Senior Frontend Engineer

💼 Full-time💰 $150,000–$150,000🗓 2026-09-30 → 2026-10-01

Core

Design and develop responsive, performant frontend applications using React and TypeScript that interact with blockchain networks, payment systems, and DeFi protocols.

Role type

Senior Frontend Engineer (Web3/Payments)

Builds

Consumer-facing crypto and payments products, scalable components, design systems, and public SDKs/APIs

Domain

Fintech, Blockchain, Web3

Required skills

React, TypeScript, state management, API integration, responsive design, performance optimization, accessibility, security, code quality

Preferred skills

Blockchain technologies (EVM, Solana, Bitcoin), Web3 libraries (ethers.js, viem, wagmi), payment flows, full-stack capabilities, open source contributions

Technologies

React, TypeScript, ethers.js, viem, wagmi

Responsibilities

Design and develop frontend applications interacting with blockchain networks and payment systems; Build scalable components, design systems, and testing frameworks; Contribute to public SDKs and APIs; Collaborate cross-functionally to deliver features; Identify and implement improvements to performance, accessibility, and code quality; Innovate on Web3 UX

Seniority

Senior, hands-on IC

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About Halliday

Series A50 Employees

Halliday is a blockchain company and product lab working to create a unified, cross-chain payments ecosystem. Its flagship product, Halliday Payments, is a unified payments platform that makes it easy for users to onramp, swap, and take other onchain actions. Halliday’s products are built on the Workflow Protocol, which removes the need to code smart contracts by hand and enables breakthrough applications to ship in hours, not years.