Java Developer

Avensys Consulting UK; Belfast City District; Hybrid; GBP 90,000 - 120,000; Full time

Job summary

Avensys Consulting UK in Belfast, Hybrid, seeks a Java Architect/Lead Developer to drive backend design using Java, Spring Boot and microservices. You will shape architecture, ensure scalable, high-performance systems and lead delivery across teams.

The role emphasizes ownership of REST APIs, data access and concurrency handling in enterprise-grade applications, with financial services experience a strong plus.

Qualifications

• Strong hands-on experience with Java, Spring Boot and microservices.
• Proven ability to design scalable, enterprise-grade backend systems.
• Experience with high-volume transactions in financial services is a plus.
• Leadership of cross-functional teams including QA and business stakeholders.

Responsibilities

• Provide technical leadership and guide design decisions.
• Collaborate with architects, developers and QA to ensure performance.

Skills

Java

Spring Boot

Microservices

REST APIs

Architecture

Performance optimisation

Multithreading

Concurrency

Distributed systems

Enterprise-grade backend

Tools

SQL

Linux/Unix

Relational databases

Job description

Location: Belfast, Northern Ireland - Hybrid

Looking for a Java Architect / Lead Developer with strong hands-on experience in Java, Spring Boot, Microservices & REST APIs.

Strong understanding of application architecture, design, scalability, performance optimisation, multithreading & concurrency.

Experience designing and leading high-volume, enterprise-grade backend applications and distributed systems.

Strong SQL / relational database and Linux/Unix experience; financial services/banking experience would be highly relevant.

Work closely with architects, developers, QA and business teams, providing technical leadership and driving design decisions.