Mid Level Full-Stack .Net Developer
Summary
Mid-level full-stack .NET developer in Cardiff who designs, builds and maintains ASP.NET Core (C#) web applications with complex business logic, SQL Server/EF Core data access, and REST/SOAP third-party integrations. Frontend work uses Razor Pages, jQuery, Data Tables and AJAX, with AI-assisted development workflows encouraged.
We are seeking a highly analytical and solutions-driven Mid Level Full Stack .NET Developer to design, develop, and maintain scalable web applications with complex business logic and third-party integrations.
This role combines backend engineering, frontend development, and intelligent automation practices that include using AI-assisted development workflows to improve efficiency, code quality, and architectural decision-making.
Key Responsibilities
- Design and maintain ASP.NET Core applications using C#
- Implement complex LINQ queries and EF Core data access patterns
- Optimise database interactions and query performance
- Build and maintain REST and SOAP integrations with external providers
- Implement robust logging, validation, and exception handling
Frontend Development
- Manage conditional UI rendering based on business rules
- Ensure smooth client-side/server-side integration
System Architecture & Business Logic
- Translate complex business requirements into maintainable code
- Maintain separation of concerns across services and UI layers
- Improve reliability of provider communications and validation workflows
Technical Skills
Core Stack
- C# / .NET Core MVC
- Entity Framework Core
- SQL Server
- LINQ
Frontend
- Razor Pages / MVC
- jQuery
- Data Tables
- AJAX
Integration & Data
- SOAP services
- REST APIs
- Logging and diagnostics
- Repository / Service patterns
- Performance optimization
- Business rule modelling
- Strong problem solver with attention to edge cases
- Detail-oriented in both backend logic and UI behaviour