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Senior Mobile Engineer - Kotlin, iCasino - FBG

Leeds, England, United Kingdom

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 the Team

Launched in 2021, Fanatics Betting and Gaming is the online and retail sports betting subsidiary of Fanatics, a global digital sports platform. The Fanatics Sportsbook is available to 95% of the addressable online sports bettor market in the U.S. Fanatics Casino is currently available online in Michigan, New Jersey, Pennsylvania and West Virginia. Fanatics Betting and Gaming operates twenty-two retail sports betting locations, including the only sportsbook inside an NFL stadium at Northwest Stadium. Fanatics Betting and Gaming is headquartered in New York with offices in Denver, Leeds and Dublin.

Senior Mobile Engineer - Kotlin (Full-Stack) Overview

As a Senior Software Development Engineer, Mobile at Fanatics Betting & Gaming (FBG), you are a senior individual contributor with strong Kotlin expertise and a passion for building modern, scalable mobile experiences. While mobile development remains core to this role, we are specifically looking for engineers who can operate across the full stack,  contributing to both client applications and the backend systems that power them.

You bring deep experience with Kotlin (or Java), Jetpack Compose, and modern Android architecture, alongside hands-on experience building or contributing to backend services in distributed systems. You are comfortable working on Backends for Frontends (BFFs), API layers, and mobile-adjacent platform tooling that supports performant, real-time user experiences.

You thrive in a fast-paced, product-driven environment where your hands-on expertise, architectural thinking, and collaborative mindset make an impact. You write scalable, maintainable code across client and server layers, contribute to technical direction, and help level up those around you.

You’ll join the Fanatics Casino team, which owns the full iCasino experience across Fanatics platforms, including our standalone Casino App, iCasino within the Fanatics SportsBook & Casino App, and our Casino Desktop website. Our mission is to build the top online casino in the U.S., with an emphasis on fun, dynamic, and entertainment-first products that resonate with our most valuable customer segment: Spinners.

Our mobile stack is powered by Kotlin, Jetpack Compose, Compose Multiplatform, SwiftUI, and Kotlin Multiplatform Mobile (KMM). Our backend systems leverage Kotlin/Java-based services and distributed system patterns to support scale, performance, and real-time interactions.

Responsibilities

  • Develop, test, document, and deploy high-quality mobile software using Kotlin and Jetpack Compose.
  • Contribute to backend services supporting mobile clients, including BFF patterns and mobile-optimised APIs.
  • Design and implement scalable backend components using Kotlin or Java within distributed systems.
  • Build and evolve UI and business logic using Compose and shared Kotlin code, aligning with our cross-platform strategy.
  • Work on real-time communication patterns such as WebSockets, Server-Sent Events (SSE), or GraphQL where appropriate.
  • Collaborate with backend and platform teams to design API gateways and mobile-facing services.
  • Deliver features end-to-end, from functional requirements through implementation, testing, release, and iteration.
  • Contribute to technical design discussions spanning client and server boundaries.
  • Participate in our on-call rotation and help resolve production issues across both mobile and backend systems.
  • Improve testability, reliability, observability, and documentation while executing on refactoring and tech debt reduction.
  • Mentor junior engineers and contribute to shared libraries and platform standards.
  • Contribute to sprint planning, estimation, and retrospective processes.
  • Develop a strong understanding of the iCasino product and how backend design directly impacts mobile performance and experience.
     

Required Qualifications

  • Minimum 5+ years of professional software development experience.
  • Strong Kotlin (or Java) expertise with production experience.
  • Hands-on experience building Android apps using Jetpack Compose.
  • Experience contributing to backend services in distributed systems.
  • Experience working with REST APIs and designing mobile-optimised backend integrations.
  • Solid understanding of mobile architecture, app lifecycle, state management, and modern UI design principles.
  • Strong understanding of distributed systems fundamentals (scalability, resilience, state management).
  • Experience with real-time or event-driven systems (e.g., WebSockets, SSE, messaging systems, or GraphQL).
  • Demonstrated ability to deliver high-quality, maintainable code across client and server layers.
  • Strong debugging and problem-solving skills, especially in production environments.

Preferred Qualifications

  • Experience building or maintaining Backends for Frontends (BFFs).
  • Familiarity with API gateways and edge-layer concerns.
  • Experience working with Content Management Systems (CMS) or tooling that supports dynamic mobile content.
  • Experience with Compose Multiplatform and/or Kotlin Multiplatform Mobile (KMM).
  • iOS development experience (Swift / SwiftUI).
  • Experience in CI/CD environments (GitHub Actions, Bitrise, etc.).
  • Understanding of observability practices (logging, crash reporting, performance monitoring).
  • Exposure to high-growth or startup environments.
  • Passion for mobile gaming, entertainment products, or real-time user experiences.

Not sure if you check every box?

If you're excited about this role, passionate about Kotlin across mobile and backend systems, and interested in building world-class entertainment experiences powered by modern distributed architectures — we encourage you to apply. We value strong engineers who can operate across layers and think holistically about user experience and system design.

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.

For information about our benefits, please visit https://benefitsatfanatics.com/

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

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