Full Stack Application Developer (C#, Razor Pages, .NET, SQL)

About Fidelio:

Fidelio is a leading dental insurance provider undergoing a major transformation—replacing legacy systems with scalable, secure, and modern software solutions. We operate in a dynamic, fast-paced environment where innovation, adaptability, and problem-solving are key. Our team is actively building the infrastructure and processes that will support our next stage of growth. If you're someone who thrives in a hands-on, evolving development space, Fidelio is the place for you.

Position Summary:

We're looking for a Full Stack Application Developer with at least 5 years of experience in C#, Razor Pages, .NET , and SQL to join our growing development team. You'll be responsible for building new functionality, maintaining existing applications, and helping drive our ongoing modernization efforts. This is a highly collaborative, roll-up-your-sleeves kind of role with real business impact.

Key Responsibilities:

Develop and maintain scalable applications using C# , ASP.NET Core (Razor Pages) , and SQL Server Lead and support the transition from legacy systems to modern .NET-based platforms Troubleshoot and resolve software bugs, system issues, and data integrity problems Translate business requirements into efficient, maintainable code Design intuitive front-end components and secure, high-performance back-end logic Participate in architectural planning, code reviews, and system testing Maintain internal websites for data accuracy, security, and compliance Document features and functionality, and support internal training when needed

Required Skills & Qualifications:

Minimum 5 years of professional experience in full stack application development Strong expertise in C# , .NET Framework/Core , and Razor Pages Solid knowledge of SQL and relational database design Front-end development experience (HTML, CSS, JavaScript within .NET stack) Excellent problem-solving skills and attention to detail Comfortable working in a fast-paced environment where processes are being developed in real time, and able to pivot quickly between tasks and priorities as needed Experience using Team Foundation Server (TFS) for version control and work item tracking

Preferred Qualifications:

Experience modernizing or migrating legacy systems Familiarity with healthcare or insurance systems Exposure to reporting tools, especially Power BI and Fast Reports Knowledge of secure coding best practices and system performance tuning

Job Types:

Full-time, Part-time Pay:

$80,000.00 - $150,000.00 per year Expected hours: 25 - 40 per week

Benefits:

Dental insurance Flexible schedule Health insurance Paid time off

Work Location:

In person