Senior Backend TypeScript/Node Engineer (LLM/RAG Integrations) - Permanent and FTC available

Senior Backend JavaScript Engineer

Salary: Up to £76,000 per annum for Permanent AND Fixed-Term Contract available - Hybrid working from West London

About the role:

You’ll be working on a modern digital publishing and content platform to design and build scalable APIs and AI-powered text, audio, and video content services that integrate internal systems with third-party platforms.

Reporting to the Lead UI Developer, the Senior JavaScript Engineer will be expected to develop, maintain, and support digital products in accordance with business and technology objectives.

Responsibilities:

• Immerse yourself in the technical ecosystem
• Develop and test new features, and support existing ones
• Build reusable code, packages, and libraries for future use
• Optimise code for maximum speed and scalability against agreed performance budgets
• Use testing frameworks to ensure automated test coverage for platform functionality
• Collaborate with other team members including Delivery Managers and Product Owners to help plan new functionality or major enhancements
• Write and improve technical documentation where necessary

Requirements:

• Developing JavaScript APIs and services using Node.js and TypeScript
• Working with Node.js/TypeScript within large-scale projects
• Experience with distributed systems, scalability, and cloud architecture (preferably AWS)
• Building and working with mixed data formats (structured and unstructured) and storage solutions (e.g. blob storage, MySQL, document storage)
• Building and integrating RAG pipelines
• Building and maintaining multi-step workflows and AI-orchestrated processes
• Understanding LLM integration patterns
• Implementing AI solutions using AWS or equivalent technologies, including:
• Model access and orchestration (e.g. Amazon Bedrock)
• Vector and semantic search (e.g. Amazon OpenSearch)

Benefits:

• Relaxed working environment with regular socials
• Well-being initiatives and mental health support
• 25 days holiday plus birthday leave
• Additional office closure between Christmas and New Year
• Tailored training and development opportunities
• Progressive and transparent culture with clear career progression
• Flexible / hybrid working and early finish Fridays
• Cycle to work scheme
• Enhanced family policies including paternity, adoption, and surrogacy leave
• Competitive pension and life assurance
• Modern office environment with collaborative spaces