaborate with product, design, engineering, and partnerships teams
- Improve frontend performance, accessibility, security, and code quality
- Simplify complex onchain user experiences
Benefits
- Unlimited PTO
- Visa sponsorship for international candidates