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