Senior Full Stack Developer (iOCO0197)

The purpose of the Senior Full Stack Developer role is to design, build and maintain high-quality, secure and scalable web applications across the full stack – from the database and back-end services through to the user interface – for Symplexity’s products and client solutions. The role drives technical excellence within the team through quality code, sound design and mentoring of other developers, in accordance with the prescribed architecture and standards, and delivers within the agreed timeframes. What you'll do: Analyse business and technical requirements and translate them into technical designs and working solutions across the front-end, back-end and database layers. Design, develop and maintain web applications using C#, ASP.NET, ASP.NET MVC and .NET Core. Build responsive, intuitive user interfaces using HTML, CSS, JavaScript/TypeScript and modern front-end frameworks. Design, build and consume RESTful APIs and integrate with internal and third-party systems. Write efficient SQL and design database objects in Microsoft SQL Server, including stored procedures, query optimisation and performance tuning. Extend, enhance and modernise existing applications to a defined scope and development timeline, including moving legacy code onto modern .NET. Identify and apply opportunities to use AI – such as AI-assisted development tools, AI/LLM service integrations and intelligent automation – to improve our products and the team’s productivity. Execute all elements of the Software Development Life Cycle (SDLC), including code reviews, unit and integration testing, security, CI/CD, environment maintenance and adherence to architecture. Lead, mentor and coach other developers, set realistic estimates and timelines, and drive coding and testing standards. Create and maintain technical documentation. Assist support as required, investigating production issues and driving root-cause fixes back through development. Your Expertise: Essential: Function related experience: Minimum of 8 years’ industry experience in software development, of which at least 5 years in full stack web development. Project experience: Minimum of 4 years’ experience delivering projects in a senior or lead developer capacity. Back-end: Strong hands-on experience in C#, ASP.NET, ASP.NET MVC and .NET Core (.NET 6 or later), including Web API and Entity Framework. Front-end: Solid experience with HTML5, CSS, JavaScript/TypeScript and at least one modern front-end framework (such as Angular or React). Database: Strong Microsoft SQL Server skills – T-SQL, stored procedures, data modelling and performance tuning. Engineering practice: RESTful API design, object-oriented design and design patterns, source control (Git), CI/CD pipelines (e.g. Azure DevOps), automated testing and Agile/Scrum delivery. Advantageous: AI experience: integrating AI/LLM services into applications (e.g. Azure OpenAI or other LLM APIs), prompt engineering, frameworks such as Semantic Kernel or ML.NET, and using AI-assisted development tools (e.g. GitHub Copilot) in day-to-day work. Cloud experience on Microsoft Azure and/or AWS. Experience modernising legacy applications (e.g. VB6, Web Forms) to modern .NET. Experience with HR, payroll or workforce management software. Qualifications: Essential Qualifications: Bachelor’s degree (NQF 7 or higher) in Computer Science, Information Technology, Software Engineering or a related field (e.g. BSc Computer Science, BTech/BEng, BCom Informatics) Preferred Qualifications: Honours degree in Computer Science or a related field Microsoft development certifications (e.g. Azure Developer Associate) AWS certifications Certification or recognised coursework in AI, machine learning or generative AI Other information applicable to the opportunity: Permanent position Location:Johannesburg Why work for us? Want to work for an organization that solves complex real-world problems with innovative software solutions? At iOCO, we believe anything is possible with modern technology, software, and development expertise. We are continuously pushing the boundaries of innovative solutions across multiple industries using an array of technologies. You will be part of a consultancy, working with some of the most knowledgeable minds in the industry on interesting solutions across different business domains. Our culture of continuous learning will ensure that you will have all the opportunities, tools, and support to hone and grow your craft. By joining IOCO you will have an open invitation to developer inspiring forums. A place where you will be able to connect and learn from and with your peers by sharing ideas, experiences, practices, and solutions. iOCO is an equal opportunity employer with an obligation to achieve its own unique EE objectives in the context of Employment Equity targets. Therefore, our employment strategy gives primary preference to previously disadvantaged individuals or groups.