Senior Java Backend Engineer | Spring Boot & Data Pipelines

Citi Group; Belfast City District; Hybrid; GBP 70,000 - 110,000; Full time

Benefits offered by this job

Generous holiday allowance

Annual performance bonus

Private medical insurance

Employee Assistance Program

Pension Plan

Paid Parental Leave

Learning and development resources

Job summary

Citi Belfast is seeking a Senior Java Backend Engineer to build scalable backend services and ingestion pipelines for VMC, an enterprise-scale registry platform. You will own REST APIs, collaboration with frontend teams, and apply GenAI tooling to accelerate development.

The role emphasizes high-throughput design, robust data models, and strong testing culture within a hybrid, globally-collaborative environment.

Qualifications

• Bachelor's degree in Computer Science or related field.
• Strong Java and Spring Boot experience.
• Proven experience designing RESTful APIs and microservices.
• Experience with relational databases and SQL optimization.
• Experience with data ingestion, ETL, or batch processing pipelines.
• Solid testing discipline and familiarity with JUnit/Mockito.
• Familiarity with CI/CD pipelines and Docker-based deployments.

Responsibilities

• Design, build, and maintain production-grade REST APIs and microservices using Java 21/25 and Spring Boot.
• Build resilient ETL and reconciliation services ingesting monthly datasets from multiple upstream sources.
• Design relational schemas and optimize SQL queries with transactional integrity and audit logs.
• Collaborate with frontend teams to integrate APIs with data grids and bulk workflows.
• Leverage GenAI tooling for rapid prototyping, scaffolding, and test generation.
• Maintain high code quality with TDD/BDD and automated CI/CD pipelines.
• Mentor engineers across global teams and take ownership within the Belfast squad.

Skills

Java

Spring Boot

RESTful APIs

Microservices

SQL databases

ETL/Data ingestion

CI/CD

JUnit/Mockito

Docker

Git

Linux

Education

Bachelor's degree in Computer Science or related field

Tools

PostgreSQL

Oracle

MySQL

Kafka

Testcontainers

Jenkins

Tekton

Maven

Gradle

Docker

Git

Linux

Job description

Citi Belfast is seeking a Senior Java Backend Engineer to build scalable backend services and ingestion pipelines for VMC, an enterprise-scale registry platform. You will own REST APIs, collaboration with frontend teams, and apply GenAI tooling to accelerate development.

The role emphasizes high-throughput design, robust data models, and strong testing culture within a hybrid, globally-collaborative environment.