This description is a summary of our understanding of the job description. Click on 'Apply' button to find out more. Role 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 development. - Familiarity with EPP (Extensible Provisioning Protocol) in domain systems. - Experience with NestJS, GraphQL. - DevOps experience (Kubernetes, AWS, GCP, DigitalOcean, Linux). - Accessibility design knowledge. Benefits - Ground-Floor Growth, Learning, and Impact: D3 is your chance to dive headfirst into an ultra-early-stage company where every move you make truly matters. You’ll have the opportunity to sharpen your skills, expand your expertise, and shape the foundation of something groundbreaking. - Strong, Proven Leadership: At D3, you’ll work alongside industry visionaries who have been there, done that, and are ready to do it again—only bigger. You’ll gain invaluable mentorship, develop a high-impact mindset, and be challenged to grow in ways you never imagined. - Unique Market Positioning: We’re pioneering at the intersection of internet infrastructure, real-world assets, and blockchain communities, creating solutions that redefine what’s possible in Web3.

• Design, build and ship well-tested features across our platform, with support from more senior engineers. • Take ownership of user stories from refinement through to production and post-release support. • Collaborate closely with Product and Design to understand problems and translate requirements into pragmatic technical solutions. • Write clean, maintainable code and contribute to improving code quality through reviews and refactoring. • Participate in incident investigation and support, helping to improve system reliability and observability over time. • Continuously develop your technical skills and broaden your understanding of the wider system. • Contribute positively to our engineering culture by sharing knowledge, asking questions, and supporting your teammates.

• Provide technical leadership within your team and domain, guiding design decisions and architectural direction. • Design, build and deliver complex features and systems that are secure, scalable and maintainable. • Own technical outcomes end-to-end, from discovery and design through to delivery and long-term operation. • Mentor and coach engineers across the team, supporting their technical growth and confidence. • Set a high bar for code quality, testing, observability and operational excellence. • Collaborate closely with Product and Design to shape solutions, challenge assumptions and manage trade-offs. • Lead technical discussions, reviews and incident investigations, helping the team learn and improve. • Contribute to wider engineering initiatives and influence standards across the technology organization.

• Design and develop flight-critical software using Simulink, Stateflow, and related MathWorks tools for model-based design. • Define software architecture, modeling standards, and development workflows aligned with DO-178C and DO-331. • Create, maintain and review software requirements, models and auto-generated code. • Ensure robustness and traceability through requirements-based design, verification, and certification artifact production. • Collaborate with engineers from cross functional groups such as systems, safety, hardware, flight controls and test to ensure product and program level needs are met. • Support integration into CI pipelines, including model checks, code generation, static analysis, and automated verification. • Contribute to planning and execution of SOI audits and certification reviews. • Create and maintain comprehensive documentation for software requirements, architecture and design decisions • Support hardware-in-the-loop (HIL), processor-in-the-loop (PIL), and flight testing activities.