Senior .NET / C++ Software Engineer

Senior .NET Software Engineer – Hybrid 4 days WFH - £95,000

We’re working with a highly respected SaaS and enterprise technology business looking for a Senior .NET / C++ Software Engineer to join a team responsible for software relied upon by some of the UK’s largest organisations.

This is a rare opportunity to work on a mission-critical platform operating within a highly regulated domain, where stability, performance, and engineering quality genuinely matter.

You’ll play a key role in maintaining and evolving a large-scale product used across the UK corporate tax landscape, while also contributing towards the long-term migration to a modern cloud-native platform.

What You’ll Be Doing:

Deliver regulatory and customer-driven enhancements across a complex enterprise platform

Work across C#, C++, SQL Server, and Windows-based technologies within a mature codebase

Own and improve critical filing and integration workflows

Diagnose and resolve complex performance and production issues

Contribute to modernisation and cloud migration initiatives

Improve code quality, testing, and maintainability through incremental engineering practices

Support release, deployment, and operational processes for production-critical software

Mentor junior engineers and contribute to technical best practices

Tech Environment:

C# / .NET Framework / .NET 8+

C++

SQL Server / T-SQL

WinForms / WPF

Azure DevOps

XML / XSD / iXBRL

CI/CD & automated testing

AI-assisted development tooling including GitHub Copilot, Cursor, and Claude Code

What We’re Looking For:

Strong commercial experience with both C# and C++

Experience working within large, long-lived enterprise or regulated systems

Deep understanding of SQL Server performance tuning and troubleshooting

Experience supporting or evolving on-premise / desktop-based software environments

Pragmatic engineering mindset with a focus on stability, maintainability, and quality

Interest in modernisation, cloud migration, and AI-assisted development workflows

Strong communication and collaborative problem-solving skills

What’s On Offer:

Hybrid working model

Opportunity to work on genuinely business-critical software

Exposure to modern cloud and AI engineering initiatives

Collaborative engineering culture with strong technical ownership

Long-term modernisation and transformation projects

Stable, growing technology business with significant investment in engineering

If you enjoy solving complex engineering problems, improving mature systems, and building software that organisations truly depend on, we’d love to hear from you.

Senior .NET / C++ Software Engineer – Hybrid 4 days WFH - £95,000