C# Developer .Net Core

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

Benefits offered by this job

Salary to £85k + bonus

23 days holiday, rising to 28 + your生日

Pension, Life Assurance, Income Protec

Job summary

Client Server Ltd. in Bracknell, Berkshire seeks a senior backend C# Developer to lead the rebuild of a payments platform. You’ll own backend services, build robust APIs with C# .Net Core, and influence architecture across microservices and event-driven patterns.

You’ll work on SQL databases, cloud infra (AWS), and use AI coding tools like Claude or Copilot to boost productivity, with hybrid WFH and office twice weekly.

Qualifications

• 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.

Responsibilities

• Design and implement robust, scalable APIs and backend services with C# .Net Core.
• Lead new features and drive architectural decisions across microservices and event-driven systems.
• Collaborate with a small autonomous team including QA and a Team Lead.
• Mentor engineers and share technical knowledge to raise coding standards.

Skills

C# .Net Core

Backend API development

SQL databases

System design & microservices

AWS

Mentoring engineers

AI coding tools (Claude, Copilot)

Job description

Bracknell, Berkshire | £75k - £85k per year

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