Top Java Developer Jobs in Belfast

Lead design, development, and implementation of scalable backend systems in Java. Provide technical leadership, architecture guidance, code reviews, mentor developers, optimize databases (RDBMS and NoSQL), and drive CI/CD and microservices delivery.

Design, develop, and maintain scalable, high-performance backend applications using Java and the Spring ecosystem. Participate across the SDLC, optimize performance, troubleshoot production issues, conduct code reviews, mentor junior developers, and collaborate with product and architecture teams.

The Java Engineer will design and implement scalable solutions, utilizing Java and AWS, while collaborating with cross-functional teams and ensuring agile best practices.

The Software Engineer II role involves developing new features, maintaining services, collaborating with teams, and ensuring products meet customer needs.

Develop and maintain productivity and tooling solutions for Citi developers using Java/SpringBoot microservices on Linux/OpenShift. Build APIs, own SDLC activities, support deployments and CI/CD pipelines, and act as a subject matter expert and consultant to global developer teams.

Develop Java software solutions, applying object-oriented principles, utilizing cloud technologies like AWS, and collaborating with teams. Lead projects and problem-solve with clients.

The Java Engineer role involves developing complex software solutions primarily using Java, focusing on multi-threading and performance optimization while collaborating across teams.

The Java Engineer will develop software solutions using Java, focusing on multi-threading and performance optimization, while collaborating with teams and stakeholders.

As a Senior Java Developer, you'll lead software development using Java and AWS, collaborating in an Agile team, adhering to best practices, and creating maintainable solutions.

Lead design, develop, and deploy enterprise Java backend and ReactJS front-ends; architect RDBMS and NoSQL solutions; improve CI/CD pipelines; mentor engineers; perform code reviews; troubleshoot full-stack issues; collaborate with product and design; explore integrating AI technologies.

Responsible for designing, developing, testing, and deploying high-quality software solutions, mentoring junior developers, and optimizing performance in a collaborative Agile environment.

Responsible for training large-language models by reviewing, ranking, and improving AI-generated code. Requires strong software engineering skills.

As a Senior Software Engineer, you'll develop high-quality software solutions, mentor junior members, apply best practices in design and build, and contribute to technical decisions in a collaborative environment.

Develop and implement a proprietary streaming media product using Java and modern web technologies, collaborating with cross-functional teams and ensuring scalable solutions.

As a Senior Software Engineer at Westpac, you'll design and maintain Java-based solutions for fraud and financial crime platforms, collaborating with teams and mentoring junior engineers in an agile environment.

Evaluate, rank, repair, and refactor AI-generated code to improve correctness, efficiency, and style; provide detailed written feedback for RLHF pipelines; and help maintain the code-evaluation and training workflow remotely.

Seeking a Senior Software Engineer with expertise in Kotlin or Java to enhance developer platforms and internal tools at Citi's CTO organization, focusing on server-side engineering and modern databases.

The Senior Java Backend Engineer will lead backend development for a migration project in a complex AWS environment, focusing on automating the actuarial lifecycle in Reinsurance and ensuring alignment with architectural standards.

Citi seeks a Senior Software Engineer (Java) to design and develop complex, high-performance systems for fixed income trade processing, utilizing Java and Spring technologies.

The role involves building scalable digital solutions in Java, collaborating with teams, conducting code reviews, and mentoring junior engineers.

As a Senior Product Engineer at Secfix, you will design, build, and maintain backend systems, collaborating with product teams and mentoring junior engineers, while leveraging AI tools for development.

The role involves optimizing Elasticsearch for high performance in distributed systems, managing clustering coordination, and resolving complex issues.

Design, develop, and deliver enterprise-grade full-stack solutions using Java, Node.js, Next.js, React, SQL Server and Couchbase. Build scalable microservices, CI/CD pipelines, containerized deployments, automated tests, and documentation while collaborating across teams and leveraging AI tools to improve code quality.