Senior C# Developer

Location: London (Fully Onsite)
Employment Type: Permanent
Salary: 50,000 - 60,000 (DOE)
Visa Sponsorship: Not available

We’re working with a London-based organisation that is looking to hire an experienced Senior C# Developer to join their engineering team in a fully onsite position. This role is ideal for someone who enjoys hands-on development, working closely with the business, and taking ownership of complex systems.

The Role

As a Senior C# Developer, you’ll be responsible for designing, developing, and maintaining business-critical applications built on C#/.NET and SQL. You’ll play a key role in technical decision-making, improving code quality, and ensuring the reliability and performance of core systems.

You’ll work closely with other developers, QA, product owners, and non-technical stakeholders, contributing across the full software development lifecycle.

Key Responsibilities

• Design, develop, and maintain applications using C# / .NET
• Write, optimise, and maintain SQL queries, stored procedures, and database schemas
• Contribute to technical architecture and system design discussions
• Carry out code reviews and promote best development practices
• Support and mentor junior and mid-level developers
• Troubleshoot, debug, and improve existing systems
• Collaborate closely with business and technical teams onsite

Essential Skills & Experience

• Strong commercial experience as a Senior C# Developer
• Advanced knowledge of C# / .NET
• Strong experience working with SQL (SQL Server or similar)
• Experience delivering and supporting production-grade applications
• Solid understanding of software design principles and best practices
• Comfortable working in a onsite London-based team
• Strong communication and stakeholder engagement skills

Desirable Skills

• Experience with modern .NET versions
• Exposure to cloud platforms (Azure, AWS, or similar)
• Experience with RESTful APIs
• Familiarity with Agile / Scrum environments

What’s On Offer

• Salary of 50,000 - 80,000 depending on experience
• onsite role in London
• Opportunity to work on business-critical systems
• Collaborative, experienced engineering team
• Long-term stability and career progression

Apply Now

If you’re a Senior C# Developer looking for an onsite role in London where you can have real technical ownership and work on complex systems, we’d love to hear from you.