Sr. Fullstack Engineer

About D3: D3 is building the world’s first purpose-built blockchain for DomainFi —bringing domain tokenization and DeFi primitives to a massive, rapidly growing $350B+ real-world asset class . We’re revolutionizing how existing and future domain names are owned, traded, and leveraged in the digital economy. Our elite team is stacked with industry veterans who have spent the last three decades shaping the internet , from pioneering domain name monetization to architecting key internet protocols to launching and running major TLDs like .xyz, .inc, .tv, and .link . With a proven track record of innovation and success, we’re now redefining what’s possible in the domain space. We recently closed a $25M Series A led by Paradigm - one of the best investors in the industry. This will help fuel our mission to bring domains fully on-chain and unlock new financial possibilities for one of the internet’s most valuable asset classes. We’re based in Los Angeles, with team members all over the world. We’re looking for driven, talented builders to help build a trillion-dollar DomainFi economy. Join us! Job Description We are seeking a highly skilled and experienced Senior Fullstack Engineer to join our team. In this role, you will design, develop, and optimize both frontend and backend components that power our user-facing applications, including decentralized applications (dApps), a Web2/Web3-compatible Registrar, and domain marketplaces. You will play a critical part in building scalable, secure, and user-friendly systems that bridge traditional DNS with blockchain-based naming technologies. Familiarity with token standards (ERC-721, ERC-1155, ERC-20), wallet integrations, event-driven architectures, and distributed systems is essential. Responsibilities Frontend Collaborate with the product team to translate requirements into technical specifications and user-facing features. Develop and maintain frontend components of the domain registrar and marketplace using Next.js, Typescript, React, GraphQL, HTML, and CSS . Design and implement dApps that seamlessly integrate Web2 and Web3 APIs. Build pixel-perfect UI from wireframes and high-fidelity mocks with attention to detail. Contribute to open-source SDKs enabling developers to integrate Doma Protocol into their apps. Write and maintain unit, integration, and E2E tests. Ensure accessibility (WCAG), SEO, web performance best practices, scalability, and security. Backend Design, implement, and maintain backend services to support registrar features, domain tokenization, and Web2/Web3 marketplaces. Build robust systems for payment processing , integrating fiat and crypto gateways. Develop backend systems supporting event-driven architectures and asynchronous processing with Kafka, RabbitMQ, or similar tools. Write scalable APIs, ensuring code quality through reviews, testing, and debugging. Maintain and optimize existing services for performance and reliability. Stay up to date with best practices and emerging technologies in web and blockchain development. Qualifications Bachelor’s degree in Computer Science, Software Engineering, or related field (advanced coursework and certifications are a plus). 5+ years frontend development (React, Vue, or Angular). 5+ years backend development (Node.js with MySQL/Postgres). Experience building highly scalable, distributed production systems. CSS frameworks (Tailwind, Bootstrap) and responsive design. Mobile-first design principles and optimization for small screens. Web3 libraries (web3.js, ethers.js, wagmi). Event-driven architecture and asynchronous processing. Experience with APIs, microservices, and distributed systems. Basic understanding of blockchain architecture and smart contract interaction. Strong problem-solving, adaptability, and self-motivation. Familiarity with Git, Agile methodologies, and CI/CD practices. Excellent communication and teamwork skills. Pluses Smart contract development (Solidity). Experience with React Native or mobile devel