Senior Backend Developer - GraphQL on Neptune

Senior Backend Developer (AWS, GraphQL, Knowledge Graph)

Remote (UK-based)

Initial 4-month contract

Up to £450 per day (Negotiable)

We're working with a major UK organisation building a next-generation knowledge platform that combines structured data, graph technology, and AI-driven workflows.

This is a senior Back End role focused on developing scalable APIs and data services that sit at the heart of a semantic, graph-based platform.

Key Responsibilities

• Build and maintain robust GraphQL and REST APIs, including feedback and validation services
• Develop Back End services using AWS serverless infrastructure (Lambda, API Gateway, EventBridge)
• Work with Amazon Neptune to manage complex knowledge graph relationships (SPARQL/Gremlin)
• Support hybrid search and retrieval using OpenSearch and vector-based approaches
• Integrate AI/LLM workflows into production-ready Back End systems

Core Skills Required

• Strong Back End engineering experience (Python or Node.js/TypeScript)
• Proven expertise with GraphQL in production environments
• Hands-on experience with Amazon Neptune/graph databases
• Deep AWS serverless knowledge
• UK-based and able to meet security and governance requirements

Desirable

• Experience with AI platform integration (eg Bedrock, LangChain, RAG)
• Infrastructure-as-Code (Terraform/CDK)

GraphQL on Amazon Neptune is an absolute minimum requirement so please do not apply without this.