.NET Developer - mid-to-senior

The Timberline Group; Overland (MO); On-site; USD 90,000 - 120,000; Full time

Job summary

The Timberline Group is seeking a mid-to-senior .NET Developer for an onsite contract role in St. Louis. You will work across the full Microsoft stack, including .NET, SQL Server, and ASP.NET, joining an established environment.

Dynamics GP experience is a strong plus but not required. Responsibilities include designing, building, and maintaining applications, tuning SQL Server, and collaborating with stakeholders to translate business needs into robust technical solutions.

Qualifications

• 5+ years of professional .NET development experience.
• Strong C# and ASP.NET (Web Forms and/or MVC).
• Solid SQL Server experience including T-SQL and stored procedures.
• Full SDLC experience from requirements to deployment.
• Strong communication with both technical and non-technical stakeholders.
• Available to work fully onsite in St. Louis, MO.

Responsibilities

• Design, develop, and maintain applications using .NET, C#, and ASP.NET.
• Build, optimize, and tune SQL Server databases; develop procedures and views.
• Support and enhance existing web apps and internal tools.
• Translate business requirements into clean, maintainable solutions.
• Troubleshoot and resolve production issues across the stack.
• Integrate with internal systems and third-party APIs as needed.
• Assist or extend Dynamics GP customizations, integrations, or reporting.

Skills

.NET development

C#

ASP.NET

SQL Server

Communication

Tools

Git/TFS/Azure DevOps

Job description

US Citizens or GC Holders only -Direct-Hire
Local candidates only
Onsite- 4-5 days per week

We're hiring a mid-to-senior .NET Developer for an onsite contract role in St. Louis. The right candidate is comfortable across the full Microsoft stack — .NET, SQL Server, and ASP.NET — and can plug into an existing environment and contribute quickly. Experience with Microsoft Dynamics GP (Great Plains) is a strong plus but not required.

Responsibilities:

• Design, develop, and maintain applications using .NET, C#, and ASP.NET
• Build, optimize, and tune SQL Server databases — T-SQL, stored procedures, views, performance tuning
• Support and enhance existing web applications and internal tools
• Translate business requirements into clean, maintainable technical solutions
• Troubleshoot, debug, and resolve production issues across the stack
• Integrate with internal systems and third-party APIs as needed
• Where applicable, support or extend Dynamics GP customizations, integrations, or reporting

Required:

• 5+ years of professional .NET development (.NET Framework and/or .NET Core)
• Strong C# and ASP.NET (Web Forms and/or MVC)
• Solid SQL Server experience — T-SQL, stored procedures, query optimization
• Full SDLC experience — requirements, design, development, testing, deployment
• Strong communication skills; comfortable with technical and non-technical stakeholders
• Able to work fully onsite in St. Louis, MO

Preferred:

• Microsoft Dynamics GP (Great Plains) — customizations, integrations, or reporting
• ASP.NET MVC, Web API, or .NET Core
• Front-end familiarity (JavaScript, jQuery, Bootstrap, Razor)
• Source control with Git, TFS, or Azure DevOps
• Reporting tools — SSRS, Crystal Reports, or Power BI