Staff Software Engineer - FMX

Fanatics Betting & Gaming; Greater London; Remote; GBP 110,000 - 160,000; Full time

Job summary

Fanatics Betting & Gaming is seeking a Staff Software Engineer to own major areas of the Markets platform. You will guide architecture, mentor engineers, and ship across frontend and backend stacks, applying React, Next.js, TypeScript, and Go.

You will also shape AI-assisted development practices and drive scalable, reliable systems at scale. You will collaborate with product, design, and infra teams to balance performance, security, and delivery speed while maintaining high engineering

Qualifications

• Experience shaping React architecture and component-driven development.
• Strong backend or frontend leadership across teams.
• Proven ability to deliver complex, scalable systems.

Responsibilities

• Set technical direction for major areas of the Markets platform across teams.
• Lead design and delivery of scalable systems, contributing hands-on in React/Next.js/TypeScript or Go services.
• Guide architecture, enable teams, and balance customer needs with reliability and speed.
• Own end-to-end initiatives from discovery to deployment and monitoring.
• Mentor engineers and establish AI-assisted development practices.
• Drive CI/CD improvements and safe deployment strategies.

Skills

React

Next.js

TypeScript

Go

Postgres

Kafka/PubSub

Tailwind

Zustand

AI tools (Claude Code/Codex/Copilot)

Education

BSc in Computer Science or related field

Tools

GitHub Copilot

Job description

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.

Overview

This Staff Software Engineer role is an individual contributor position with technical leadership and significant ownership across our full stack: the web application customers use to interact with our product and the backend systems that power it. You'll combine hands‑on engineering with responsibility for shaping architecture, setting technical direction, and enabling engineers across teams to deliver effectively.

Whether your deepest expertise is in frontend or backend engineering, you'll apply that strength across the platform while making meaningful contributions on the other side of the stack. Joining a product at an exciting early stage, you'll help define its technical foundations, identify the highest‑impact engineering challenges, and turn ambiguous problems into clear plans that balance customer needs, delivery speed, and long‑term reliability.

Your impact will extend beyond the systems you build. You'll lead complex initiatives spanning teams, mentor engineers, and establish practices that improve engineering quality and effectiveness. You'll also shape our approach to 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 have gone beyond experimentation — who actively use Claude Code, Codex, GitHub Copilot, or similar tools to ship production code faster while maintaining exceptional quality standards, and who can help others adopt these workflows responsibly and effectively.

Responsibilities

• Set technical direction for major areas of the Markets platform, aligning architectural decisions with product strategy and guiding their implementation across teams
• Lead the design and delivery of complex, scalable systems and customer experiences, contributing hands‑on in React, Next.js, and TypeScript or backend services in Go, while making meaningful contributions across the stack
• Identify and resolve ambiguous engineering problems spanning team or system boundaries, turning them into clear proposals, delivery plans, and measurable outcomes
• Own critical initiatives end‑to‑end, from discovery and technical specifications through implementation, instrumentation, deployment, monitoring, and iteration
• Partner with product, design, platform, and infrastructure teams to make informed tradeoffs across customer experience, accessibility, performance, security, reliability, and delivery speed
• Define architecture and integration patterns for frontend applications, backend APIs, and event‑driven systems, with particular attention to correctness in markets, orders, and transactions
• Guide the design of experimentation capabilities, including feature flags and A/B tests, so teams can validate ideas quickly and safely
• Anticipate scaling constraints, reliability risks, and technical debt; build alignment on pragmatic improvements and drive them through to completion
• Raise engineering standards through design reviews, code reviews, testing strategies, observability, and safe deployment practices
• Mentor engineers and develop technical leaders, helping teams make sound decisions and solve problems independently
• Establish and evolve standards for AI‑assisted development, including appropriate use cases, review expectations, security safeguards, and validation strategies
• Measure and improve engineering effectiveness, sharing tools and practices that increase delivery speed without compromising quality
• Lead through influence in an early‑stage product environment, creating clarity, unblocking teams, and establishing ways of working that support growth

