Senior Java Developer

Salary: £62,000 – 102,000 per year

Requirements:

• Strong commercial experience as a Java developer.
• Experience in REST API and authentication mechanisms such as OAuth and Basic Authentication.
• Experience with messaging systems and middleware technologies such as Kafka, NATS, Solace, Tibco, or RabbitMQ.
• Experience working with SQL and databases such as Oracle, SQL Server, or Hadoop.
• Experience with Java multithreading and concurrency, web services such as SOAP and REST, DB2, JMS, MQ, NDM, and SFTP.
• Familiarity with industry best practices and standards, software development tools, and techniques.
• Experience developing distributed systems.
• Experience using containers such as Docker and Kubernetes.
• Experience in low-latency software development in a microservices environment, high-performance architectures, and high-throughput applications is a plus.
• Experience in C++ or C# is beneficial.
• Experience in SBE is desirable.
• Experience with JNI is a plus.
• Ability to work with distributed teams across multiple time zones.
• Bachelors degree in Computer Science, Engineering, Information Technology, or a similar discipline.

Responsibilities:

• Build and maintain common solutions for trading platform monitoring, trade reconciliation, application recovery, and other essential support functions.
• Participate in design sessions with the development team, including employees and vendors across multiple locations.
• Evaluate and adopt new development tools, libraries, and approaches to improve delivery quality and align with the latest industry trends.
• Analyze existing software systems and propose solutions to improve overall design, architecture, and efficiency.
• Communicate with stakeholders to help shape requirements and design decisions.
• Liaise with production support teams in troubleshooting and debugging applications.
• Ensure best practices and standards are followed throughout the application development life cycle.
• Provide user and support documentation.
• Ensure applications meet performance and scalability requirements.
• Work comfortably with AI-based coding assistants and AI-powered SDLC processes.
• Drive applications development through hands-on development and bug fixes of our Java application.

Technologies:

• AI
• API
• C#
• Docker
• Hadoop
• Support
• Java
• Kafka
• Kubernetes
• NATS
• OAuth
• Oracle
• REST
• RabbitMQ
• SOAP
• SQL
• TIBCO
• Unity
• Web
• microservices
• GameDev
• Network

More:

We are Citi, a global financial services company with a technology team helping to redefine finance at scale. Our Unity platform provides a global reference for business transactions across Citi, supporting traceability across the full transaction lifecycle from front office to back office. This full-time role is based in Belfast, Northern Ireland, and offers a business casual workplace with a hybrid working model of up to 2 days working from home per week.

• a competitive base salary
• annual review
• 27 days of annual leave plus bank holidays
• a discretionary annual performance-related bonus
• private medical care and life insurance
• an employee assistance program
• pension plan
• paid parental leave
• special discounts for employees, family and friends
• access to learning and development resources

last updated 36 week of 2026

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