Fullstack AI Developer (Java/Python) - Investment Bank

London-based | 5 days onsite
12-month contract + likely extension
£600–£800 per day (PAYE)

Join a high-profile greenfield initiative within a globally recognised financial institution, building next-generation research and data platforms powered by cloud-native engineering and AI.
This is an opportunity to work on a cutting-edge programme delivering scalable, AI-driven solutions across modern AWS infrastructure, React front ends, and advanced LLM/RAG workflows.

What you’ll be doing

• Building and enhancing cloud-native applications using Java and/or Python
• Developing modern React front-end solutions
• Designing scalable systems on AWS
• Delivering AI-powered features using LLMs, semantic search, and RAG architectures
• Driving engineering best practices across CI/CD, DevOps, testing, and system reliability
• Collaborating with senior engineering and product stakeholders on a flagship transformation programme

What we’re looking for

• 8+ years’ software engineering experience
• Strong hands-on experience with Java and/or Python
• Proven expertise with AWS cloud technologies
• Full stack engineering capability, ideally including React
• Experience building secure, production-grade distributed systems
• Strong understanding of modern SDLC, CI/CD, and cloud-native development
• Exposure to AI/ML solutions, particularly LLMs, OpenAI/Claude, or RAG frameworks, is highly desirable
• Background in banking, fintech, or asset management preferred