Senior .NET Cloud Developer — AI for Booking Platform

Youngs Employment Services; City of Westminster; Hybrid; GBP 65,000 - 75,000; Full time

Benefits offered by this job

Bonus

Job summary

Youngs Employment Services seeks a Senior Software Developer to join a small, capable tech team moving a legacy booking platform to Azure and modern .NET. You will help build an AI-powered quotation platform and deliver production services with a strangler-fig migration.

You will design and ship services, contribute to migration strategy and work daily with AI-assisted tools in a hands-on senior role based in London with a hybrid setup.

Qualifications

• 6–10 years of hands-on software development, predominantly in .NET/C#.
• Recent experience with modern .NET (preferably .NET 8 or later).
• Blazor experience is required.
• Strong Azure experience including App Service/Container Apps, Azure SQL, API Management and DevOps pipelines.
• Experience modernising legacy systems using strangler-fig or incremental migrations.
• Solid REST API design skills, microservices and event-driven patterns.
• Experience with AI-assisted development tools (GitHub Copilot, Cursor, Claude Code).
• Identity and authentication experience (Entra ID/Azure AD, OAuth2 or OIDC).
• SQL Server or Azure SQL data modelling, performance and migration work.
• Clear communication; ability to own tasks in a small permanent team.
• Exposure to React or React Native in API-supported apps.
• Experience with retrieval-augmented generation and LLM features.

Responsibilities

• Design, build and support cloud-based services in .NET 10 across Azure API Management and Azure SQL.
• Assist in modernising a core booking platform via strangler-fig migration.
• Work on anti-corruption layers, data sync, staged cutovers and zero-downtime releases.
• Develop reliable CI/CD pipelines with Azure DevOps and GitHub Actions.
• Build secure services in the Entra ID authentication space for staff and customers.
• Contribute to AI-enabled quotation and knowledge tools with human-in-the-loop processes.
• Collaborate with mobile, product and engineering teams where APIs are consumed.
• Participate in architecture reviews, code reviews and mentoring of graduates.

Skills

dotnet/c#

Blazor

Azure Cloud

Azure DevOps

API Design

Microservices

SQL Server/Azure SQL

React/React Native

AI-assisted tools

Identity/OAuth2/OIDC

Tools

GitHub

Azure DevOps Pipelines

Cursor/Claude Code

Job description

Youngs Employment Services seeks a Senior Software Developer to join a small, capable tech team moving a legacy booking platform to Azure and modern .NET. You will help build an AI-powered quotation platform and deliver production services with a strangler-fig migration.

You will design and ship services, contribute to migration strategy and work daily with AI-assisted tools in a hands-on senior role based in London with a hybrid setup.