Back to jobs

Staff Mobile Engineer / Kotlin

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.

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.

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/

Create a Job Alert

Interested in building your career at Fanatics Betting & Gaming? Get future opportunities sent straight to your email.

Apply for this job

*

indicates a required field

Resume/CV

Accepted file types: pdf, doc, docx, txt, rtf

Cover Letter

Accepted file types: pdf, doc, docx, txt, rtf

Select...
Select...
Select...
Select...
Select...
Select...
Select...
Select...

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 hiring process or thereafter. Any information that you do provide will be recorded and maintained in a confidential 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.

Select...
Select...
Race & Ethnicity Definitions

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 measure the effectiveness of the outreach and positive recruitment efforts we undertake pursuant to VEVRAA. Classification of protected categories is 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.

Select...

Voluntary Self-Identification of Disability

Form CC-305
Page 1 of 1
OMB Control Number 1250-0005
Expires 04/30/2026

Why are you being asked to complete this form?

We are a federal contractor or subcontractor. The law requires us to provide equal employment opportunity to qualified people with disabilities. We have a goal of having at least 7% of our workers as people with disabilities. The law says we must measure our progress towards this goal. To do this, we must ask applicants and employees if they have a disability or have ever had one. People can become disabled, so we need to ask this question at least every five years.

Completing this form is voluntary, and we hope that you will choose to do so. Your answer is confidential. No one who makes hiring decisions will see it. Your decision to complete the form and your answer will not harm you in any way. If you want to learn more about the law or this form, visit the U.S. Department of Labor’s Office of Federal Contract Compliance Programs (OFCCP) website at www.dol.gov/ofccp.

How do you know if you have a disability?

A disability is a condition that substantially limits one or more of your “major life activities.” If you have or have ever had such a condition, you are a person with a disability. Disabilities include, but are not limited to:

  • Alcohol or other substance use disorder (not currently using drugs illegally)
  • Autoimmune disorder, for example, lupus, fibromyalgia, rheumatoid arthritis, HIV/AIDS
  • Blind or low vision
  • Cancer (past or present)
  • Cardiovascular or heart disease
  • Celiac disease
  • Cerebral palsy
  • Deaf or serious difficulty hearing
  • Diabetes
  • Disfigurement, for example, disfigurement caused by burns, wounds, accidents, or congenital disorders
  • Epilepsy or other seizure disorder
  • Gastrointestinal disorders, for example, Crohn's Disease, irritable bowel syndrome
  • Intellectual or developmental disability
  • Mental health conditions, for example, depression, bipolar disorder, anxiety disorder, schizophrenia, PTSD
  • Missing limbs or partially missing limbs
  • Mobility impairment, benefiting from the use of a wheelchair, scooter, walker, leg brace(s) and/or other supports
  • Nervous system condition, for example, migraine headaches, Parkinson’s disease, multiple sclerosis (MS)
  • Neurodivergence, for example, attention-deficit/hyperactivity disorder (ADHD), autism spectrum disorder, dyslexia, dyspraxia, other learning disabilities
  • Partial or complete paralysis (any cause)
  • Pulmonary or respiratory conditions, for example, tuberculosis, asthma, emphysema
  • Short stature (dwarfism)
  • Traumatic brain injury
Select...

PUBLIC BURDEN STATEMENT: According to the Paperwork Reduction Act of 1995 no persons are required to respond to a collection of information unless such collection displays a valid OMB control number. This survey should take about 5 minutes to complete.