Senior Full Stack Engineer — C#/.NET & React on Azure

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

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.