Senior Software Engineer

RedRock Resourcing; Reading; Sur place; GBP 70 000 - 110 000; Plein temps

Résumé du poste

RedRock Resourcing is seeking a senior software professional to help modernise complex legacy systems using AI-enabled tooling. You will shape the engineering harness, provide AI context and constraints, and work across AI agents and traditional development practices to deliver safer, scalable solutions.

You will collaborate with teams on modernisation strategy, cloud-adjacent improvements and robust testing, while maintaining high quality and performance in complex environments.

Qualifications

• Must have a strong software engineering foundation.
• Experience with large, complex or legacy systems.
• Familiarity with AI-assisted software engineering and AI tooling.

Responsabilités

• Hands-on with complex legacy technology, using AI tooling to tackle technical debt.
• Design the engineering harness to give AI agents the right context, rules and constraints.
• Build repository-level instructions, agent skills, prompts and dynamic context.
• Work with AI-driven development tools such as Claude Code, MCP and related agents.
• Establish automated testing and AI evaluation frameworks to balance speed and quality.
• Create guardrails, sandboxes and CI/CD controls around AI-driven development.

Connaissances

Software engineering foundation

C#/.NET

AI tooling experience

Legacy systems

CI/CD

Outils

Claude Code

Cursor

GitHub Copilot

Codex

MCP

Description du poste

Using AI and agentic engineering to modernise complex legacy software, and fundamentally change how engineering teams build software.

This isn't a traditional software engineering role. You won't simply be picking up tickets, writing code and moving onto the next sprint. You'll be working at the intersection of software engineering, architecture, AI, developer experience and legacy modernisation, helping to design the systems, standards and guardrails that allow engineers to deliver better software safely.

What will you actually be doing?

You’ll be hands-on with some seriously complex legacy technology, using modern AI tooling and engineering practices to tackle technical debt that has often been difficult to address through traditional approaches.

• 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 to work effectively
• 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 (evals) to make sure speed doesn't come at the expense of quality
• Build guardrails, sandboxes and CI/CD controls around AI-driven development

What background are we looking for?

We're looking for someone who has built a seriously strong software engineering foundation.

You’ll ideally have deep experience in C#/.NET, alongside experience working with large, complex or legacy systems.

You might have worked with:

We're particularly interested if you've also been working with:

• Claude Code, Cursor, GitHub Copilot, Codex or similar coding agents
• Agentic development or AI-assisted software engineering
• Automated testing, evals and quality frameworks
• Legacy modernisation, major refactoring or framework migrations

You’ll be joining during a major transformation across Technology, with significant investment in:

• Public cloud migration
• AI-enabled software engineering