Lead C# Full Stack Engineer (197637)

Harnham; Greater London; On-site; GBP 70,000 - 110,000; Full time

Benefits offered by this job

Ownership

Technical direction

Autonomy

Job summary

Harnham is seeking a senior engineer to take ownership of complex systems and help steer the direction of a growing engineering function. You will work on high-impact projects with real-time performance challenges and contribute to shaping technical direction.

In this UK-based role, you will lead C# and .NET development across platforms, own key components of large-scale systems, and design scalable, high-performance solutions.

Qualifications

• Proven senior C# and .NET development experience.
• Track record building and optimizing high-performance systems.
• Experience with full stack development and modern engineering practices.
• Strong understanding of system architecture and design.
• Ability to lead technically and influence engineering decisions.

Responsibilities

• Lead the development of C# and .NET applications across platforms.
• Own key components of large-scale systems and drive technical excellence.
• Design and implement scalable and high-performance solutions.
• Collaborate with other teams to deliver impactful projects.
• Mentor engineers and contribute to team growth and best practices.

Skills

C#/.NET

High-performance systems

Full stack development

System architecture

Technical leadership

Job description

This is an opportunity for a senior engineer to take ownership of complex systems and contribute to the direction of a growing engineering function. You will work on high-impact projects with real-time performance challenges.

The Company

They are an established, technology-led organisation with a strong focus on high-performance systems and data-driven decision making. The engineering team is central to the business, working on a diverse range of projects with significant technical depth. The culture is collaborative, with a strong emphasis on autonomy and ownership.

The Role

• Lead the development of C# and .NET applications across multiple platforms
• Own key components of large-scale systems and drive technical excellence
• Design and implement scalable and high-performance solutions
• Collaborate closely with other teams to deliver impactful projects
• Mentor engineers and contribute to team growth and best practices

Your Skills & Experience

• Strong expertise in C# and .NET development
• Proven experience building and optimising high-performance systems
• Experience with full stack development and modern engineering practices
• Strong understanding of system architecture and design
• Ability to lead technically and influence engineering decisions

What They Offer

• High level of ownership and autonomy
• Opportunities to shape technical direction
• A strong engineering culture focused on quality and innovation