Java Developer

JUXT; Greater London; On-site; GBP 70,000 - 110,000; Full time

Job summary

JUXT in London is seeking senior to principal Java developers to join long-term greenfield projects with a leading financial institution. You will work in small, high-calibre teams delivering rebuilds and modernisation, replacing legacy systems with cloud-aligned Java solutions.

There is emphasis on writing great code, shaping architecture, and owning end-to-end contributions. You will join teams tackling genuinely greenfield, strategic rebuilds with autonomy and clear ownership in a friendly

Qualifications

• Strong Java + Spring Framework experience.
• Experience with OpenID Connect.
• Experience with PostgreSQL databases.
• Solid understanding of Kubernetes environments.

Responsibilities

• Develop greenfield Java services for a major financial institution in London.
• Contribute to a non-AI-based rewrite platform based on OpenRewrite.
• Rewrite Talend data transformation jobs as the first project, influencing architecture and implementation.

Skills

Java

Spring Framework

OpenID Connect

PostgreSQL

Kubernetes

Job description

We are looking for Java developers, from experienced seniors to hands-on principal engineers, to join long-term greenfield projects with a leading financial institution in London.

You will be part of small, high-calibre engineering teams delivering strategic rebuilds and modernisation projects, replacing legacy systems with clean, cloud-aligned solutions built on Java and modern engineering practices. These are not maintenance roles - they are about writing great code, solving challenging problems, and shaping architecture from the ground up.

You will be joining teams working on genuinely greenfield, strategic rebuilds with clear scope, autonomy, and modern tech stacks. There is little to no BAU work, and plenty of room to shape architecture, influence direction, and own your contributions end-to-end.

This is a great opportunity to deepen your Java expertise, work alongside highly capable engineers, and gain exposure to large-scale systems and distributed architectures within major financial organisations with no prior banking experience required.

This is a collaborative, trust-based environment where developers have real autonomy, clear ownership, and meaningful technical input. There is a genuinely friendly culture in the team - people take pride in their craft and support each other to deliver excellent software.

Creating a (non AI-based) software rewrite platform. The platform will be based on OpenRewrite. The first project to rewrite will be Talend data transformation job to move the implementation away from Talend.

Requirements for the candidate

Must Have Skillset

• Very good command of Java + Spring Framework
• Knowledge and experience with OpenID Connect
• Experience with databases (esp. PostgreSQL)
• Good understanding of Kubernetes environments

Would be plus

• Virtualization / containerization / cloud technologies
• Experience with CI/CD pipelines (e.g., Jenkins / Tekton / TeamCity / Harness / uDeploy)
• Knowledge of scripting languages (e.g., Python / Bash etc.)