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About the Role

This Senior Software Engineer (Backend) role is a senior-level individual contributor 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 and need engineers who have gone beyond experimentation and actively use AI 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 regulated trading environment.
Experience with CI/CD pipelines, automated testing, and safe deployment practices for backend services.
Production reliability experience: monitoring, logging, alerting, on-call, and SLO definition.
Demonstrated experience using AI tools (Claude Code, Cursor, Copilot, etc.) to ship production code; able to articulate specific workflow improvements.
Communicates complex technical concepts clearly to engineering, compliance, and business stakeholders.
Thrives in a fast-paced, high-growth environment where priorities evolve and decisions are made quickly.

Skills

Go
Java
Kotlin
PostgreSQL
SOLID
DRY
Kafka
Kinesis
PubSub
CI/CD
AI tools (Claude Code, Cursor, Copilot)

Location

United Kingdom

Work Type

Remote
Full-time

Experience Level

Senior

Benefits

Home office setup stipend

About the Company

Fanatics is building a leading global digital sports platform, igniting the passions of global sports fans and maximizing the presence and reach for its hundreds of sports partners globally by offering products and services across Fanatics Commerce, Fanatics Collectibles, and Fanatics Betting & Gaming.
Fanatics Markets is the real-money prediction and trading app where users can invest in moments they care about, predict real-world outcomes, and trade on events they follow.
The company has an established database of over 100 million global sports fans, a global partner network with approximately 900 sports properties, 2,500 athletes and celebrities, and over 2,000 retail locations.
More than 22,000 employees are committed to relentlessly enhancing the fan experience and delighting sports fans globally.

Equal Opportunity

If you possess some of these skills but not all of them, we still encourage you to apply!
Visa sponsorship is not available for this position.
We are open to fully remote candidates based in the United Kingdom.