Senior Blockchain Engineer - Fullstack
Role details
Job location
Tech stack
Job description
This Software Engineer III (Full Stack) role is a senior-level IC with significant ownership over the web application that customers use to interact with our product. You'll join a true 01 team, helping define the product, technical foundations, and ways of working from scratch. You'll lead by example, establishing best practices for AI-assisted development while building systems that can handle millions of events daily., * Lead the design, development, testing, and deployment of scalable, high-quality web experiences using React, Next.js, and modern JavaScript/TypeScript
- Drive the technical evolution of our Markets web platform, partnering closely with product and design to deliver engaging, performant, and accessible features
- Own features end-to-end: spec writing implementation instrumentation deployment monitoring iteration based on metrics
- Design and implement experimentation capabilities (feature flags, A/B tests) to validate ideas quickly and safely
- Integrate with backend APIs and collaborate with platform teams to build reliable, observable systems
- Make contributions to the Go backend
- Conduct thorough code reviews, raising the bar on code quality, readability, and maintainability
- Leverage AI tools to accelerate development velocity while maintaining high standards for security, correctness, and performance
- Establish and document team standards for AI usage (prompt patterns, code review checklists, validation strategies)
- Contribute to a fast-paced 01 environment, unblocking others and taking initiative where processes are still being defined
Requirements
- Over 4 years experience building highly scalable, user-facing web applications using modern JavaScript/TypeScript and React
- Experience in React architecture, component-driven development, and modern state management patterns, libraries like NextJS, TanStack Query, Tailwind, Zustand
- Experience in developing blockchain dApps in EVM or Solana (including hackathons or side projects)
- Familiarity with common web3 libraries such as ethers.js, viem, or similar client libraries for interacting with smart contracts
- Deep knowledge of JavaScript/TypeScript language features, idioms, and best practices, with the ability to influence team standards
- Strong understanding of performance optimization, responsive design, accessibility, and web standards
- Experience integrating with backend APIs and collaborating with cross-functional platform/infra teams
- Experience with CI/CD pipelines, testing strategies, and safe deployment practices for web applications
- Team-first mentality, with a willingness to do what it takes to get the job done and a desire to strive for better
- Demonstrated experience using AI tools (Claude Code, Codex, Cursor, Copilot, etc.) to ship production code
- Can demonstrate specific examples of workflow improvements (e.g., "reduced boilerplate generation time by 40%")
- Effectively communicates complex technical concepts clearly to diverse audiences, including engineers and stakeholders
- Thrives in a high-growth environment where priorities evolve regularly and decisions are made quickly
- Strong ability to collaborate cross-functionally across diverse teams within large enterprise environments, supporting alignment and shared success, * Previous experience in 01 or high-growth startup environments
- Contributions to open-source projects or technical community
- Experience with real-money transaction systems and regulatory compliance
- Background in building developer tools or improving engineering productivity
- Experience leading without authority and influencing technical direction across teams
Benefits & conditions
Depending on the role, your interview and onboarding experience may include in-person components, such as onsite interviews or Launching into Better: LIVE-a multi-day cultural immersion in New York City for full-time, non-seasonal hires. These sessions are designed to build connection and bring our culture to life, though specific travel and participation requirements will be confirmed based on your role and location. Your recruiter will provide clear guidance at each stage of the process. Ready to build the future of sports betting? If you possess some of these skills but not all of them, we still encourage you to apply! Please note that visa sponsorship is not available for this position. We are open to fully remote candidates based in the United Kingdom. Remote employee may also be eligible for a home office setup stipend.
