C# Developer

GCS Recruitment; Jacksonville (FL); On-site; USD 80,000 - 120,000; Full time

Job summary

GCS Recruitment in Jacksonville, Florida is seeking skilled .NET Engineers to modernize legacy systems by migrating existing VB6 and VB.NET applications to a .NET C# WPF environment. You will lead this crucial migration, focusing on enhancing speed and quality using AI-powered tools.

The ideal candidate will have strong experience with C#, the .NET ecosystem, and familiarity with WPF. This role offers a chance to work under tight timelines and contribute to significant project outcomes.

Qualifications

• 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.

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.

Skills

C#

.NET ecosystem

Legacy systems (VB6, VB.NET)

WPF application development

AI-assisted development tools

Code refactoring

Modernization strategies

Working under tight timelines

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