Senior Backend Engineer at Flagstone Group LTD

We are Flagstone, an online savings platform that helps individuals, businesses, and charities manage, protect, and grow their cash. We operate as a profitable, growing business with a culture built on collaboration, inclusion, and continuous development. Our team works together to deliver technology that improves how people handle their savings, and we are now looking for a Senior Backend Engineer to strengthen our engineering function.

Key outcomes

• Design, develop, and maintain high-quality backend systems that support our savings platform, ensuring resilience and scalability.
• Collaborate with product and engineering teams to translate business requirements into technical solutions using C# and .NET on Azure.
• Apply best practices in system design, architecture, and automation within an Agile environment to deliver reliable software.
• Improve engineering processes and influence architectural decisions as a subject matter expert in backend development.
• Coach and guide junior engineers, fostering a culture of shared learning and technical excellence.
• Communicate technical concepts clearly to both technical and non-technical stakeholders to support informed decision-making.

Requirements

• At least seven years of commercial software development experience using C# and .NET or .NET Core.
• Strong understanding of SOLID principles, Event-Driven Architecture, and Domain-Driven Design.
• Experience designing and implementing RESTful APIs.
• Hands-on experience developing on Microsoft Azure, including services such as Web Apps, Functions, Azure SQL, Cosmos DB, Service Bus, and API Management.
• Proficiency with SQL and relational database development.
• Practical experience applying Test-Driven Development, including writing and maintaining tests with frameworks such as NUnit, Microsoft Test Framework, SpecFlow, or Selenium.
• Excellent verbal and written communication skills, with the ability to explain technical topics to varied audiences.
• Demonstrated emotional intelligence, initiative, and a collaborative approach to problem-solving.
• Enthusiasm for mentoring and supporting the development of junior engineers.
• Proficiency in English.

Compensation

We offer a comprehensive benefits package that supports your health, financial wellbeing, and professional growth. This includes life insurance equal to four times your annual salary, dental and optical care, matched pension contributions of five percent, income protection, and private healthcare. You will also receive remote working equipment, a £1,000 annual learning bursary, 25 days of holiday plus bank holidays, flexible bank holidays, quarterly wellness half-days, three additional days of community and charity leave each year, gym discounts, and participation in our employee share scheme. The role is fully remote, with the option to work from anywhere.

How to apply

If this opportunity aligns with your experience and interests, we invite you to submit your application. We welcome candidates from all backgrounds and look forward to learning more about how you could contribute to our team.