Staff Software Engineer – Mobile (Kotlin / Multiplatform) Overview

As a Staff Software Engineer – Mobile at Fanatics Betting & Gaming (FBG), you are a highly experienced individual contributor and technical leader with deep expertise in Kotlin-based mobile development and a strong track record of shaping mobile architecture at scale. You bring expert-level experience with Kotlin and Jetpack Compose, along with proven ownership or strong experience driving Kotlin Multiplatform Mobile (KMM) and Compose Multiplatform strategies.

You operate as a technical authority and force multiplier, setting direction across teams, influencing architectural decisions, and elevating engineering standards. You thrive in a fast-paced, product-driven environment where your combination of hands-on delivery, strategic thinking, and cross-functional leadership has a measurable impact on both engineering outcomes and customer experience.

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. As a Staff Engineer, you will play a key role in evolving this ecosystem—driving cross-platform strategy, platform consistency, and engineering excellence across teams.

Responsibilities

• Define and evolve the mobile architecture and cross-platform strategy, with a focus on scaling KMM and Compose Multiplatform across the organisation.
• Lead complex technical design and architectural decisions, balancing speed, scalability, maintainability, and user experience.
• Build and contribute to shared mobile platforms, libraries, and reusable components, enabling consistency and velocity across teams.
• Deliver high-impact features and platform improvements hands-on, particularly in Kotlin and Jetpack Compose.
• Drive adoption of best practices in mobile engineering, including modularisation, state management, testing, and performance optimisation.
• Partner closely with product managers, designers, and backend engineers to deliver intuitive, high-performance user experiences.
• Identify and execute on opportunities to reduce technical debt, improve system design, and enable faster iteration across teams.
• Own and improve developer experience, including tooling, CI/CD pipelines, and release processes.
• Define and influence mobile observability, performance monitoring, and reliability standards.
• Play a key role in incident response and on-call practices, helping improve production stability and response effectiveness.
• Mentor and guide engineers across teams, contributing to a strong culture of technical excellence and continuous learning.
• Influence engineering direction across squads, aligning teams to a cohesive mobile platform vision.
• Contribute to hiring, onboarding, and raising the technical bar across the organisation.
• Develop a deep understanding of the iCasino product, customer segments, and how we deliver entertainment-first experiences at scale.
• Be open to occasional travel to Fanatics offices and events for planning, collaboration, and team-building activities.

Required Qualifications

• 8+ years of professional software engineering experience, with deep expertise in mobile development and strong Kotlin proficiency.
• Extensive hands-on experience building production mobile applications using Jetpack Compose.
• Proven experience with or ownership of Kotlin Multiplatform Mobile (KMM) and/or Compose Multiplatform in real-world environments.
• Strong understanding of mobile architecture, app lifecycle, state management, and performance optimisation at scale.
• Demonstrated experience leading technical direction and architectural decisions as a senior individual contributor.
• Track record of delivering scalable, maintainable systems in complex, fast-moving environments.
• Strong problem-solving and debugging skills, including production incident ownership and resolution.
• Ability to influence and collaborate across teams, aligning stakeholders on technical strategy and trade-offs.
• Clear, effective communicator—comfortable engaging with engineers, product managers, and leadership.
• Experience operating in fast-paced, product-driven environments with evolving priorities.

Preferred Qualifications

• Deep experience with Compose Multiplatform and advanced KMM usage in production environments.
• iOS development experience using Swift and SwiftUI, or strong cross-platform mobile understanding.
• Experience building or contributing to shared mobile platforms or developer tooling.
• Strong familiarity with CI/CD pipelines, release automation, and mobile build systems.
• Experience with observability tooling, performance monitoring, and improving production reliability.
• Background in high-scale consumer applications, gaming, betting, or entertainment platforms.
• Experience influencing engineering culture, mentoring engineers, and scaling best practices across teams.
• Exposure to experimentation, personalisation, or data-driven product development.

Not sure if you check every box?

If you're excited about this role, passionate about Kotlin and modern mobile architecture, and motivated by the opportunity to shape cross-platform strategy at scale, we encourage you to apply.

We believe great engineers come from all kinds of backgrounds. We value impact, technical leadership, 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 or Ireland to apply.

Same Posting Description for Internal and External Candidates