On-site C# & VB.NET Dev for Legacy Windows Apps

SydSen Recruit; Gauteng; On-site; ZAR 391,000 - 502,000; Full time

Job summary

SydSen Recruit is seeking a hands-on Software Developer to join a small in-house development team in Gauteng. The role focuses on maintaining and extending an existing business-critical environment built around C#, VB.NET, and Microsoft SQL Server.

You will work on maintaining Windows-based applications, diagnosing and resolving bugs, and developing new functionality within the current architecture. The team emphasizes stability, testing, and ongoing system modernisation.

Qualifications

• Solid C# development experience.
• Strong Microsoft SQL Server capability.
• Working knowledge of VB.NET.
• Experience maintaining or extending established / legacy applications.
• Strong debugging and troubleshooting ability.
• Familiarity with Git or other source-control systems.
• Comfortable working within a small development team.
• Strong focus on system stability and reliability.

Responsibilities

• Maintain and support existing Windows-based applications.
• Diagnose and resolve bugs in C# and VB.NET.
• Develop new functionality within an existing application architecture.
• Write and optimise SQL Server queries.
• Develop stored procedures, views and related database objects.
• Investigate and resolve user-reported system issues.
• Assist with testing and deployment.
• Refactor and improve legacy code.
• Maintain system stability and business continuity.
• Document technical changes.
• Work closely with the Senior Developer.
• Contribute to future system modernisation initiatives.

Skills

C# development

Microsoft SQL Server

VB.NET

Debugging

Git

Tools

Git

Job description

SydSen Recruit is seeking a hands-on Software Developer to join a small in-house development team in Gauteng. The role focuses on maintaining and extending an existing business-critical environment built around C#, VB.NET, and Microsoft SQL Server.

You will work on maintaining Windows-based applications, diagnosing and resolving bugs, and developing new functionality within the current architecture. The team emphasizes stability, testing, and ongoing system modernisation.