Senior Java Software Engineer

Senior Java Developers x 5 – Banking

Contract: 12 months

Rate: £775 per day (Inside IR35)

Location: 3 days onsite in Canary Wharf, 2 days elsewhere in London (hybrid)

Overview

We are seeking an experienced Senior Java Developer with strong banking / financial services experience to join a high-profile programme delivering mission-critical trading and core banking systems. You will work in a fast-paced, agile environment building highly scalable and resilient backend services.

This role suits a senior engineer comfortable working in complex, regulated environments and contributing to architecture and technical direction.

Key Responsibilities

• Design, build and maintain high-performance Java microservices
• Work on low-latency, high-throughput systems in a banking environment
• Contribute to solution architecture and technical design
• Collaborate with traders, quants, product owners and DevOps teams
• Improve system performance, resilience and scalability
• Write clean, testable, maintainable code following best practices
• Support CI/CD pipelines and cloud-native deployments
• Participate in code reviews and mentor junior developers
• Ensure solutions meet security and regulatory requirements

Required Skills & Experience

• Strong Java development experience (Java 11/17+)
• Spring Boot / Spring ecosystem
• Microservices architecture
• REST APIs and distributed systems
• Multithreading and concurrency
• SQL and NoSQL databases (Oracle, PostgreSQL, MongoDB etc.)
• Messaging systems (Kafka, MQ or similar)
• CI/CD pipelines (Jenkins, GitLab CI, etc.)
• Containerisation (Docker, Kubernetes)
• Cloud exposure (AWS / Azure / GCP)

Banking / Finance Experience (Essential)

• Experience working in investment banking, trading, or capital markets
• Understanding of:
• Market data / pricing / risk / payments / trading systems
• Regulatory and security considerations
• High-availability production systems

Desirable Skills

• Low-latency / high-frequency trading systems
• Event-driven architecture
• Infrastructure as Code (Terraform)
• Observability tools (Prometheus, Grafana, ELK)
• Agile / Scrum environment experience

Soft Skills

• Strong stakeholder communication
• Ability to work in large enterprise environments
• Proactive and solution-oriented mindset
• Experience mentoring or leading developers

Working Model

• Hybrid: 3 days onsite in Canary Wharf, 2 days elsewhere in London
• Long-term programme (12-month contract with likely extensions)
• Inside IR35 engagement