Senior .NET Integration Engineer - permanent role

Senior .NET Integration Engineer

City of London (3 days in office)

Up to £85,000

We are seeking a Senior Integration Engineer to design and build scalable, enterprise-grade UI systems using Blazor integrated with .NET APIs. This role focuses on owning the UI and integration layer within a modern microservices architecture, ensuring performance, scalability, and excellent user experience.

You will work across UI architecture, Back End integration, and system design-applying clean architecture principles to deliver robust, modular applications for a financial services environment.

Key Responsibilities

• Build modular, scalable Blazor-based UI systems for enterprise applications
• Define UI architecture patterns including state management, routing, and component design
• Work closely with Back End teams to integrate .NET APIs and microservices
• Translate business and design requirements into high-quality UI solutions
• Ensure performance, maintainability, accessibility, and responsive design standards
• Contribute to UI best practices, architecture decisions, and system design
• Develop integrations with third-party systems and internal platforms using APIs
• Support development of web applications using C#, ASP.NET, Razor, and JSON-based services

Skills & Experience

• 5+ years' experience in .NET Front End development
• Strong hands-on experience with Blazor (Server and/or WASM)
• Solid understanding of component-based UI architecture and SPA design
• Experience working with REST APIs and .NET Core (v7+)
• Strong C# and asynchronous programming skills
• Experience with Azure (Logic Apps, Web Apps, Monitor)
• Familiarity with CI/CD pipelines (Azure DevOps) and automated testing
• Strong UI/UX awareness (layout, typography, responsiveness, design consistency)
• Exposure to React or similar Front End frameworks beneficial
• Financial Services industry experience