Senior Front End Engineer (React) - GraphQL on Neptune

Senior Front End Developer (React, GraphQL, Amazon Neptune)

Fully Remote (UK-based)
Initial 3-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-enabled workflows.

This is a senior Front End role focused on developing high-performance interfaces that interact directly with a semantic knowledge graph platform.

Key Responsibilities

• Build and maintain complex React/Next.js applications in a modern TypeScript codebase
• Develop rich UI experiences powered by GraphQL APIs connected to Amazon Neptune
• Create advanced Search & Discovery interfaces, combining keyword and AI/vector-based retrieval
• Build dashboards supporting human-in-the-loop validation of AI-generated outputs
• Ensure strict adherence to WCAG 2.2 AA accessibility and design system standards
• Collaborate closely with Back End engineers, data teams, and UX/service designers
• Integrate Front End applications with AWS-hosted services (Lambda, API Gateway, ECS)

Core Skills Required

• Strong Front End engineering experience with React or Next.js + TypeScript
• Proven expertise consuming and delivering applications built on GraphQL APIs
• Hands-on experience working with GraphQL backed by Amazon Neptune is essential
• Strong state management skills (Redux, TanStack Query, or similar)
• Deep practical accessibility experience (WCAG standards)
• UK-based and able to meet security and governance requirements

Desirable Experience

• Knowledge graph or semantic data awareness (RDF, JSON-LD, linked data concepts)
• Experience building high-performance search UIs (OpenSearch, Elastic, vector search)
• Familiarity with CI/CD pipelines and Infrastructure-as-Code (Terraform/CDK)
• Interest in AI-enabled workflows and validation tooling

Please note: GraphQL experience specifically with Amazon Neptune is an absolute minimum requirement. Applications without this will not be considered.