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

JR United Kingdom; Cardiff; Remote; GBP 60,000 - 80,000; Full time

Job summary

A leading fintech company is seeking a Senior C# Developer for a remote contract role focused on core banking systems. You will join an agile team where you will implement scalable services and secure APIs, contributing significantly to an innovative product. Ideal candidates should have experience in regulated environments and enjoy tackling complex challenges.

Qualifications

• Proven experience in C#/.NET, ideally in regulated financial services/core banking.
• Comfortable building and consuming RESTful APIs.
• Strong understanding of modern engineering principles.

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

Blazor

DevOps practices

Tools

Azure

Job description

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

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Client:

Denu Recruit

Location:

cardiff, United Kingdom

Job Category:

Other

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EU work permit required:

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.