C# Senior Software Developer - Onsite 

My client is seeking a talented C# Senior Software Developer to join their Preston-based team. This role offers an exciting opportunity to lead projects, mentor junior developers, and work on high-impact, secure banking solutions. You will be a key contributor to web portal and API development, ensuring performance, security, and reliability in a dynamic environment.

This role is ideal for developers with strong technical expertise who are looking to grow into leadership or team management responsibilities.

Key Responsibilities

Develop and maintain web portals using ASP.NET MVC / .NET Core

Design and integrate REST APIs with internal and third-party services

Implement secure authentication mechanisms (JWT, OAuth2, API Keys)

Connect applications to relational databases using Entity Framework Core (DbContext, LINQ, Migrations)

Debug and trace request flows from UI → Controller → API → Datab...