Lead Dotnet Developer

Job Title: Sr. .NET App Architect/Lead Developer

Location: Columbus, OH 43215 (Onsite Mon-Fri)

Duration: Long-term contract

Description:

Diversified Systems is searching for a Senior .NET Application Architect and Lead Developer to provide technical leadership for application migration and modernization efforts following a recent tax accounting system implementation. This role reports directly to the IT Director and is responsible for assessing existing MVC based and Entity Framework applications, defining architecture recommendations, and leading hands-on development work. This is a delivery focused role requiring both architectural judgment and direct coding responsibility in a fast paced, high visibility environment.

Responsibilities:

• Review existing MVC based applications and identify required migration or modernization work.
• Define and recommend application architecture patterns and technical standards appropriate to the current environment.
• Break technical work into milestones, deliverables, and development tasks.
• Provide development estimates and support project planning activities.
• Lead hands on development of .NET applications and APIs (Rest & GraphQL).
• Design, develop, and optimize SQL Server stored procedures, indexes, and queries.
• Ensure best practices with Entity Framework code first and data access patterns.
• Develop and enhance front end utilizing react and prime react components
• Collaborate with business analysts to translate functional requirements into technical designs.
• Work closely with the development team, business analysts, and IT Project Manager to define scope and sequencing.
• Mentor and support other developers through code reviews and troubleshooting.
• Support development workflows using GitHub Enterprise.
• Communicate progress, risks, and technical recommendations clearly to the IT Director and project leadership.
• Perform other related duties as assigned.

Requirements:

• Professional .NET development experience required.
• Demonstrated experience taking ownership of existing applications and codebases required.
• Deep expertise with C#, .NET, and Entity Framework required.
• Strong experience designing and building RESTful APIs and using GraphQL required.
• Advanced SQL Server expertise, including stored procedures and indexing strategies, required.
• Proven experience using GitHub Enterprise required.
• Demonstrated experience leading development efforts and mentoring other developers required.
• Strong written and verbal communication skills required.
• Experience migrating or modernizing legacy MVC applications highly desired.
• Experience with React, Vite, and NodeJS highly desired.
• Experience stabilizing or improving applications in active production environments highly desired.
• Experience working in public sector or highly visible environments highly desired.
• Experience supporting financial, tax, or property-related systems highly desired.