Middle Office Engineer

City of London Full-Time No home office possible

Overview

GBX is BGC\’s flagship platform for electronic trading solutions in the Credit and Rates markets. Used by thousands of brokers and traders daily, GBX is a strategic priority of the firm\’s growth strategy. We are seeking a senior backend engineer to join our GBX Middle Office team, which supports real-time trade data transformation and integration. This role is critical to ensuring the reliability, scalability, and efficiency of our post-trade processing infrastructure. You\’ll work in a production-grade environment with high complexity, collaborating with global stakeholders to deliver robust, maintainable solutions and drive technical improvements across the platform.

Responsibilities

Develop new business features and improve existing system capacity
Work on system architecture, code quality, and delivery best practices
Analyze and modernize legacy components to simplify architecture and improve maintainability
Improve testability, CI/CD, deployment reliability, and system observability
Troubleshoot real-time trade data processing and integration issues
Collaborate with QA, support, and business stakeholders

Qualifications

5+ years of professional Java experience
Strong CS fundamentals and problem-solving ability
Proficient with SQL and generic scripting
Proficient with Linux server environments
Background in CI/CD, infrastructure automation, and monitoring
Experience working with large, interconnected systems and debugging across components
Proven ability to simplify complex systems and improve deployment/testability
Strong communication skills and team orientation
Demonstrated ownership mindset and strong work ethic; ability to think clearly under complexity and ambiguity
Appreciation for production systems, product context, and long-term maintainability—not just feature delivery or ticket completion