Senior Full-Stack Engineer | C#, .NET & Azure

Jackalope Digital LLC; Greater London; Hybrid; GBP 90,000 - 120,000; Full time

Job summary

Flagstone is looking for a Senior Full Stack Engineer to help forge a new path in financial technology within the UK. You will deliver high-quality systems, participate in architecture decisions, and collaborate across teams to solve complex business problems.

You will work in a Microsoft-centric stack (C#, .NET, Azure) on cloud-native solutions, with a focus on scalable, testable code and modern development practices. You’ll mentor junior engineers and champion engineering excellence.

Qualifications

• 7+ years of commercial development experience with C#/.NET/.NET Core.
• Front-end experience with JavaScript, CSS, HTML and React.
• Strong understanding of SOLID, EDA and DDD.
• Experience designing RESTful APIs.
• Azure cloud development and cloud-first approach.
• Proficient in SQL.
• Strong TDD practices with NUnit, Microsoft TestFramework, SpecFlow or Selenium.
• Excellent communication and collaborative mindset.
• Ability to coach and guide junior engineers.

Responsibilities

• Work in an Agile software team to deliver high-quality features.
• Contribute to software architecture and drive improvements to engineering processes.
• Collaborate with cross-functional teams to solve business challenges and mentor others.

Skills

C# / .Net

JavaScript/React

REST API design

Azure cloud

SQL

TDD

SOLID/EDA/DDD

Communication

Coaching juniors

Tools

NUnit

Microsoft Test Framework

SpecFlow

Selenium

Azure DevOps

Job description

Flagstone is looking for a Senior Full Stack Engineer to help forge a new path in financial technology within the UK. You will deliver high-quality systems, participate in architecture decisions, and collaborate across teams to solve complex business problems.

You will work in a Microsoft-centric stack (C#, .NET, Azure) on cloud-native solutions, with a focus on scalable, testable code and modern development practices. You’ll mentor junior engineers and champion engineering excellence.