Software Developer C# .Net Core API SQL

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

Benefits offered by this job

Bonus

Pension

Life Assurance

Income Protection

Critical Illness Cover

Job summary

Client Server Limited is seeking a backend Software Developer/Engineer in Bracknell (WFH to £85k) to contribute to a major rebuild of a leading international payments platform. You will design and implement robust APIs and backend services using C# .Net Core, work on SQL databases, and apply strong architecture principles across microservices in a cloud environment.

You will join a small autonomous team of 4–6 engineers, mentoring peers and delivering new capabilities from design through

Qualifications

• Proven backend development experience with C# .Net Core.
• Experience designing and building production APIs.
• Strong SQL database design and query optimization.
• Experience with microservices and event-driven architectures.
• Familiarity with AWS or other cloud platforms.
• Mentoring and sharing technical knowledge with peers.
• Hands-on experience using AI coding tools such as Claude or Copilot.

Responsibilities

• Lead delivery of new backend features from design to production.
• Design robust, scalable APIs and backend services.
• Mentor engineers and promote technical best practices across the team.
• Collaborate on system design and architectural decisions.

Skills

C# .Net Core

APIs design

SQL

System design

Microservices

AWS

Mentoring

AI tools (Claude/Copilot)

Tools

Claude

GitHub Copilot

Job description

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

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

Are you a backend focussed Software Developer with strong C# skills?

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

As a Software 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