Senior C# Engineer - .NET, Blazor, Kafka, API, C#

JR United Kingdom; Basingstoke; Remote; GBP 80,000 - 100,000; Full time

Job summary

A leading fintech company is seeking a Senior C# Developer for a contract role focused on transforming core banking systems. This position offers a remote-first environment with flexibility for occasional office visits in Cambridge or London. The ideal candidate will have a proven background in C#/.NET, especially within regulated financial services, and will play a key role in engineering and architectural improvements.

Qualifications

• Proven experience in C#/.NET, ideally in regulated services.
• Strong understanding of modern engineering principles to impact architecture.

Responsibilities

• Build core banking functionality using C# and .NET.
• Design and maintain secure, scalable Azure-hosted APIs.
• Support DevOps practices with CI/CD pipelines.

Skills

C#

.NET

RESTful APIs

CI/CD

Azure

Tools

Blazor

Job description

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Client:

Denu Recruit

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Other

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Yes

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Job Views:

3

Posted:

06.06.2025

Expiry Date:

21.07.2025

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Job Description:

Senior C# Developer (Contract) | Core Banking Systems | Remote (UK) | £Outside IR35

We’re working with a fast-paced fintech company looking for a Senior C# Developer to join their agile team for an initial 3-month contract (Outside IR35 - potential extension)

You’ll be playing a key role in implementing and transformation of a core banking system, building scalable services and secure APIs. If you enjoy solving complex problems and building tools that make an operational impact, this is a great opportunity to work at the heart of an innovative platform. This is a small team of engineers and as much as it is a contract there is a big focus on team focus.

• Build core banking functionality using C# and .NET
• Design and maintain secure, scalable Azure-hosted APIs
• Collaborate across engineering, product and ops to ensure a smooth, efficient platform
• Support DevOps practices with CI/CD pipelines and monitoring tools
• They have internal interface which are built using Blazor

You’ll need:

• Proven experience in C#/.NET, ideally in regulated/financial services/core banking - this is a big plus
• Comfortable building and consuming RESTful APIs
• To have strong understanding of modern eng principles to make impact on the engineering architecture and culture.

Work setup:

• Remote-first with optional visits to offices in Cambridge or London
• Flexible if you'd like occasional time onsite with the team

Start: ASAP

Location: UK-based, remote

Interested? Let’s chat — we’d love to tell you more. Or apply now with your CV.