Senior Full Stack Engineer - Contract

Flagstone Group; Greater London; Hybrid; GBP 90,000 - 120,000; Full time

Job summary

Flagstone Group is an online savings platform seeking a Senior Full Stack Engineer to help forge a new path in fintech. You will work in an Agile team, delivering high-quality systems with a focus on C#/.NET, Azure, and React.

You’ll collaborate with cross-functional teams, design scalable solutions, and mentor junior engineers, applying SOLID, DDD, and EDA principles to real business challenges.

Qualifications

• You are a Senior Full Stack Engineer with 7+ years of commercial development experience.

Responsibilities

• Contribute in an Agile software team to deliver high-quality features.

Skills

C# / .NET / .NET Core

JavaScript

React

SOLID principles

EDA

DDD

RESTful API design

Azure cloud

SQL

TDD (NUnit, SpecFlow, Selenium)

Emotional intelligence

Proactivity

Communication

Mentoring juniors

Tools

NUnit

SpecFlow

Selenium

ASP.NET Core

Azure

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 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.

Does this sound like you?

You’re a Senior Full Stack 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:

As a Senior Full Stack 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, as well as acting as a real team player who is approachable and a positive role model.

What you’ll bring:

We are a Microsoft shop, so our core language is C# and our platform is entirely in the cloud on Azure. We’d love to see experience in a combination of the below:

• Ideally over 7 years commercial development experience with C# / .Net / .Net Core
• Front end coding ability with JavaScript, CSS, HTML and React
• 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
• SQL skills
• 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: NUnit, Microsoft.TestFramework, SpecFlow 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.