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Principal C# Developer .Net AWS - FinTech

Client Server· London, England, United Kingdom· Up to £120,000/yr
Posted 17 Jun 2026 · Added 18 Jun 2026, 19:55Principal Software Engineer
Claude
Client ServerRecruitment agencyfounded 1999
Levels.fyi · global comp
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Principal C# Developer / Engineer (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 C# Developer 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.

Location / WFH:

There's a hybrid policy, with two days in the brand new London offices and flexibility to work from home two days a week (Thursdays and Fridays).

About you:

You are an experienced Software Developer / Engineer with a strong knowledge of modern best practice

You have strong C# backend development skills, ideally also Python coding skills

You have a good knowledge of AWS

You have experience of working on highly scalable systems

You have a strong knowledge of Computer Science fundamentals such as OOP, Data Structures, Design Patterns

You have experience with, or a strong interest in Artificial Intelligence and are keen to explore the possibilities further e.g. ChatGPT, Claude, Cursor, Copilot

You have strong analysis and problem solving skills alongside organisation and planning abilities

You have business acumen and advanced communication / stakeholder management skills

What's in it for you:

As a Principal C# Developer you will earn a competitive package including:

Salary to £120k

Bonus (c20%)

Pension (5% employer contribution)

25 days holiday (increasing to 27 after two years and 30 after)

Life Assurance (4x base salary)

Employee Assistance Programme

Range of training, career development and supported learning

Impactful role working on cutting edge technology

Apply now to find out more about this Principal C# Developer / Engineer (.Net AWS Python) opportunity.