C# Developer

GCS Recruitment; Tallahassee (FL); On-site; USD 80,000 - 110,000; Full time

Job summary

GCS Recruitment is looking for skilled .NET Engineers in Tallahassee, Florida, to lead the migration of legacy applications to a modern .NET C# WPF environment. This role focuses on enhancing code quality and efficiency using AI-powered development tools.

The ideal candidates should have hands-on experience with C# and legacy systems, particularly in VB6 and VB.NET, and a strong understanding of application development practices. Prior experience with WPF is a must.

This position involves troubleshooting complex systems and designing robust test harnesses to ensure data integrity during the migration process.

Qualifications

• Strong hands-on experience with C# and the .NET ecosystem.
• Proven experience with legacy systems (VB6, VB.NET).
• Familiarity with WPF application development required.

Responsibilities

• Lead the migration of legacy VB6 and VB.NET applications to .NET C# WPF.
• Use AI-powered development tools to enhance speed and efficiency.
• Design and implement robust test harnesses.

Skills

C#

Legacy systems (VB6, VB.NET)

WPF application development

AI-assisted development tools

Code refactoring

Data integrity protocols

Tools

AI-powered tools (Codex, Claude Code)

Job description

We are seeking skilled .NET Engineers to join our team and play a critical role in modernizing legacy systems. The primary focus of this role is migrating existing VB6 and VB.NET applications to a modern .NET C# WPF environment within an accelerated delivery timeline.

Key Responsibilities

• Lead the migration of legacy VB6 and VB.NET applications to .NET C# WPF
• Use AI-powered development tools to enhance speed, efficiency, and code quality
• Contribute to an aggressive delivery roadmap targeting.
• Design and implement robust test harnesses to ensure correctness and stability
• Establish safety protocols to safeguard data integrity during migration
• Perform automated refactoring and support framework migration initiatives
• Troubleshoot complex legacy systems and resolve architectural challenges

Required Skills & Experience

• Strong hands-on experience with C# and the .NET ecosystem
• Proven experience working with legacy systems (e.g., VB6, VB.NET)
• Familiarity with WPF application development
• Experience using AI-assisted development tools such as Codex, or Claude Code, or Cursor or other similar tools
• Solid understanding of code refactoring, modernization, and migration strategies
• Ability to work under tight timelines and deliver high-quality results