Senior Frontend Engineer
Senior frontend engineer building consumer-facing crypto and payments products with React and TypeScript. Requires 2+ years React/TS experience and willingness to work onsite in SF or NYC.
About the job
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: 2+ 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.
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.
Skills
React, TypeScript, State Management, API Integrations, Responsive Design, Performance Optimization, Ethers.Js, Viem, Wagmi, Blockchain
Similar jobs
Frontend Engineering jobs
Ether.Fi
Denver, COSenior Frontend Engineer building and maintaining user-facing DeFi products, complex frontend components, and client-side transaction flows. Requires strong software fundamentals, product judgment, attention to detail, and at least three years of professional coding experience.
Sleeper
San Francisco, CA
Build and own scalable, consumer-facing fantasy sports web experiences using React and TypeScript. The role emphasizes responsive interaction design, animation, performance, reusable components, and API integration, requiring 5+ years of web development experience.
Atomicmachines
Emeryville, CABuild and maintain complex React and TypeScript interfaces for manufacturing, engineering, and AI/ML workflows. The role requires experience with stateful interaction-heavy applications, data validation, debugging, and cross-functional collaboration in technically complex environments.
Datadog
New York, NY
Senior frontend software engineer designing and delivering responsive, scalable interfaces for a data-intensive observability product. The role requires strong JavaScript ecosystem expertise, reusable UI design patterns, performance optimization skills, and practical experience with AI coding tools.
LangChain
San Francisco, CABuild and evolve LangChain’s reusable React component library and the tooling that supports accessible, consistent, high-quality interfaces across its products. The role requires strong React and TypeScript expertise, design-systems experience, and close collaboration with designers.