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CBSbutler Holdings Limited trading as CBSbutler

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Senior Developer

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Summary

Senior backend developer (contract, up to £525/day inside IR35) building an Enterprise AI Gateway and AI enablement platform for a major UK government AI programme. Day to day: production backend services and REST APIs, LLM integrations via AWS Bedrock, CI/CD, and secure cloud infrastructure on AWS.

Salary: £? - ? per year

Requirements:
  • Strong backend development experience using Python, TypeScript/Node.js, Java, or Go
  • Practical experience integrating Generative AI or LLM APIs into applications or engineering workflows
  • Understanding of LLM application patterns, prompt engineering, context management, and agentic workflows
  • Experience with REST APIs, API gateways, and distributed systems
  • Strong AWS or comparable public-cloud engineering experience
  • Experience with CI/CD, infrastructure automation, and automated testing
  • Knowledge of secure API integrations, authentication, and authorisation
  • Active SC Security Clearance
Responsibilities:
  • Design, develop, and maintain production-quality backend services and APIs
  • Build integrations with AWS Bedrock, AI gateways, enterprise identity, and engineering tools
  • Develop software solutions using Generative AI and LLM APIs
  • Implement AI application patterns, including prompt management, structured outputs, tool calling, and agentic workflows
  • Develop REST APIs, gateways, and distributed services
  • Build and deploy cloud-based solutions, ideally using AWS
  • Implement CI/CD pipelines, infrastructure automation, and automated testing
  • Ensure secure integrations through authentication, authorisation, and secrets management
  • Develop observable, scalable, and maintainable services using logging, metrics, and distributed tracing
Technologies:
  • AI
  • API
  • AWS
  • Backend
  • CI/CD
  • Cloud
  • Java
  • LLM
  • Python
  • REST
  • Security
  • TypeScript
  • NodeJS

More:

We are seeking a Senior Developer to join a major government AI programme supporting the development of an enterprise AI enablement platform. The role will initially focus on building an Enterprise AI Gateway that integrates AI models, developer tooling, and enterprise security controls. This is a remote role, offering up to £525 per day inside IR35. We offer the opportunity to contribute to a significant government AI transformation programme.

last updated 45 week of 2026

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