Senior Software Engineer - Backend

About the role

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 Markets: Fanatics Markets is the real-money prediction and trading app where you can invest in moments you care about. Built on a secure platform, we let users predict real-world outcomes and trade on events they actually follow, from sports and entertainment to political elections and beyond. Our mission is to redefine how fans engage with the moments and markets that matter most. We're looking for the right people to help us build the future of prediction markets. This Senior Software Engineer (Backend) role is a senior-level IC with significant ownership over the core trading platform underpinning all FMX operations. You will join a greenfield team building new services in Go, working alongside engineers with deep backgrounds in regulated financial infrastructure. You will lead by example, establishing best practices for AI-assisted development while building systems that must meet the reliability, latency, and auditability standards of a regulated product. We're pioneering the use of AI as a code collaborator. We need engineers who have gone beyond experimentation and who actively use Claude Code, Cursor, Codex, GitHub Copilot, or similar tools to ship production code faster while maintaining exceptional quality standards.

Responsibilities

• Lead the design, development, testing, and deployment of high-performance, fault-tolerant backend services supporting the FMX trading platform.
• Own services and features end-to-end: spec writing → implementation → instrumentation → deployment → monitoring → iteration based on metrics.
• Work within and help modernise a Java codebase while contributing to new service development in Go, Java and Kotlin.
• Contribute to the architecture for order processing, market data distribution, and trade lifecycle management on a regulated product.
• Build and maintain reliable daily reporting pipelines, ensuring data integrity and full audit trails across all trading activity.
• Participate in 24/7 on-call rotations; contribute to SLO definition, alerting strategy, and incident response for mission-critical trading infrastructure.
• Model and manage data for contracts, orders, positions, and settlements with an emphasis on correctness, integrity, and regulatory auditability.
• Collaborate with the DevOps/Platform team to ensure services are observable, scalable, and compliant with MNPI and insider trading restrictions.
• Conduct thorough code reviews, raising the bar on code quality, readability, security, and maintainability.
• Leverage AI tools to accelerate development velocity while maintaining high standards for security, correctness, and regulatory compliance.
• Establish and document team standards for AI usage (prompt patterns, code review checklists, validation strategies).
• Contribute to a fast-paced 0→1 environment, unblocking others and taking initiative where processes are still being defined.

Requirements

• 4+ years of experience building highly scalable, high-performance backend applications or distributed systems.
• Background in regulated exchange or financial infrastructure strongly preferred - brokerage, futures/derivatives exchanges (CBOE, CME, ICE), or similar CFTC/SEC-regulated environments.
• Production experience with Java; Go experience or a strong demonstrated desire to work in Go.
• Experience with event-driven architectures (Kafka, Kinesis, PubSub, or similar) in a financial or high-throughput context.
• Strong understanding of data integrity and transaction management in PostgreSQL or equivalent RDBMS, including financial-grade data modelling.
• Solid grasp of software design principles (SOLID, DRY) and testing methodologies (unit, integration, end-to-end).
• Familiarity with CFTC compliance requirements, MNPI handling, and audit trail obligations in a

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