
Client Server
Lead C# Developer .Net - FinTech
Job Description
Salary: £100,000 - 100,000 per year
Requirements:- Expertise with C# .NET Core backend software development on large, scalable systems with complexity
- Strong technical leadership experience, taking ownership of features rather than managing people
- Collaborative and pragmatic approach, with the ability to push back and influence senior engineers
- Strong knowledge of clean, reusable, and maintainable code and modern Microsoft software engineering best practices
- Good knowledge of event-driven architecture
- Thorough understanding of computer science fundamentals, including OOP, data structures, design patterns, and algorithms
- Good understanding of CI/CD and Infrastructure as Code (IaC)
- Appreciation of Azure, SaaS, PaaS, and microservices
- Degree educated in a relevant STEM discipline, such as Computer Science, with a good grasp of mathematics
- Manage three Agile teams of around ten experienced software engineers
- Work on our flagship desktop insurance platform that handles 4 billion requests per month
- Architect, design, and develop new features and enhancements
- Ensure high levels of security, reliability, maintainability, usability, and performance
- Collaborate with the Product Owner and other development teams on design and technical choices
- Provide technical ownership in an Agile environment that encourages close collaboration and continual improvement
- Architect
- Azure
- Backend
- C#
- CI/CD
- OOP
- PaaS
- Product Owner
- Security
- microservices
- ASP.NET
- Cloud
More:
We are a global Fintech offering a senior, hands-on leadership role on complex and technically challenging systems with continual learning opportunities. We offer a competitive salary of up to £100k plus bonus, hybrid working with three days from home and two days in our Reigate office, 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 other perks.
last updated 34 week of 2026
Interested in this role?
Submit your application now
How to Apply
About Client Server

Client Server
Sidlow
IT
Skills & Technologies
Inferred from job description
Salary Insight
£100,000
This role
£85,000
UK median
This salary is 18% above the UK median for Lead roles (£85,000/yr).
Based on 2024–2025 UK technology sector benchmarks