Senior .NET / C++ Software Engineer

Oliver Bernard; Greater London; Hybrid; GBP 86,000 - 105,000; Full time

Job summary

Oliver Bernard is seeking a Senior .NET / C++ Software Engineer for a hybrid role (4 days WFH) with a £95,000 package. You’ll work on a mission-critical platform trusted by major UK organisations in a regulated domain.

You’ll use C#, C++, SQL Server and Windows tech, own critical workflows, and contribute to cloud migration and modernization while mentoring peers and driving quality.

Qualifications

• Strong experience with C# and C++ in enterprise or regulated systems.
• Deep knowledge of SQL Server performance tuning.
• Experience in on-premise/desktop environments and cloud migration.

Responsibilities

• 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.

Skills

C#

C++

SQL Server

WinForms / WPF

CI/CD

AI-assisted tooling

Tools

GitHub Copilot

Cursor

Claude Code

Job description

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++
• SQL Server / T-SQL
• WinForms / WPF
• 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:

• 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