Senior Back End Engineer - Contract

Flagstone; Greater London; On-site; GBP 90,000 - 115,000; Full time

Job summary

Flagstone is hiring a Senior Back End Engineer to shape the next generation of its cloud-based savings platform. You will contribute to high-quality systems, drive architectural decisions, and collaborate with cross-functional teams to solve complex business challenges.

The role requires 7+ years of C#/.NET experience, strong design and testing discipline, and the ability to mentor junior engineers in a fast-paced, Azure-driven environment.

Qualifications

• 7+ years commercial development experience with C#/.NET/.NET Core.
• Strong understanding of SOLID, EDA and DDD.
• Experience of RESTful API design.
• Experience of Azure cloud development, and a cloud-first approach.
• Proficiency in Test-Driven Development with NUnit, MSTest or Selenium.
• Excellent verbal and written communication.
• Ability and enthusiasm to coach junior engineers.

Responsibilities

• Develop and maintain high-quality, scalable backend systems on Azure.
• Collaborate in an Agile team, influencing software architecture and best practices.
• Contribute to automated testing to ensure software quality.
• Mentor and coach junior engineers.

Skills

Emotional intelligence

Proactivity

Excellent communication

Coaching juniors

Tools

C#

.NET

.NET Core

RESTful API design

Azure cloud development

TDD (NUnit MSTest Selenium)

Job description

What is Flagstone?

Flagstone is many things. 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 lastly, a thriving, profitable business – where smart people do their best work.

Each definition shares a common thread: our unique culture. It’s our pride and joy. And our competitive advantage.

A feel for our culture:

To revolutionise the savings market, we need to be at our best. But high performance takes more than talent – it takes a culture of kindness, respect, and growth.

That’s why we’re building a diverse, inclusive community, where your voice is heard and valued. Where, with close support and room to develop, you can surpass even your own expectations. And be rewarded for it.

We may not change the world, but wecan change the world of financial technology. And all it takes is a winning mix of drive, talent, and empathy. Our culture celebrates all three. But enough about us. Let’s talk about you.

Does this sound like you?

You’re a Senior Back End Engineer, ideally with 7+ years’ experience, who’s excited to forge a new way to save. You’ll have delivered on large scale projects of work, and will be excited about producing and maintaining high quality systems, including system design and architecture. You work in partnership with relevant teams across an organisation to identify how technology can solve business challenges and will be capable of answering “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 where we use a variety of PaaS type services including Web Apps, Functions, Azure SQL, Cosmos, Azure Service Bus, AppInsights, APIM etc.

As a Senior Back End Engineer, you will play an active role in an Agile software team, fostering best practice and automation to ensure software quality. As a subject matter expert in your domain, and through working collaboratively, you will get to work on new features and deliver a high quality, resilient product. You will always look to help improve the software engineering processes and practices, and to influence the software architecture.

What you’ll bring:

• Ideally over 7 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 Test-Driven Development (TDD) methodologies, demonstrating proficiency in writing and maintaining test cases using one or more of the following libraries, or similar: NUnit, Microsoft Test Framework and Selenium
• 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
• Ability and enthusiasm to coach and guide junior engineers

All are welcome

At Flagstone, we’re assembling a diverse team that defies our industry’s norms. Think this role could suit you?

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