C# Full Stack Engineer (197637)

Harnham; Greater London; On-site; GBP 60,000 - 90,000; Full time

Benefits offered by this job

Ownership of key projects

Clear progression into senior roles

Collaborative engineering team

Job summary

Harnham is seeking an experienced .NET developer to design, build and optimise C# applications across multiple systems. You will work on greenfield projects and enhance existing platforms, contributing to system design and performance improvements.

You will collaborate with cross-functional teams to deliver robust technical solutions and mentor junior engineers, supporting a culture of continuous learning and technical excellence.

Qualifications

• Strong commercial experience with C# and .NET.
• Experience building scalable and maintainable systems.
• Exposure to full stack development, including frontend frameworks.
• Understanding of performance optimisation and system design principles.
• A continuous learning mindset with the ability to apply new concepts.

Responsibilities

• Develop and enhance C# .NET applications across multiple systems.
• Work on greenfield projects and improvements to existing platforms.
• Contribute to system design and performance optimisation.
• Collaborate with cross-functional teams to deliver technical solutions.
• Support and mentor more junior engineers where appropriate.

Skills

C#

Frontend development

System design

Performance optimization

Mentoring

Job description

The Company

They are a growing, data-focused organisation with a strong reputation for engineering quality and innovation. The business operates in a fast-paced environment where technology underpins key decision-making. Their flat structure enables engineers to contribute ideas and have a tangible impact on projects.

The Role

• Develop and enhance C# .NET applications across multiple systems
• Work on both greenfield projects and improvements to existing platforms
• Contribute to system design and performance optimisation
• Collaborate with cross-functional teams to deliver technical solutions
• Support and mentor more junior engineers where appropriate

Your Skills & Experience

• Strong commercial experience working with C# and .NET
• Experience building scalable and maintainable systems
• Exposure to full stack development, including frontend frameworks
• Understanding of performance optimisation and system design principles
• A continuous learning mindset with the ability to apply new concepts

What They Offer

• Opportunity to take ownership of key projects
• Clear progression into senior positions
• Collaborative and high-performing engineering team