Generative AI Engineer: Modernize Legacy Systems with AI

RedRock Resourcing; Reading; On-site; GBP 80,000 - 120,000; Full time

Job summary

RedRock Resourcing seeks a software engineer at the intersection of AI, architecture, and legacy modernisation. You’ll shape systems, standards, and guardrails to help engineers deliver better software safely.

Hands-on work with legacy technology and modern AI tooling to tackle technical debt, build the engineering harness, and establish automated testing and evals. Strong C#/.NET background preferred.

Qualifications

• Strong software engineering foundation and problem-solving skills.
• Experience with large, complex or legacy systems.
• Familiarity with AI tooling and modern development practices.

Responsibilities

• Use AI coding agents to investigate, refactor and modernise legacy codebases
• Design the 'engineering harness' that gives AI agents the right context, rules and constraints
• Build repository-level instructions, agent skills, prompts and dynamic context
• Work with technologies such as Claude Code, MCP and other agentic development tools
• Establish automated testing and AI evaluation frameworks to ensure quality
• Build guardrails, sandboxes and CI/CD controls around AI-driven development

Skills

Strong software engineering foundation

C#/.NET experience

Experience with legacy systems

AI tooling familiarity

Agentic development

Tools

Claude Code

GitHub Copilot

Codex

MCP

Job description

RedRock Resourcing seeks a software engineer at the intersection of AI, architecture, and legacy modernisation. You’ll shape systems, standards, and guardrails to help engineers deliver better software safely.

Hands-on work with legacy technology and modern AI tooling to tackle technical debt, build the engineering harness, and establish automated testing and evals. Strong C#/.NET background preferred.