Software Engineer - Fullstack

This Software Engineer (Full Stack) role is an IC responsible for building and maintaining features for the web application that customers use to interact with our product. You'll join a true 01 team, contributing to the product definition, technical foundations, and ways of working from scratch. You'll contribute high-quality code and support best practices for AI-assisted development while building systems that can handle millions of events daily., * Design, develop, test, and deploy scalable, high-quality web experiences using React, Next.js, and modern JavaScript/TypeScript.

• Contribute to the technical evolution of our Markets web platform, partnering with product and design to deliver engaging, performant, and accessible features.
• Implement and support features end-to-end: implementation instrumentation deployment monitoring iteration based on metrics.
• Implement and maintain 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.
• Participate in code reviews, focusing on code quality, readability, and maintainability
• Leverage AI tools to accelerate development velocity while maintaining high standards for security, correctness, and performance.
• Follow and help improve team standards for AI usage (prompt patterns, code review checklists, validation strategies).
• Contribute effectively to a fast-paced 01 environment, seeking opportunities to unblock others and take initiative.

On the engineering side, we're pioneering the use of AI as a code collaborator. We need engineers who are proficient in using tools like Claude Code, Cursor, Codex, GitHub Copilot, or similar to ship production code efficiently while maintaining high quality standards., * 3+ years experience building user-facing web applications using modern JavaScript/TypeScript and React.

• Proficiency in React, component-driven development, and state management patterns, with familiarity with libraries like NextJS, TanStack Query, Tailwind, Zustand.
• We're looking for someone with a genuine interest in the blockchain space. Ideally, you've tinkered with EVM or Solana dApps and have experimented with libraries like ethers.js or viem to fetch data or trigger transactions.
• Solid understanding of JavaScript/TypeScript language features, idioms, and best practices.
• Understanding of performance optimization, responsive design, accessibility, and web standards.
• Experience integrating with backend APIs and collaborating with cross-functional platform/infra teams.
• Familiarity 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.
• Experience using AI tools (Claude Code, Codex, Cursor, Copilot, etc.) to ship production code.
• Able to discuss how AI tools improve development workflow (e.g., boilerplate generation, debugging).
• Communicates technical concepts clearly to diverse audiences, including engineers and stakeholders.
• Thrives in a fast-paced environment where priorities evolve regularly and decisions are made quickly.
• Ability to collaborate cross-functionally across diverse teams., * Previous experience in a startup environment.
• Contributions to open-source projects or technical communities.
• Experience with real-money transaction systems and regulatory compliance.
• Background in improving engineering productivity.
• Interest in learning and influencing technical direction.

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.

Fanatics is building a leading global digital sports platform. We ignite the passions of global sports fans and maximize the presence and reach for our hundreds of sports partners globally by offering products and services across Fanatics Commerce, Fanatics Collectibles, and Fanatics Betting & Gaming, allowing sports fans to Buy, Collect, and Bet. Through the Fanatics platform, sports fans can buy licensed fan gear, jerseys, lifestyle and streetwear products, headwear, and hardgoods; collect physical and digital trading cards, sports memorabilia, and other digital assets; and bet as the company builds its Sportsbook and iGaming platform. Fanatics has an established database of over 100 million global sports fans; a global partner network with approximately 900 sports properties, including major national and international professional sports leagues, players associations, teams, colleges, college conferences and retail partners, 2,500 athletes and celebrities, and 200 exclusive athletes; and over 2,000 retail locations, including its Lids retail stores. Our more than 22,000 employees are committed to relentlessly enhancing the fan experience and delighting sports fans globally. About Fanatics Markets: Fanatics Markets is the real-money prediction and trading app where you can invest in moments you care about. Built on a secure platform, we let users predict real-world outcomes and trade on events they actually follow - from sports and entertainment to political elections and beyond. Our mission is to redefine how fans engage with the moments and markets that matter most. We're looking for the right people to help us build the future of prediction markets.