Flagstone
Senior Back End Engineer - Contract

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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 we can 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.
Reasons to use Rodeo
I’m in my final year doing Economics and I don’t know whether to apply for grad schemes now or do a masters first. What do you think?
Honest answer — it depends on where you want to end up. A lot of top grad schemes (Big 4, civil service, banking) don’t need a masters. Let’s look at the ones you’d be competitive for now, and we can decide if a masters actually adds anything.
Also worth knowing: most autumn 2026 applications are open now. Timing matters more than you think.
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Grad scheme, placement, apprenticeship? Not sure what you want yet — that's fine. Your agent talks it through with you and turns "I have no idea" into a shortlist.
Graduate Consultant — 2026 Scheme
Why you're a good match
StrongYour economics background and your summer at a regional bank line up with what PwC looks for on the consulting scheme. Applications close in four weeks.
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Why you're a good match
You’ve got the grades and the economics background, and your bank internship is exactly the experience this scheme looks for. Apply soon — deadlines close within the month.
Experience fit
Your summer at the bank plus your econometrics coursework map directly to the day-one responsibilities on this scheme — client modelling, market briefings, and deal support.
Only hits
No noise. No "maybe this fits." Just roles with a clear explanation of why they're right — and where to focus when applying.
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.


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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? We encourage you to apply, no matter your background.
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