Senior C# Developer - Londin - Perm

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.

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.

• 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

• 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

• Experience with modern .NET versions

• Exposure to cloud platforms (Azure, AWS, or similar)

• Experience with RESTful APIs

• Familiarity with Agile / Scrum environments

• 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

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.