Senior Java Full Stack Developer
Location: London (Hybrid - minimum 3 days onsite)
Contract: 6 months
Rate: Market rate (Inside IR35) The Role
We are looking for a Senior Java Full Stack Developer to support the design, development, and maintenance of complex applications within a global engineering environment. This role combines hands-on development (75%) with Level 3 production support (25%), requiring strong technical expertise and problem-solving capability.
Key Responsibilities Design, develop, and maintain scalable Java and Python-based applications Build and enhance microservices and REST APIs for distributed systems Collaborate with product, UX, and engineering teams to deliver high-quality solutions Contribute across the full software development lifecycle (design to deployment) Implement automated testing to ensure performance, scalability, and security Diagnose and resolve production issues, performing root cause analysis Provide Level 3 support and implement long-term fixes and preventative measures Conduct code reviews and ensure adherence to engineering standards Lead technical delivery and mentor junior developers Support AI-driven initiatives using modern frameworks and tools Required Skills & Experience 10+ years of backend software engineering experience Strong expertise in Java and Python Experience building distributed, data-intensive systems Microservices architecture and REST API development Strong knowledge of SQL databases (Oracle, SQL Server, PostgreSQL) CI/CD tools and DevOps practices (Jenkins, GitLab) Containerisation and orchestration (Docker, Kubernetes) Strong understanding of software design, algorithms, and data structures JVM performance tuning and optimisation Experience providing Level 3 production support Exposure to AI/LLMs and modern AI frameworks (e.g., LangChain) Desirable Skills Experience mentoring or leading development teams Background in financial services or market data environments Familiarity with Spring Boot, Kafka, Redis, caching technologies Experience with BDD frameworks (e.g., Cucumber, Karate) Agile delivery experience or Scrum leadership exposure
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