Qualifications

• Substantial experience building and operating highly scalable production systems, with demonstrated impact at Staff level or equivalent scope, including technical leadership across teams or major platform areas
• A track record of setting technical direction and delivering complex initiatives from ambiguous requirements through to measurable production outcomes
• Strong architectural judgment, including the ability to assess tradeoffs, establish clear system boundaries, and evolve systems as product requirements and scale change
• Experience shaping React architecture, component‑driven development, and modern state management using tools such as Next.js, TanStack Query, Tailwind, or Zustand; or deep backend experience with data modeling, distributed systems, and event‑driven architecture using technologies such as Postgres and Kafka/PubSub
• Deep knowledge of your primary language's features, idioms, and best practices, with experience establishing standards adopted beyond your immediate team
• Strong understanding of performance, reliability, and security, including responsive design and accessibility on the frontend or scalability, observability, data integrity, and failure handling on the backend
• Experience defining API contracts and collaborating across product, platform, and infrastructure teams to deliver reliable systems
• Experience shaping CI/CD pipelines, testing strategies, and safe deployment practices across services or applicationsDemonstrated ability to lead through influence, build alignment across teams, and communicate technical decisions clearly to engineers and non‑technical stakeholders
• A track record of mentoring engineers, strengthening technical decision‑making, and increasing the effectiveness of others
• Demonstrated experience using AI tools such as Claude Code, Codex, Cursor, or Copilot to ship production code, with sound judgment about their limitations and appropriate validation
• Specific examples of improving development workflows, with evidence of their impact on delivery speed, quality, or engineering productivity
• A team‑first approach, with the judgment to move between strategic technical work and hands‑on delivery according to the needs of the product
• Ability to create clarity in a high‑growth environment where priorities evolve and decisions must be made quickly
• Strong cross‑functional collaboration skills, including experience aligning teams and navigating dependencies within large enterprise environments

You don't need to tick every box — deep strength in one area, demonstrated technical leadership, and a willingness to learn go a long way.

Preferred Qualifications

• Previous experience shaping technical foundations in early‑stage or high‑growth startup environments
• Experience with real‑money transaction systems, including financial correctness, auditability, and regulatory requirements
• Experience developing technical roadmaps or leading architectural changes adopted across multiple teams
• Background in building developer tools or improving engineering productivity at scale
• Experience establishing AI‑assisted engineering practices across teams
• Contributions to open‑source projects or the technical community
• BSc in Computer Science or a 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 connections 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.

We are open to fully remote candidates based in the United Kingdom. Remote employees may also be eligible for a home office setup stipend.

By submitting your application, you agree to our terms of service and acknowledge you have read our Candidate Privacy Policy.

Fanatics will never ask candidates for money, banking information, or other sensitive personal information as part of the interview process. If you receive a suspicious message claiming to be from Fanatics recruiting, please do not respond and report it here .

Voluntary Self‑Identification

For government reporting purposes, we ask candidates to respond to the below self‑identification survey.Completion of the form is entirely voluntary. Whatever your decision, it will not be considered in the hiringprocess or thereafter. Any information that you do provide will be recorded and maintained in aconfidential file.

As set forth in Fanatics Betting & Gaming’s Equal Employment Opportunity policy,we do not discriminate on the basis of any protected group status under any applicable law.

If you believe you belong to any of the categories of protected veterans listed below, please indicate by making the appropriate selection.As a government contractor subject to the Vietnam Era Veterans Readjustment Assistance Act (VEVRAA), we request this information in order to measurethe effectiveness of the outreach and positive recruitment efforts we undertake pursuant to VEVRAA. Classification of protected categoriesis as follows:

A "disabled veteran" is one of the following: a veteran of the U.S. military, ground, naval or air service who is entitled to compensation (or who but for the receipt of military retired pay would be entitled to compensation) under laws administered by the Secretary of Veterans Affairs; or a person who was discharged or released from active duty because of a service‑connected disability.

A "recently separated veteran" means any veteran during the three‑year period beginning on the date of such veteran's discharge or release from active duty in the U.S. military, ground, naval, or air service.

An "active duty wartime or campaign badge veteran" means a veteran who served on active duty in the U.S. military, ground, naval or air service during a war, or in a campaign or expedition for which a campaign badge has been authorized under the laws administered by the Department of Defense.

An "Armed forces service medal veteran" means a veteran who, while serving on active duty in the U.S. military, ground, naval or air service, participated in a United States military operation for which an Armed Forces service medal was awarded pursuant to Executive Order 12985.