Senior Java Developer – Low-Latency Microservices (Hybrid)

Citigroup; Belfast City District; Hybrid; GBP 62,000 - 102,000; Full time

Benefits offered by this job

27 days annual leave

Private medical care

Life insurance

Pension plan

Employee assistance program

Learning resources

Job summary

Citigroup in Belfast invites an experienced Java developer to join a global technology team to build scalable services for trading platform monitoring, reconciliation, and resilience in a hybrid model.

The role requires strong Java, REST, messaging systems, and containerized microservices with Docker/Kubernetes. Collaborate across time zones, participate in design sessions, and adopt new tools while delivering high-performance, low-latency solutions.

Qualifications

• 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.

Skills

Java development

REST API

OAuth

Basic Authentication

Kafka

NATS

Solace

Tibco

RabbitMQ

SQL

Oracle

SQL Server

Hadoop

Java multithreading

SOAP

DB2

JMS

MQ

NDM

SFTP

Distributed systems

Docker

Kubernetes

C++

C#

SBE

JNI

Distributed teams

Education

Bachelor's degree in Computer Science/Engineering/IT

Tools

Docker

Kubernetes

Kafka

NATS

RabbitMQ

TIBCO

Oracle

SQL Server

DB2

Hadoop

Job description

Citigroup in Belfast invites an experienced Java developer to join a global technology team to build scalable services for trading platform monitoring, reconciliation, and resilience in a hybrid model.

The role requires strong Java, REST, messaging systems, and containerized microservices with Docker/Kubernetes. Collaborate across time zones, participate in design sessions, and adopt new tools while delivering high-performance, low-latency solutions.