C# Senior Software Developer

My client is seeking a talented C# Senior Softwar 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 → Database → Response
Maintain and publish API documentation via Swagger / OpenAPI
Ensure API security, reliability, and performance (error handling, retry logic, logging, timeouts, CORS)
Collaborate with database, infrastructure, and QA teams for portal and API releases
Participate in code reviews, version control, and CI/CD deployment workflows

Required Technical Skills

C# (strong proficiency)
ASP.NET MVC or .NET Core Web API
MVC concepts: Routing, Controllers, Filters, Middleware, Model Binding, Dependency Injection
Entity Framework Core (DbContext, DbSet, OnModelCreating, LINQ) and ADO.NET/Raw SQL experience
MS SQL Server or MySQL database experience
HTML5, CSS3, JavaScript
REST API expertise and integration (HttpClient, RestSharp, JSON serialization/deserialization, CORS, HTTPS, API security)
Git version control and CI/CD workflows (Azure DevOps, GitLab CI preferred)
Hosting experience with IIS or Kestrel
Docker basics (preferred but not mandatory)

Preferred/Bonus Skills

Experience with fintech or payments API integration
Cloud services (Azure, AWS) hosting basics
Webhooks and event-based APIs
Structured logging tools (Splunk, ELK, App Insights)
Performance optimization and API rate-handling

Why Join My Client

Be part of a pioneering fintech/secure banking technology company
Opportunity to mentor and lead junior developers
Work in a supportive, collaborative, and technically driven environment
Gain experience in high-security, mission-critical software projects

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C# Senior Software Developer

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