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# Java Full Stack Developer

- **Company:** Citigroup Inc.
- **Location:** Belfast, UK (Remote available)
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Microsoft Excel, Application Programming Interfaces (APIs), Artificial Intelligence, Automation of Tests, Unit Testing, Batch Processing, Code Review, Data Governance, Extract Transform Load (ETL), Relational Databases, Cursor, Linux, File Systems, Gradle, Junit, PostgreSQL, Apache Maven, Message Broker, MySQL, OpenShift, Oracle (Applications), Parsing, Performance Tuning, Rapid Prototyping Process, Mockito, Microsoft Copilot, Secure Coding, Software Engineering, SQL Databases, Data Streaming, Transaction Data, TypeScript, Working Model 2D, Enterprise Application Integration, Freeform SQL, Data Ingestion, GitHub Copilot, ReactJS, Spring-boot, Indexer, Backend, Git, Containerization, Integration Tests, Information Technology, Apache Kafka, Front End Software Development, Restful APIs, Docker, Jenkins, Microservices
- **Published:** November 6, 2026
- **Apply:** https://citi.wd5.myworkdayjobs.com/2/job/Belfast--United-Kingdom/Full-Stack-Developer-with-Angular_261005991/apply

## About the Role

* 5-8+ years of hands-on software development experience with core focus on Java (21/25) and Spring / Spring Boot.
 * Strong foundation in RESTful API design, microservice architecture, and enterprise integration patterns.
 * Deep expertise in relational databases (SQL), schema design, data indexing, transactions, and performance tuning (PostgreSQL, Oracle, or MySQL).
 * Solid experience building data ingestion, transformation, or batch processing pipelines.
 * Strong testing discipline: unit testing, integration testing, and mock frameworks (JUnit, Mockito, Testcontainers).
 * Experience with modern DevOps pipelines (Git, Maven/Gradle, Jenkins/Tekton, Docker, Linux).

Nice-to-Have / Full-Stack Plus:

 * Experience or familiarity with React, TypeScript, or modern frontend SPAs (state management, component design, data grids).
 * Familiarity with client/server Excel file processing (.xlsx generation, bulk upload parsing).
 * Experience working with autonomous AI engineering agents (e.g., Devin) or AI-assisted coding tools.
 * Experience with message brokers or event streaming (Kafka, MQ)., * Education: Bachelor's degree in Computer Science, Software Engineering, or equivalent practical experience.
 * Autonomy & Judgment: Ability to operate with limited direct supervision, make sound architectural choices, and deliver features independently.
 * Communication: Strong English communication skills and ability to collaborate across distributed global teams (India, UK, US).
 * Risk & Controls: Sound understanding of secure coding practices, data governance, and enterprise security standards.

## Description

We are looking for a Senior Java Backend Engineer (C12) in Belfast to join the core engineering team building Vendor Master Central (VMC)-an enterprise-scale registry platform responsible for ingesting, reconciling, and managing millions of market data service records, contracts, and vendor hierarchies.

This role is backend-first, centered on designing high-throughput ingestion pipelines, resilient Spring Boot microservices, clean RESTful APIs, and domain data models. Experience or interest in Full Stack development with React/TypeScript is a strong plus, enabling end-to-end feature ownership from backend services up to user-facing web tools.

We actively embrace GenAI-assisted engineering (Devin, GitHub Copilot, Cursor) to automate boilerplate, accelerate unit testing, and achieve high engineering velocity., * Backend Microservices: Design, build, and maintain production-grade REST APIs and microservices using Java 21/25 and Spring Boot.

 * Data Ingestion & Processing: Build resilient ETL and reconciliation services that ingest, validate, and deduplicate complex monthly datasets from multiple upstream sources into a unified data model.
 * Data Modeling & Storage: Design relational schemas (PostgreSQL / Oracle), optimize complex SQL queries, and implement transactional data integrity, staging layers, and immutable audit logs.
 * Full Stack Collaboration (Bonus): Partner with or contribute to the React/TypeScript frontend to integrate APIs seamlessly with data grids, curation drawers, and bulk Excel upload workflows.
 * GenAI Velocity: Leverage AI-powered developer tooling (Devin, Copilot, Cursor) for rapid prototyping, component scaffolding, and automated test coverage.
 * Engineering Excellence: Drive high code quality through TDD/BDD (JUnit 5, Mockito), automated CI/CD pipelines, containerization (Docker/OpenShift), and code reviews.
 * Mentorship & Ownership: Act as a technical pillar within the Pune agile squad, collaborating with global teams and mentoring junior engineers., This job description provides a high-level review of the types of work performed. Other job-related duties may be assigned as required.