Senior C#/.NET Software Engineer — Modernization & APIs

Sanlam; Bellville; On-site; ZAR 900,000 - 1,300,000; Full time

Job summary

Sanlam is seeking a Senior C# Developer to modernize legacy C++ engines into scalable C#/.NET services and APIs. You will lead design through deployment, mentor junior developers, and ensure robust testing and documentation.

You will collaborate across project, BAU, architecture, testing, and operations teams, with AWS and cloud experience a plus. A strong emphasis on quality, observability, and responsible use of AI tools is required.

Qualifications

• Minimum 7 years’ hands-on experience in C#/.NET development within enterprise environments.
• Experience in application modernization, legacy rewrites, migration, and/or re-platforming initiatives.
• Experience with automated testing, CI/CD pipelines, and GitHub.

Responsibilities

• Partner with project, BAU, architecture, testing, and operations teams to deliver reliable and maintainable solutions from design through deployment.
• Analyze legacy C++ calculation engines, business rules, integrations, and data flows to support modernization initiatives.
• Translate complex business requirements into scalable, testable, and maintainable C#/.NET services and APIs.
• Own and manage source code repositories using GitHub and DevOps best practices.
• Provide technical recommendations, effort estimates, and solution design input.
• Design, build, test, and support high-quality software solutions and integrations.
• Implement automated testing approaches including unit, integration, regression, and comparison testing.
• Troubleshoot incidents, perform root cause analysis, and implement preventative improvements.
• Maintain solution, deployment, system, interface, and data model documentation.
• Mentor junior and intermediate developers and contribute to engineering standards.
• Use AI-assisted development tools responsibly to accelerate analysis, testing, documentation, and delivery.
• Provide production support and standby assistance where required.

Skills

C#/.NET development

Cloud experience

Analytical thinking

Team collaboration

Education

Qualification in Computer Science / IT / Software Engineering / Information Systems

Tools

GitHub

CI/CD pipelines

AWS

Job description

Sanlam is seeking a Senior C# Developer to modernize legacy C++ engines into scalable C#/.NET services and APIs. You will lead design through deployment, mentor junior developers, and ensure robust testing and documentation.

You will collaborate across project, BAU, architecture, testing, and operations teams, with AWS and cloud experience a plus. A strong emphasis on quality, observability, and responsible use of AI tools is required.