Java Back End Developer, London

Role: Backend Developer (Core Java)

We are seeking an experienced Backend Developer with strong expertise in Core Java to build scalable, high-performance APIs and work effectively within large, complex codebases. The ideal candidate will have a solid foundation in system architecture and will collaborate closely with DevOps and the Head of Engineering in a small, agile team.

This role plays a critical part in developing and enhancing a microservices-based platform that supports risk management and backend operations for both corporate and retail trading. You will also contribute to shaping the technical roadmap and improving the Software Development Life Cycle (SDLC).

Key Responsibilities:

• Design, develop, and maintain high-performance backend services for complex data processing systems
• Architect scalable solutions for high-volume calculations and data pipelines
• Optimize database schemas, write efficient SQL queries, and improve database performance
• Collaborate directly with business stakeholders to define and deliver new features
• Ensure performance, reliability, and quality across all backend services
• Identify and resolve performance bottlenecks, defects, and system issues
• Adhere to best practices in engineering, including design patterns and architectural principles
• Develop and maintain unit and integration testing frameworks
• Contribute to the technical roadmap and continuously improve SDLC processes
• Support additional ad hoc technical tasks as required

Technical Skills:

• 5+ years of experience in software engineering with strong Core Java expertise
• At least 2 years of experience working with SQL databases
• Strong experience in API development and automation
• Familiarity with cloud platforms such as AWS, Azure, or GCP
• Experience working in Agile environments
• Hands-on experience with CI/CD pipelines and version control systems
• Experience with Python is a plus

Qualifications & Experience:

• Bachelor’s or Master’s degree in Computer Science, Data Science, Information Technology, Electrical Engineering, or a related field (must have)
• Experience in a regulated industry, preferably within banking or financial services
• Proactive mindset with a strong sense of ownership and a focus on continuous improvement