Mid C#/.Net Engineer

Flagstone Group LTD; City Of London; Hybrid; GBP 50,000 - 75,000; Full time

Job summary

A leading financial technology company in London seeks a Back End Engineer to develop high-quality systems. You will work with C# in a cloud-based Azure environment, engaging in an Agile team to deliver impactful solutions. Ideal candidates will have over 3 years of experience and strong communication skills to bridge technical and non-technical discussions. The company offers competitive rewards and a flexible working environment.

Benefits

Competitive bonus scheme

Flexible benefits budget

Private health care

Learning and development budget

Enhanced Parental Leave

Qualifications

• 3+ years of commercial development experience is ideal.
• Good understanding of Event Driven Architecture (EDA) and Domain-Driven Design (DDD).
• Ability to communicate technical information to both technical and non-technical stakeholders.

Responsibilities

• Produce and maintain high-quality systems to achieve business objectives.
• Collaborate in an Agile software team to deliver new features.
• Contribute to the development process and understand system design.

Skills

C#/ .NET / .NET Core

RESTful API design

Azure cloud development

SOLID principles

Emotional intelligence

Testing strategies

Tools

Microsoft Azure

Agile methods

Job description

Overview

Flagstone is an online savings platform reinventing how individuals, businesses, and charities manage, protect, and grow their cash. A diverse group of people bound by a collaborative spirit and shared purpose, and a thriving, profitable business where smart people do their best work. Our culture is a differentiator—a culture of kindness, respect, and growth.

To revolutionise the savings market, we need to be at our best. We’re building a diverse, inclusive community where your voice is heard and valued, with close support and room to develop, and you can surpass even your own expectations and be rewarded for it. We may not change the world, but we can change the world of financial technology. Our culture celebrates drive, talent, and empathy.

Let’s talk about you.

Does this sound like you?

You’re a Back End Engineer, ideally with 3+ years’ experience, who’s excited to forge a new way to save. You’re focused on producing and maintaining high‑quality systems to achieve business objectives, contributing to the development process, and understanding system design and architecture. You’ll work in partnership with relevant teams across the organisation to identify how technology can solve business challenges and be able to explain how and why technology is designed and delivered.

What you’ll do

We are a Microsoft shop, so our core language is C# and our platform is entirely in the cloud on Azure, using a variety of PaaS services including Web Apps, Functions, Azure SQL, Cosmos, Azure Service Bus, AppInsights, and APIM. As a Back End Engineer, you will play an active role in an Agile software team, collaborating to deliver new features and a high‑quality, resilient product.

What you’ll bring

• Ideally over 3 years commercial development experience with C#/ .NET / .NET Core
• A good understanding of SOLID principles, Event Driven Architecture (EDA), and Domain-Driven Design (DDD)
• Experience of RESTful API design
• Experience of Azure cloud development, and a cloud‑first approach
• A good foundation in testing strategies or Test-Driven Development (TDD) methodologies
• Emotional intelligence. You actively listen and provide thoughtful solutions
• Proactivity and the ability to demonstrate initiative positively and collaboratively
• Excellent verbal and written communication, with the ability to communicate technical information to both technical and non‑technical stakeholders

How we reward you

At Flagstone, the benefits extend beyond fruit and snacks. We invest in your health, wealth, and professional development. Here’s a selection of our benefits:

• Competitive bonus scheme — designed to reward and recognise high performance
• Flexible benefits budget — fund meaningful benefits (e.g., health/performance related allowances)
• A range of salary sacrifice options to help you save on electric cars, nursery schemes, home and tech goods
• Around the World scheme — 3 months work from anywhere
• Mental wellbeing support — access therapy and mental health sessions
• Learning and development — £1,000 personal development budget
• Private health care — AXA benefits, reduced gym memberships
• Medical cash plan — support for dental and optical expenses
• Life insurance and Income Protection — four times annual salary
• Matched pension contributions up to 5%
• 25 days holiday plus bank holidays, well‑being days and volunteering days
• Enhanced Parental Leave — enhanced maternity, paternity and adoption pay

All are welcome.

At Flagstone, we’re assembling a diverse team that defies our industry’s norms. Think this role could suit you? We encourage you to apply, no matter your background.

#LI-Hybrid