Senior .NET Developer (Legacy Application Modernization)

Date Posted: 09/03/2026

Hiring Organization: Rose International

Position Number: 506905

Industry: Government/Staffing

Job Title: Senior .NET Developer (Legacy Application Modernization)

Job Location: Columbus, OH, USA, 43223

Work Model: Hybrid

Work Model Details: 2 Days onsite per week

Shift: Monday- Friday, Regular shift

Employment Type: Temporary

FT/PT: Full-Time

Estimated Duration (In months): 10

Min Hourly Rate($): 50.00

Max Hourly Rate($): 55.00

Must Have Skills/Attributes: .Net, C#, SSIS, Web

Experience Desired: .NET Web Developer developing ASP.NET MVC applications with ADO.NET (10 yrs); ASP.NET development using C# (10 yrs); SQL Server database design and development ,including query optimization, tables, views, stored proc (10 yrs); Developing web applications using .NET Framework4.0 or higher (10 yrs); Service Oriented Architecture (SOA) experience developing and securing WCF (10 yrs); N-tier environments as related to development and deployment (10 yrs); Implementing AJAX-enabled controls within ASP.NET web applications (5 yrs)

**C2C is not available**

Job Description
Required Skills, Experience, Qualifications and Abilities:
10 years of experience developing ASP.NET MVC applications with ADO.NET as a .NET Web Developer
10 years of ASP.NET development experience using C#
10 years of SQL Server database design and development experience including query optimization, tables, views, stored procedures, and functions
10 years of experience developing web applications using .NET Framework 4.0 or higher
10 years of Service Oriented Architecture experience developing and securing Windows Communication Foundation
10 years of experience working with N-tier environments related to application development and deployment
10 years of experience with code repositories, code promotion, and recovery strategies using TFS
5 years of experience developing applications using Entity Framework 4.0 or later
5 years of experience developing reports using SSRS and SSIS and making them accessible within an MVC web application
5 years of experience developing projects using Agile methodology with TFS or DevOps
5 years of experience developing with Visual Studio including 2 years with Visual Studio 2019
5 years of experience using TFS or Azure DevOps including Git, Boards, and CI/CD pipelines
2 years of REST API experience
Strong communication and leadership skills
Strong influence, collaboration, and negotiation experience
Ability to collaborate with supporting resources across business and functional lines
Excellent oral and written communication skills
Strong meeting and work-session facilitation skills
Ability to work independently and as part of a team
Ability to manage time and resources to meet assigned deadlines
Strong understanding of prioritization stemming from the elicitation of system or user requirements
Excellent organizational skills
Proven analytical, planning, problem-solving, and decision-making skills
Must be knowledgeable in the English language
Must speak and use the English language clearly and understandably
Ability to provide technical guidance and mentoring to technical staff
Ability to demonstrate technical and functional competence during the interview
Required experience must be clearly documented for review and verification
Candidate must be willing and able to attend an in-person interview at the client site
Resource will have a background check conducted by the client

Preferred Skills, Experience, Qualifications and Abilities:
5 years of experience implementing AJAX-enabled controls within ASP.NET web applications is highly desired

Job Overview:
The selected Consultants will work closely with the designated IT supervisor, project managers, other developers, and supporting staff in an Agile development environment. The work will include requirements gathering, application design, application development, testing, deployment, and technical support. The Consultants will be responsible for developing new applications and rewriting legacy applications as .NET applications using C#, ASP.NET Core MVC, Web API, Windows Forms, SQL Server, SSRS, SSIS, and other technologies.

Job Duties:
Gather and analyze system and user requirements
Prioritize work based on elicited system and user requirements
Design, develop, test, deploy, and support .NET applications
Develop new applications using C#, ASP.NET Core MVC, Web API, Windows Forms, SQL Server, SSRS, SSIS, and other technologies
Rewrite legacy applications as modern .NET applications
Develop ASP.NET MVC applications using ADO.NET
Develop ASP.NET applications using C#
Design and develop SQL Server databases
Optimize SQL queries
Create and maintain database tables, views, stored procedures, and functions
Develop web applications using .NET Framework 4.0 or higher
Develop and secure Windows Communication Foundation services within a Service Oriented Architecture
Develop and deploy applications within N-tier environments
Manage code repositories, code promotion, and recovery strategies using TFS
Develop applications using Entity Framework 4.0 or later
Develop reports using SSRS and SSIS
Make SSRS and SSIS reports accessible within MVC web applications
Develop projects using Agile methodology with TFS or DevOps
Develop applications using Visual Studio including Visual Studio 2019
Use TFS or Azure DevOps including Git, Boards, and CI/CD pipelines
Develop and integrate REST APIs
Implement AJAX-enabled controls within ASP.NET web applications
Collaborate with the IT supervisor, project managers, developers, business resources, and functional resources
Facilitate meetings and work sessions
Manage assigned time and resources to meet project deadlines
Work independently and collaboratively as part of a team
Provide technical guidance and mentoring to technical staff
Ensure new applications comply with applicable coding standards

• **Only those lawfully authorized to work in the designated country associated with the position will be considered.**

• **Please note that all Position start dates and duration are estimates and may be reduced or lengthened based upon a client's business needs and requirements.**

Benefits:
For information and details on employment benefits offered with this position, please visit here. Should you have any questions/concerns, please contact our HR Department via our secure website.

California Pay Equity:
For information and details on pay equity laws in California, please visit the State of California Department of Industrial Relations' website here.

Rose International is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, age, sex, sexual orientation, gender (expression or identity), national origin, arrest and conviction records, disability, veteran status or any other characteristic protected by law. Positions located in San Francisco and Los Angeles, California will be administered in accordance with their respective Fair Chance Ordinances.

If you need assistance in completing this application, or during any phase of the application, interview, hiring, or employment process, whether due to a disability or otherwise, please contact our HR Department.

Rose International has an official agreement (ID #132522), effective June 30, 2008, with the U.S. Department of Homeland Security, U.S. Citizenship and Immigration Services, Employment Verification Program (E-Verify). (Posting required by OCGA 13/10-91.).