Senior Full Stack Engineer, Growth

Fanatics Collectibles•Los Angeles, CA

4h•$144,640 - $200,000

About The Position

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. Fanatics Collectibles is a new company operating at the intersection of collectibles, culture, and technology. Backed by world-class investors, operators, and sports & entertainment partners, we are building the global leader in next-generation collectibles. As part of the broader Fanatics ecosystem, we leverage a digital sports platform that spans over 900 sports properties and engages more than 81 million fans. Together, we are reimagining every part of the collectibles experience for fans, partners, and creators. Topps.com is a flagship platform within Fanatics Collectibles. We're building the gold standard for collectors through immersive, commerce-integrated experiences across Topps, Fanatics Live, and Fanatics Collect. Our mission is to deliver performant systems, high design polish, and data-driven growth experiences that engage the next generation of fans. We’re hiring a Senior Full Stack Software Engineer to join the Growth Engineering team, focused on driving user acquisition, engagement, and retention across Topps, Fanatics Live, and Fanatics Collect. This role sits at the intersection of product experimentation, analytics, and platform engineering. You will be responsible for ensuring the integrity and reliability of analytics data across platforms, while building and iterating on growth-focused features for both web and mobile experiences. You’ll work closely with product, data, and marketing teams to design, implement, and scale experimentation frameworks and growth initiatives. This role reports to the Director of Engineering, Topps.

Requirements

5–8+ years of experience building and scaling modern web applications across frontend and backend.
Strong proficiency in full stack development (e.g., JavaScript/TypeScript, React, Node.js, or similar technologies).
Experience implementing and maintaining analytics tracking systems (e.g., event pipelines, tagging, attribution).
Familiarity with A/B testing frameworks, experimentation platforms, and feature flagging systems.
Experience building data-informed product features with measurable business impact.
Solid understanding of API design, system architecture, and performance optimization.
Strong collaboration skills and ability to work cross-functionally with product, analytics, and marketing teams.
Ability to operate in a fast-paced environment with a focus on delivering incremental value.

Nice To Haves

Experience working on growth engineering or product growth teams.
Familiarity with tools such as Segment, Amplitude, Snowflake, or similar analytics/data platforms.
Experience building for mobile platforms (React Native, native iOS/Android, or mobile web optimization).
Exposure to consumer-facing products with high traffic and experimentation velocity.
Interest in collectibles, live commerce, or fan engagement.

Responsibilities

Build and maintain full stack features that drive user growth, engagement, and conversion across Topps, Fanatics Live, and Fanatics Collect.
Ensure analytics data integrity and consistency across platforms, including instrumentation, tracking pipelines, and validation frameworks.
Design and implement experimentation frameworks (A/B testing, feature flags, ) to enable rapid iteration on growth initiatives.
Partner with product, data science, and marketing teams to translate growth hypotheses into scalable technical solutions.
Develop and optimize web and mobile experiences with a focus on performance, usability, and measurable impact on key growth metrics.
Identify and resolve gaps in data tracking, attribution, and reporting that impact decision-making.
Contribute to shared platform capabilities that support cross-product growth initiatives.
Continuously improve engineering velocity through tooling, automation, and best practices.