Senior Full Stack .NET Developer
Job Overview
iOCO is hiring a Senior Full Stack Developer (ref iOCO0197) in Johannesburg on a permanent basis to design, build and maintain high-quality, secure and scalable web applications across the full stack, from database and back-end services to modern front-end interfaces.
The role spans C#/.NET Core back-ends, Angular or React front-ends and SQL Server, modernises legacy applications onto modern .NET, applies AI-assisted development and LLM integrations, and leads, mentors and coaches other developers across the full SDLC.
Key Responsibilities
Translate business and technical requirements into designs across front-end, back-end and database layers
Develop web applications using C#, ASP.NET MVC and .NET Core
Build responsive UIs with HTML, CSS, JavaScript/TypeScript and modern frameworks
Design, build and consume RESTful APIs and third-party integrations
Write efficient T-SQL and tune SQL Server performance
Modernise legacy applications onto modern .NET
Apply AI-assisted development and AI/LLM service integrations
Execute the SDLC: code reviews, testing, security, CI/CD and architecture adherence
Lead, mentor and coach developers and drive coding standards
Investigate production issues and drive root-cause fixes
Required Qualifications
Bachelor's degree (NQF 7+) in Computer Science, IT, Software Engineering or related field
8+ years in software development, including 5+ years full stack web development
4+ years delivering projects as senior or lead developer
Strong C#, ASP.NET MVC, .NET Core (.NET 6+), Web API and Entity Framework
Angular or React plus strong SQL Server skills
Git, CI/CD (e.g. Azure DevOps), automated testing and Agile/Scrum; Azure/AWS and AI experience advantageous
Skills & Requirements
About This Job
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