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Core Engineering Java Development Lead – FX Tech

United Kingdom, London Employment contract · Job Posted May 28, 2026
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Job Description

Engineer the future of global finance. At Citi, our Tech team doesn't just support finance – we are helping to redefine it. Every day, $5 trillion crosses through our network. We do business in 180+ countries operating at a scale few can match. From deploying advanced AI to helping shape global markets, we build systems that matter. Look to join a team where your work helps influence economies, your ideas can drive innovation and outcomes, and your growth is backed by mentorship, continuous learning and flexibility with potential hybrid work opportunities. Help solve real-world challenges that touch millions and get the opportunity to build the future of finance with Citi Tech. This is a hands-on role for a Java expert who enjoys building high-quality robust and scalable services, shaping technical direction, and working with modern event-driven architectures. You'll play a key role in designing, building and evolving core services, working closely with other senior engineers and quants. While you'll have influence over technical decisions, this role is firmly rooted in delivery - ideal for someone who loves writing code, solving complex problems, and continuously raising engineering standards.

Job Responsibility

  • Designing, developing and maintaining high-performance Java services that are scalable, secure and resilient
  • Applying Domain-Driven Design and message-/event-driven design principles to build loosely coupled, well-structured systems
  • Writing clean, maintainable code and contributing to peer reviews, championing best practices and continuous improvement
  • Helping modernise and evolve existing platforms, balancing pragmatic delivery with long-term architectural health
  • Working closely with trading, quants and fellow engineers to turn complex business requirements into robust technical solutions
  • Contributing to improvements in build tooling, CI/CD pipelines, testing approaches and overall engineering productivity
  • Supporting systems in production, improving observability, performance and resilience

Requirements

  • Proven experience building backend systems using Java and frameworks such as Spring with deep understanding of the JVM ecosystem
  • experience using AI tooling to accelerate design exploration, prototyping and embedding AI capabilities into product workflows and services
  • Experience designing systems using event-driven approaches (e.g. Solace, Kafka, Web Sockets or similar technologies), with a solid grounding in Domain-Driven Design
  • Strong grasp of SOLID principles, design patterns, dependency injection and persistence technologies
  • Solid knowledge of algorithms and data structures, with the ability to reason about performance, complexity and scalability
  • Experience building software for cloud environments, including containerization and modern deployment practices
  • Understanding of secure coding practices, fault tolerance and building reliable systems in distributed environment

What we offer

  • 27 days annual leave (plus bank holidays)
  • A discretional annual performance related bonus
  • Private Medical Care & Life Insurance
  • Employee Assistance Program
  • Pension Plan
  • Paid Parental Leave
  • Special discounts for employees, family, and friends
  • Access to an array of learning and development resources

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