Software Engineer III Kotlin Mobile

Fanatics Inc; Remote; GBP 60,000 - GBP 80,000; Full time

Job summary

A leading gaming company is seeking a Software Development Engineer III – Mobile in Leeds to develop and scale mobile software using Kotlin and Jetpack Compose. Ideal candidates will have a proven track record in mobile application development and thrive in a fast-paced, collaborative environment. Responsibilities include building high-quality mobile software, engaging in architectural discussions, and mentoring junior engineers. This role offers the opportunity to work on exciting projects within the iCasino sector, emphasizing quality and innovation.

Qualifications

• 5+ years of professional mobile development experience, strong Kotlin expertise.
• Experience building production mobile apps using Jetpack Compose.
• Strong problem-solving and debugging skills, especially in production environments.

Responsibilities

• Develop, test, document, and deploy high-quality mobile software primarily using Kotlin and Jetpack Compose.
• Collaborate closely with product managers, designers, and engineers across platforms.
• Participate in technical design and architecture discussions.

Skills

Kotlin expertise

Jetpack Compose

Problem-solving skills

Agile environment experience

Communication skills

Tools

CI/CD tools

Job description

As a Software Development Engineer III – Mobile at Fanatics Betting & Gaming (FBG), you are a senior individual contributor with a strong foundation in Kotlin-based mobile development and a passion for building modern, scalable mobile experiences. You bring deep experience with Kotlin and Jetpack Compose, a growing or existing interest in Compose Multiplatform and Kotlin Multiplatform Mobile (KMM), and optional but valuable experience in iOS (Swift / SwiftUI). 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, 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 built for speed and scale, powered by modern technologies like Kotlin, Jetpack Compose, Compose Multiplatform, SwiftUI, and KMM to deliver high-quality features quickly and consistently across platforms. We embrace best‑in‑class engineering practices, operational excellence, and cross‑functional collaboration to continuously deliver on our customer promise—and have fun doing it.

Responsibilities

• Develop, test, document, and deploy high‑quality mobile software—primarily using Kotlin and Jetpack Compose, with opportunities to contribute across platforms.
• Build and evolve UI and business logic using Compose and shared Kotlin code, aligning with our cross‑platform strategy.
• Deliver key features end‑to‑end, from functional requirements through implementation, testing, release, and iteration.
• Build scalable, maintainable code that aligns with our mobile architecture and long‑term product goals.
• Collaborate closely with product managers, designers, and engineers across platforms to create intuitive, performant user experiences.
• Participate in technical design and architecture discussions, bringing thoughtful opinions and a growth mindset to cross‑platform problem‑solving.
• Contribute to and help shape our Kotlin Multiplatform Mobile (KMM) and Compose Multiplatform codebases, expanding shared logic and UI where appropriate.
• Participate in our on‑call rotation and help resolve production issues with urgency and care for the customer experience.
• Engage in code reviews to uphold quality standards, share knowledge, and promote continuous improvement.
• Improve testability, reliability, and team documentation while identifying and executing on opportunities for refactoring and tech debt reduction.
• Help onboard and mentor junior engineers and interns, contributing to a strong team culture rooted in learning and collaboration.
• Contribute to sprint planning, estimation, and retrospective processes with an eye toward team velocity and continuous improvement.
• Develop a solid understanding of the iCasino product, customer segments, and how we deliver entertainment‑first experiences.
• Be open to occasional travel to Fanatics offices and events for planning, collaboration, and team‑building activities.

Required Qualifications

• 5+ years of professional mobile development experience, with strong Kotlin expertise.
• Hands‑on experience building production mobile apps using Jetpack Compose.
• Experience with or strong interest in Kotlin Multiplatform Mobile (KMM) and/or Compose Multiplatform.
• Solid understanding of mobile architecture, app lifecycle, state management, and modern UI design principles.
• Demonstrated ability to deliver high‑quality, maintainable code in a collaborative, Agile environment.
• Strong problem‑solving and debugging skills, especially in production environments.
• Clear, thoughtful communicator—comfortable discussing technical trade‑offs with engineers, product managers, and designers.
• Growth mindset with a passion for learning new technologies and improving the customer experience.
• Comfortable working in fast‑paced, evolving environments with shifting priorities and tight feedback loops.

Preferred Qualifications

• Experience with Compose Multiplatform and/or advanced usage of Kotlin Multiplatform Mobile (KMM) in production.
• iOS development experience using Swift and SwiftUI.
• Familiarity with backend systems, REST APIs, and collaboration with backend and platform engineers.
• Experience building and maintaining apps in a CI/CD environment with tools like GitHub Actions, Bitrise, or similar.
• Understanding of observability practices (e.g., logging, crash reporting, performance monitoring) and a commitment to operational excellence.
• Previous contributions to team standards, mentoring, onboarding, or shared libraries.
• Exposure to hyper‑growth or startup environments, where velocity and MVP‑thinking are core to delivery.
• Passion for the iCasino space, mobile gaming, or building entertainment‑first user experiences.

Not sure if you check every box?

If you're excited about this role, passionate about Kotlin and modern mobile development, curious about Compose Multiplatform or KMM, and interested in building world‑class mobile experiences across platforms—we encourage you to apply. We believe great engineers come from all kinds of backgrounds. We value potential, passion, and a growth mindset just as much as specific tool experience. Unfortunately, we do not offer sponsorship and you do need to be living in the UK to apply.

Job Info

• Posting Date 01/12/2026, 07:32 PM
• Locations Richmond House, Leeds, LS16 6QY, GB (Remote)