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

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Senior .NET Integration Engineer - permanent role

Job Details