Avanti Recruitment is working with a long-established and award-winning UK FinTech firm based in Surrey. They have commodity trading platforms and are now looking to hire a mid-level Java Developer to join their small, collaborative software team.

This is a hands-on role with a strong focus on maintaining and improving a long-standing Java system, while also contributing to the company's journey towards a modern, microservices-based architecture. The successful candidate will spend approximately 70-80% of their time working on legacy systems (Java 8) and the remainder on newer microservices projects (Java 17/21). The company values real-world problem-solvers who are comfortable getting stuck into older codebases and keeping business-critical systems running smoothly.

What You'll Be Doing:

* Enhancing and supporting legacy Java applications

* Participating in the gradual migration to microservices using Spring Boot and AWS

* Taking ownership of tasks across the full SDLC — from development and integration to bug fixing and support

* Working closely with internal stakeholders including trading teams, product owners, and the Head of IT

* Handling occasional production support issues, context switching between projects and urgent tasks

What they're looking for:

* 3-5 years of Java development experience

* Previous experience working on legacy or monolithic systems

* Strong Java fundamentals and understanding of OOP

* Familiarity with Spring / Spring Boot and REST APIs

* Experience working with SQL databases (MySQL / PostgreSQL)

* Comfortable working in small teams and wearing many hats

* Proactive, self-sufficient, and able to work with minimal supervision

Desirable (Not Essential):

* Exposure to AWS (Aurora, Lambdas, EC2)

* CI/CD (Jenkins or GitHub Actions)

* Containerisation (Docker)

* Front-end knowledge (React or similar)

* Prior experience in finance or high-availability transactional systems

Benefits:

* Salary up to £70,000

* 27 days holiday + bank holidays

* Private medical cover (post-probation)

* Life insurance and pension

* Hybrid working: 3 days in the office (Mon/Tue/Thu), 2 days remote

* Free parking near the office

This role is not greenfield or bleeding-edge. The team are honest and transparent: there's a lot of legacy work, but it's stable and business-critical. If you enjoy solving tough problems in real systems, working in tight-knit teams, and gradually modernising infrastructure the right way, then this role could suit you.

If you are interested in applying then click Apply Now