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

JR United Kingdom; Southampton; Remote; GBP 55,000 - 75,000; Full time

Job summary

A leading fintech company is seeking a Senior C# Developer to join their agile team for a 3-month contract. This remote role offers a fantastic opportunity to transform core banking systems, focusing on building scalable services and secure APIs, with flexibility for occasional office visits in Cambridge or London.

Qualifications

• Proven experience in C#/.NET in regulated or financial services is a big plus.
• Strong understanding of modern engineering principles is essential.

Responsibilities

• Build core banking functionality using C# and .NET.
• Design and maintain secure, scalable Azure-hosted APIs.
• Collaborate across engineering, product, and ops for smooth platform efficiency.

Skills

C#

.NET

RESTful APIs

DevOps

Blazor

Tools

Azure

Job description

Social network you want to login/join with:

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

col-narrow-left

Client:

Denu Recruit

Location:

southampton, United Kingdom

Job Category:

Other

-

EU work permit required:

Yes

col-narrow-right

Job Views:

3

Posted:

06.06.2025

Expiry Date:

21.07.2025

col-wide

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.