Backend Software Engineer C# .Net - FinTech

Client Server; Reigate; Hybrid; GBP 54,000 - 90,000; Full time

Benefits offered by this job

Hybrid working

Enhanced parental leave

25 days holiday + birthday off

Pension (up to 10%)

Health care and life assurance

Training and career development

Social events and other perks

Job summary

Client Server is seeking a Backend Software Engineer in Reigate to design, develop and own backend features using C# .NET Core within a scalable, secure architecture. The role blends hands-on coding with technical leadership in a fast-paced fintech environment.

You will collaborate with Product Owners and cross-functional teams, driving improvements in reliability, performance and maintainability while benefiting from hybrid work and continued learning opportunities.

Qualifications

• Proven expertise with C# .Net Core backend development on large, scalable systems.
• Strong technical leadership and ownership of features.
• Ability to influence senior engineers and collaborate across teams.
• Knowledge of modern Microsoft engineering best practices.
• Understanding of event-driven architecture.
• Solid foundations in CS fundamentals (OOP, data structures, algorithms).
• Experience with CI/CD and Infrastructure as Code.
• Familiarity with Azure, SaaS, PaaS, microservices.
• Degree in Computer Science or related STEM field.

Responsibilities

• Architect and develop new features while ensuring security, reliability, maintainability, usability and performance.
• Collaborate with Product Owner and other teams on design and technical choices.
• Provide technical ownership in an Agile environment.

Skills

C# .Net Core backend

Backend architecture

Technical leadership

Event-driven architecture

CI/CD / IaC

Azure / cloud

OOP fundamentals

Education

Degree in Computer Science or STEM

Job description

Backend Software Engineer / Developer (C# .Net Desktop Application) Reigate / WFH to £90k

Do you have expertise with C# desktop development, working on complex scalable systems?

You could be progressing your career, in a senior, hands‑on leadership role working on complex and technically challenging systems with continual learning opportunities a global Fintech.

What’s in it for you:

• Up to £90k salary plus bonus (c20%)
• Hybrid working (3 days a week work from home)
• Enhanced parental leave
• 25 days holiday (plus buy days and your birthday off)
• Pension (up to 10% contribution)
• Health Care and Life Assurance
• Training and career development
• Social events and a range of other perks

Your role:

As a Backend Software Engineer you’ll play a key role in architecting, designing and developing new features and enhancements whilst ensuring high levels of security, reliability, maintainability, usability and performance.

You’ll collaborate with the Product Owner and with other development teams to input into design and technical choices and provide technical ownership an Agile environment that encourages close collaboration and continual improvement.

Location / WFH:

There’s a flexible work from home hybrid model, you’ll join colleagues in the Reigate office twice a week for team meet‑ups and stakeholder meetings with the other three days work from home.

About you:

• You have expertise with C# .Net Core backend software development, having worked on large, scalable systems with complexity
• You have strong technical leadership experience (taking ownership of features, not managing people)
• You are collaborative and pragmatic yet able to push back and influence senior engineers
• You're an advocate of creating, clean, reusable and maintainable code and have a good knowledge of modern Microsoft software engineering best practices
• You have a good knowledge of event driven architecture
• You have a thorough understanding of Computer Science fundamentals such as OOP, Data Structures, Design Patters, Algorithms
• You have a good understanding of CI/CD and Infrastructure as Code (IaC)
• You have an appreciation of Azure, SaaS, PaaS, microservices
• You're likely to be degree educated in a relevant STEM discipline e.g. Computer Science with a good grasp of mathematics