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Principal Software Engineer C# .Net AWS - FinTech

Client Server | london, United-Kingdom | Posted May 30, 2026

Position Overview

Principal Software Engineer / Developer (C# .Net AWS Python) London / WFH to £120k

Would you like to join a growing and profitable scale-up that is viewed as a leading FinTech disruptor in a senior role that will allow you a great deal of influence and progression?

As a Principal Software Engineer you will architect and build highly performant and scalable solutions using the Microsoft tech stack and SOLID design principles, collaborating with cross functional Agile project teams in 2 week Sprints, you'll be an advocate of best practice and ensure software is delivered to schedule.

There's a host of new features and development work and you'll also help to drive the adoption of AI within the business, introducing things like chat bots and exploring the use of AI to make process improvements.

This is an impactful role where you'll report into and collaborate with the CTO, you'll have a lot of visibility and quickly see the results of your work.

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