Staff Mobile Engineer - Kotlin, iCasino - FBG in Leeds

As a Staff Software Engineer – Mobile at Fanatics Betting & Gaming (FBG), you will shape the future of mobile architecture while driving delivery of high‑impact features.

You will work closely with product managers, designers, and backend engineers to create intuitive, high‑performance user experiences across a scalable platform.

Responsibilities

• Define and evolve the mobile architecture and cross‑platform strategy, focusing on Kotlin Multiplatform Mobile (KMM) and Compose Multiplatform.
• 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 for 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 opportunities to reduce technical debt, improve system design, and enable faster iteration.
• 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 i Casino product, customer segments, and how we deliver entertainment‑first experiences at scale.
• Travel occasionally to Fanatics offices and events for planning, collaboration, and team‑building activities.

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.
• Deep experience with Compose Multiplatform and advanced KMM usage in production environments.
• i OS development experience using Swift and Swift UI, 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.
• Additional Information
• Relocation: Leeds, United Kingdom – Salary: £55,746 per year (estimated).
• This role requires residing in the United Kingdom or Ireland; sponsorship is not offered.
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