C# Developer .Net Core

Client Server; Bracknell; Hybrid; GBP 75,000 - 85,000; Full time

Benefits offered by this job

23 days holiday

Pension

Life Assurance

Income Protection

Critical Illness Cover

Job summary

Client Server is seeking a backend-focused C# Developer to help rebuild a major international payments platform from Bracknell with hybrid work. You’ll design and implement robust APIs and backend services using C# .NET Core, lead features end-to-end, and own critical technical projects.

You will optimise SQL databases, work on microservices and event-driven architectures, and mentor other engineers while using AI coding tools such as Claude or Copilot to boost productivity.

Qualifications

• Strong C# .NET Core backend development experience.
• Experience building production APIs.
• Good SQL skills.
• Experience with system design, software architecture, microservices and event-driven systems.
• Comfortable with cloud infrastructure in production; AWS preferred.
• Experience mentoring engineers and sharing technical knowledge.
• Hands-on experience using AI coding tools such as Claude or Copilot.

Responsibilities

• Design and implement robust APIs and backend services using C# .NET Core.
• Lead new features and technical projects from design through to production.
• Contribute to evolution of the architecture and system design across services.
• Mentor colleagues and promote engineering best practices.

Skills

C# .Net Core

APIs

SQL

System design

Microservices

Event-driven

AWS

Mentoring

AI tools Claude Copilot

Payments experience

Job description

C# Developer / Backend Software Engineer (C# .Net API SQL) Bracknell / WFH to £85k

Are you a backend focussed C# Developer?

You could be progressing your career in a senior, hands-on C# Developer role, working on a major rebuild of a leading international payments platform.

As a C# Developer you'll join a small, autonomous engineering team of around 4-6, including QA and a Team Lead, helping to modernise backend services and build the next generation of the platform. This is a hands-on role with genuine technical ownership, where you'll lead the delivery of new capabilities and contribute to the evolution of the underlying architecture.

You'll design and implement robust, scalable APIs and backend services using C# .Net Core, leading new features and technical projects from design through to production, applying strong system design and architectural principles across microservices and event driven environments.

You'll design and optimise SQL databases and queries, maintain high standards of automated testing and work with AWS and other cloud platforms in production. You'll also use AI development tools such as Claude and GitHub Copilot to improve engineering productivity, while mentoring other engineers and contributing to technical best practice.

Location / WFH:

You can work from home most of the time, joining colleagues in the Bracknell office twice a week.

About you:

• You have strong C# .Net Core backend development experience
• You have experience building production APIs
• You have good SQL skills
• You have experience with system design, software architecture, microservices and event driven systems
• You're comfortable working with cloud infrastructure in production; AWS preferred
• You have experience mentoring engineers and sharing technical knowledge
• You have hands-on experience using AI coding / development tools such as Claude or Copilot
• Finance / payments experience is desirable, but not essential

What's in it for you:

• Salary to £85k + bonus
• 23 days holiday, rising to 28 + your birthday off
• Pension, Life Assurance, Income Protection, Critical Illness Cover