Software Engineer III

Fanaticsfbg; Greater London; Remote; GBP 70,000 - 100,000; Full time

Job summary

Fanatics Markets in the United Kingdom is seeking a Software Engineer to build and maintain features across a full-stack product, from a web frontend in React/TypeScript to backend services in Go. You will join an early-stage product team and contribute to product definition, technical foundations, and development practices, while exploring AI-assisted development.

You'll collaborate with product, design, and platform teams, implement end-to-end capabilities, participate in code reviews, and

Qualifications

• 4+ years building scalable web apps or backend services
• Experience with React/TypeScript and Go or another backend language
• Familiarity with CI/CD, testing, and code reviews

Responsibilities

• Design, develop, test, and deploy scalable, high-quality experiences across frontend and backend
• Contribute to the Markets platform evolution with product and design
• Implement end-to-end features from implementation to monitoring and iteration
• Utilise AI tools to accelerate development while maintaining security and performance
• Collaborate with platform/infra teams and participate in code reviews
• Promote best practices for AI usage and code quality
• Operate effectively in an early-stage product environment

Skills

React

TypeScript

Next.js

Go

Python

CI/CD

AI tools

Education

BSc in Computer Science

Tools

GitHub Copilot

Claude Code

Codex

Job description

About Us

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 MarketsFanatics 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.

Overview

This Software Engineer role is an IC responsible for building and maintaining features across our full stack: the web application customers use to interact with our product, and the backend systems that power it. Whichever side you're strongest on, you'll have real room to build your reach into the other as you join a product at an exciting early stage, 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.

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, Codex, GitHub Copilot, or similar to ship production code efficiently while maintaining high quality standards.

Responsibilities

• Design, develop, test, and deploy scalable, high-quality experiences — whether that's front-end work in React, Next.js, and modern TypeScript, or backend work in Go (modeling data for markets, orders, and transactions) — while making meaningful contributions on the other side of the stack too
• Contribute to the technical evolution of our Markets 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
• 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 an early-stage product environment, seeking opportunities to unblock others and take initiative

Qualifications

• 4+ years experience building highly scalable, production systems — whether that's user-facing web applications in modern JavaScript/TypeScript and React, or backend services in a language like Go, Java or Python. If you're frontend-strong, you don't need to arrive fluent in Go — just curious about what's happening beneath the UI
• Proficiency in React, component-driven development, and state management patterns, with familiarity with libraries like NextJS, TanStack Query, Tailwind, Zustand — or, on the backend, familiarity with data modeling and event-driven architecture (e.g. Postgres, Kafka/PubSub)
• Solid understanding of your primary language's features, idioms, and best practices (JavaScript/TypeScript or a backend language)
• Understanding of performance and reliability — responsive design, accessibility, and web standards on the front end; scalability, observability, and correctness on the backend
• 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, 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

You don't need to tick every box — strength in one area and a willingness to learn goes a long way.

Preferred Qualifications

• Previous experience in early-stage or high-growth startup environments
• 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 directionBSc in Computer Science or related field

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.

Please note that visa sponsorship is not available for this position. We are open to fully remote candidates based in the United Kingdom. Remote employees may also be eligible for a home office setup stipend.