ASP.NET Core Authentication System

I’m building a new ASP.NET Core Web API and I want the authentication and authorization layer to be rock-solid from day one. Here’s what I need built and wired up: • User registration and login endpoints, following a clean service / repository pattern... (Budget: £10 - £20 GBP, Jobs: .NET, .NET Core, .NET Core Web API, ASP.NET, ASP.NET MVC, C# Programming, Microsoft SQL Server, Security)