Java Backend Engineer for FinTech Trade Platform

Square One Resources; Greater London; On-site; GBP 38,000 - 63,000; Full time

Job summary

Square One Resources is seeking a highly technical Java Web Developer to join a team in London. The role focuses on complex backend systems, high‑performance fintech platforms and evolving web applications.

You will design and implement Java services, work with Spring Boot, REST APIs, React integrations and maintain robust, scalable software. Responsibilities include debugging, performance tuning, Agile collaboration and delivering features in a fast-paced environment.

Qualifications

• Java is the core, with Spring-based backend development.
• REST API design, implementation and consumption.
• Experience with React for frontend integration is expected.
• SQL and relational databases experience (PostgreSQL).
• Git version control and Maven/Gradle build tools.
• Familiarity with Agile development practices and Linux environments.

Responsibilities

• Design, develop and implement robust Java backend services and web applications.
• Write clean, well-tested code following engineering standards.
• Participate in technical design with senior engineers and architects.
• Collaborate with frontend developers to integrate backend services.
• Investigate issues, debug and optimize performance.
• Break down user stories into technical tasks and deliver on time.
• Maintain existing systems and evolve platform capabilities.
• Promote strong team culture and cross-functional collaboration.
• Communicate technical concepts to diverse stakeholders.
• Stay current with Java, Spring, and software engineering best practices.

Skills

Java development

Spring Framework

Spring Boot 3.x

REST APIs

React

SQL

Git

Maven/Gradle

Agile development

Linux/Unix

Education

BS/MS in Computer Science or related

Tools

Docker

CI/CD

PostgreSQL

Job description

Square One Resources is seeking a highly technical Java Web Developer to join a team in London. The role focuses on complex backend systems, high‑performance fintech platforms and evolving web applications.

You will design and implement Java services, work with Spring Boot, REST APIs, React integrations and maintain robust, scalable software. Responsibilities include debugging, performance tuning, Agile collaboration and delivering features in a fast-paced environment.