Senior Software Developer

Youngs Employment Services; Greater London; Hybrid; GBP 65,000 - 75,000; Full time

Job summary

Youngs Employment Services seeks a Senior Software Developer to help transform a legacy booking system to Azure-based .NET, while building AI-powered quotation tools. You will deliver production services, perform strangler-fig migrations, and work with AI-assisted development tools in a collaborative, senior-led environment.

The role is hands-on, with a focus on cloud platforms, secure APIs, and a modernisation roadmap, in a hybrid London office setup.

Qualifications

• 6–10 years of hands-on software development, primarily in .NET/C#.
• Recent experience with modern .NET (≥ .NET 8).
• Blazor experience across front-end apps.
• Strong Azure experience (App Service/Container Apps, Azure SQL, API Management).
• Experience modernising legacy systems via strangler-fig migration.
• Solid REST, microservices and event-driven patterns understanding.
• Familiarity with AI-assisted dev tools (GitHub Copilot, Cursor, Claude Code).
• Identity/auth with Entra ID/Azure AD and OAuth2/OIDC.
• SQL Server/Azure SQL data modelling, performance, migrations.
• Clear communication and ownership from design to delivery in a small team.

Responsibilities

• Design, build and support cloud-based services in .NET across Azure platform.
• Lead gradual migration of legacy booking platform using strangler-fig approach.
• Implement anti-corruption layers, data sync, staged cutovers and zero-downtime releases.
• Create and maintain CI/CD pipelines with Azure DevOps and GitHub Actions.
• Develop secure services with Entra ID for staff and customer auth.
• Contribute to AI-enabled quotation and knowledge tools with human-in-the-loop features.
• Collaborate with mobile, product and engineering teams to consume APIs.
• Participate in architecture discussions, code reviews, and mentoring.

Skills

C#/.NET

Blazor

Azure

API Management

CI/CD

REST API design

Microservices

Event-driven

GitHub Copilot

Entra ID

OAuth2/OIDC

SQL Server

GitHub Actions

Tools

Azure DevOps

GitHub Actions

SQL Server Tools

Job description

Senior Software Developer

Location: London - hybrid, 3 days per week in the office

Salary: c£65,000 - £75,000 + bonus

The Opportunity - Senior Developer - Cloud Platform & AI

We're recruiting for a Senior Software Developer to join a small, highly capable technology team delivering a major legacy-to-cloud transformation. The business is moving its core booking platform to an Azure and modern .NET solution, while also building an AI-powered quotation and knowledge platform that will be central to how the organisation works. This is a hands-on senior engineering role and you'll be joining at a point where the architecture, delivery approach and product direction still matter. You'll design and ship production services, contribute to a structured strangler-fig migration, and use AI-assisted development tools such as Cursor and Claude Code as part of everyday engineering practice. The role would suit an experienced Senior Developer, or a strong Developer ready to step up in a collaborative, senior-led environment.

What You'll Be Doing

• Design, build and support cloud-based services in .NET 10 across Azure API Management, Azure SQL and the wider Azure platform.
• Help modernise a business-critical booking platform using an incremental strangler-fig migration approach.
• Work on anti-corruption layers, two-way data synchronisation, staged cutovers, validation and zero-downtime release patterns.
• Build and maintain reliable CI/CD pipelines using Azure DevOps and GitHub Actions.
• Develop secure services within the Entra ID identity plane for staff and customer authentication.
• Contribute to AI-enabled quotation and knowledge tools, including human-in-the-loop quote drafting and retrieval-augmented knowledge features.
• Collaborate closely with mobile, product and engineering colleagues where your APIs are consumed across different surfaces.
• Take part in architecture discussions, code reviews and mentoring of graduate developers.

What We're Looking For

• Strong hands-on software development experience, ideally 6-10 years, with the majority in .NET/C#.
• Recent experience with modern .NET, ideally .NET 8 or later.
• Blazor experience.
• Strong Azure experience, including App Service or Container Apps, Azure SQL, API Management and Azure DevOps pipelines.
• Experience modernising legacy systems, ideally using strangler-fig or similar incremental migration approaches.
• Good understanding of REST API design, microservices and event-driven architecture patterns.
• Practical day-to-day use of AI-assisted development tools such as GitHub Copilot, Cursor, Claude Code or similar.
• Identity and authentication experience, including Entra ID/Azure AD, OAuth2 or OIDC.
• Comfortable working with SQL Server or Azure SQL data modelling, performance and migration activities.
• Clear communication skills and the confidence to work in a small permanent team where engineers take ownership from design through to delivery.

Useful Additional Experience

• Exposure to React or React Native, particularly where APIs support web or mobile products.
• Experience with retrieval-augmented generation, vector search or integrating LLM-based features into production products.
• Experience working in a scale-up, transformation programme or small permanent technology team.

Salary: c£65,000-£75,000, with some flexibility.