Senior Developer

CBSbutler; City Of London; Remote; GBP 84,000 - 110,000; Full time

Job summary

CBSbutler Holdings Limited trading as CBSbutler is seeking a Senior Developer to support a major government AI programme and enterprise AI gateway development. The role emphasizes backend and cloud engineering, generative AI, LLMs, and secure, observable services. Remote work is available with a daily rate up to 525 GBP inside IR35.

The position focuses on integrating AI models, tooling and security controls, with emphasis on REST APIs, CI/CD and AWS-based deployments.

Qualifications

• Strong backend experience with Python, TS/Node.js, Java or Go.
• Practical experience integrating Generative AI or LLM APIs.
• Understanding of LLM application patterns and prompt engineering.
• Experience with REST APIs, API gateways and distributed systems.
• Strong AWS or comparable public-cloud engineering experience.
• Experience with CI/CD and automated testing.
• Knowledge of secure API integrations and authentication.

Responsibilities

• Design, develop and maintain production-quality backend services and APIs.
• Build integrations with AWS Bedrock, AI Gateways, enterprise tooling.
• Develop software solutions using Generative AI and LLM APIs.
• Implement AI application patterns, including prompt management 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 and secrets management.
• Develop observable, scalable and maintainable services with logging and tracing.

Skills

Python

TypeScript/Node.js

Java

Go

REST APIs

AWS

CI/CD

Security auth

LLM integration

Prompt engineering

Distributed systems

Observability

Tools

AWS Bedrock

Job description

Senior Developer - AI Enablement Platform

Remote

Up to 525 per day inside ir35

Active SC clearance

We are seeking an experienced 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, integrating AI models, developer tooling and enterprise security controls. You will combine strong backend and cloud engineering expertise with hands‑on experience of Generative AI and Large Language Models (LLMs).

Key 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.

Essential Skills & Experience

• 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.

Requirements

• Active SC Security Clearance is essential.

• Ability to work remotely.

This is an excellent opportunity for a Senior Developer with a strong software engineering background and practical Generative AI experience to contribute to a significant government AI transformation programme.