FullStack Developer - Dotnet

Keystone, a division of Valsoft, is seeking a highly motivated Fullstack Developer to support and modernize our Microsoft-based application stack. This role involves maintaining and enhancing an existing legacy ASP application, assisting in the transition to modern technologies (e.g., Blazor, .NET Core), integrating with ValPay, and managing CI/CD pipelines and IIS-hosted infrastructure.

We are open to junior candidates with high learning capacity and strong technical fundamentals who are eager to take ownership and grow within a fast-paced, pragmatic development environment.

Key Responsibilities

• Maintain and extend a production ASP (Classic/ASP.NET Web Forms) application with high attention to quality, security, and performance.
• Modernize components of the application using Blazor WebAssembly, C#, and .NET Core as part of a long-term migration strategy.
• Integrate ValPay (Valsoft’s preferred payment solution) into the existing payment workflows, ensuring PCI-compliant implementation and smooth user experience.
• Manage and troubleshoot Windows Server environments, particularly IIS-hosted applications, ensuring reliability and minimal downtime.
• Design, implement, and improve CI/CD pipelines, leveraging GitHub Actions, Azure DevOps, or comparable tools.
• Document systems, processes, and technical decisions clearly and thoroughly

Requirements

• Proficiency in C# and .NET Core/.NET 6+ (ASP.NET, Blazor WebAssembly, Razor Components).
• Familiarity with legacy ASP or ASP.NET Web Forms applications.
• Experience with CI/CD pipelines (e.g., GitHub Actions, Azure DevOps, Jenkins).
• Solid understanding of Microsoft IIS administration, including deployment, troubleshooting, and log analysis.
• Working knowledge of HTML/CSS/JavaScript, particularly in the context of Blazor or WebAssembly.
• Comfort with Git-based workflows and branch strategies.
• Strong analytical and problem-solving skills.
• Excellent verbal and written communication.

Preferred Qualifications

• Familiarity with payment integration libraries (e.g., Adyen, Stripe).
• Exposure to multivalue databases.
• Understanding of DevOps practices and the software development lifecycle (SDLC).
• Experience with automated testing and test-driven development (TDD).
• Ability to thrive in a hybrid legacy-modern codebase and help reduce technical debt incrementally.