Senior Java Developer

About Phi Partners Phi Partners has been a trusted capital markets consultancy for more than 20 years, providing quantitative and technology expertise across front office, pricing and risk. We support more than 80 financial institutions across the buy-side and sell-side through niche capabilities spanning quant, engineering, vendor platforms and cloud infrastructure.

Our teams work on complex, real-world problems across models, analytics, applications, data and cloud infrastructure, within an international delivery organisation built around regional hubs and specialist centres of excellence. For people who enjoy technically demanding work in capital markets, Phi offers the opportunity to work closely with expert colleagues and major financial institutions on high-value, business-critical initiatives.

Role & Responsibilities As a Senior Java Developer, you will join a team delivering high-performance e-trading and risk platforms, designing and enhancing Java-based solutions within complex financial technology environments.

This is a hands-on engineering role focused on building scalable, maintainable software, solving technical challenges, and contributing to the evolution of existing platforms. You will design, develop, and enhance Java components, analyse and modernise existing systems, support performance improvements, and contribute to code quality through testing, reviews, and engineering best practices. Working closely with technical leads, engineers, business analysts, and stakeholders, you will help translate requirements into robust technical solutions while contributing to delivery across the full software development lifecycle.

Key Skills Necessary

• Strong hands-on Core Java development experience, with a solid understanding of language fundamentals, object oriented principles, design patterns, and the Java Collections Framework
• Experience developing applications using Spring / Spring Boot, REST APIs, and microservices
• Solid understanding of multithreading, concurrency, JVM fundamentals (Memory Management, Garbage Collection)
• Strong SQL skills and experience with varied databases
• Experience with messaging technologies (e.g., Kafka, JMS, or similar)
• Experience working across the full software development lifecycle (SDLC), including Agile delivery, source control (Git), CI/CD pipelines, and testing practices
• Strong analytical and problem-solving skills, with the ability to work independently and collaboratively
• Curiosity for emerging technologies and a keen interest in Capital Markets Technology

Nice to Have

• Knowledge of distributed systems, scalable application design, and application performance
• Exposure to reactive programming frameworks such as Spring WebFlux or Reactor
• Comfortable working in Unix/Linux environments
• Familiarity with Docker and Kubernetes
• Capital Markets experience, particularly within eTrading or Risk platforms
• Academic degree in Computer Science, Mathematics, Engineering, or a related discipline

Next Steps This is an excellent opportunity for a Senior Java Developer who thrives in fast-paced, front-office environments and wants to build technology used across global trading floors and business-critical investment banking teams. You’ll join a collaborative engineering team working on core pricing capabilities at the heart of a leading investment bank’s markets business. The role is hands-on, impact-driven, and ideal for someone who enjoys solving complex problems, collaborating with traders and quants, and contributing to platforms relied upon across London, New York, and global desks.

If interested, please send a CV to [email protected]. We’d be happy to arrange a call to discuss further.

Posted on 16th Oct 2026