Senior C# Developer

Bright Purple; United Kingdom; Remote; GBP 50,000 - 65,000; Full time

Benefits offered by this job

Remote UK

25 days holiday

Company pension

Life assurance

MS training & certification

Job summary

Bright Purple is seeking a senior C# developer to lead technical decisions on a mature, business-critical application used by public sector clients across the UK. You will help shape the next chapter of this core product, with a strong emphasis on quality and learning.

This remote-friendly role involves modernising legacy code, delivering new features with ASP.NET Core MVC and Web APIs, mentoring juniors, reviewing code, and close collaboration with customers to translate requests into scalable

Qualifications

• 5+ years of commercial C#/.NET experience including .NET 6+
• Senior-level experience, leading technical decisions and mentoring others
• Experience with ASP.NET Core MVC and Web APIs
• SQL Server design and performance tuning
• REST APIs and third-party integrations
• Modernising legacy code (WinForms or .NET Framework ideally)
• Front-end experience with React or Angular

Responsibilities

• Take a leading technical role in evolving a mature business-critical application.
• Gradually bring older parts of the codebase up to date while delivering new functionality for customers.
• Collaborate with the team lead and developers to steer technical design and maintain code quality; perform reviews and pair programming.
• Turn customer requirements into features that benefit the wider user base.

Skills

C# / .NET

Senior developer

ASP.NET Core

SQL Server

REST APIs

WinForms / .NET Framework

React / Angular

Code reviews / pairing

Job description

Are you a seasoned C# developer looking for a senior role where your work has a real impact?

This is a chance to join a well-established software business whose products are relied on by public sector organisations across the UK. Our client has a strong track record of long-serving team members, thanks to a culture that values good engineering, ongoing learning and a healthy work/life balance. They're now growing their development team and need a senior engineer to help shape the next chapter of one of their core products.

What is in it for you:

• Salary of £50,000 - £65,000, reviewed annually
• Remote working within the UK
• 25 days’ holiday, increasing with length of service
• Company pension and life assurance
• Funded Microsoft training and certification

The Role:

• You'll take a leading technical role in evolving a mature, business-critical application.
• You'll gradually bring older parts of the codebase up to date while delivering new functionality for customers.
• Day to day, you'll work closely with your team lead and fellow developers, help steer technical design, set the bar on code quality and share your knowledge with less experienced colleagues through reviews and pairing.
• You'll also work directly with customer requirements, turning individual requests into features that benefit the wider user base.
• 5+ years' commercial C#/.NET, including .NET 6+
• Senior-level experience, leading technical decisions and mentoring others
• ASP.NET Core MVC and Web APIs
• SQL Server design and performance tuning
• REST APIs and third-party integrations
• Modernising legacy code (WinForms or .NET Framework ideally)
• React or Angular

This role suits a senior developer who enjoys owning technical problems, improving systems over time and writing software that serves a real purpose. You'll get remote flexibility, a supportive team and the chance to make a lasting mark on a product that matters.