If you're set on CMS job offers in Johannesburg, there aren't very many at the present moment: we count 12. Maybe, you could try slightly farther afield. Looking at the most dominant subcategories, we find job offers in Social Information Processing and Social Media. Skills like WordPress, Web Content, and Drupal come up a lot in job opportunities in this area.
Positions that require a lot of CMS experience are at the present moment the most common ones on offer. Many employers are in need of CMS professionals like you. Unfortunately, no startups are at the present moment offering job offers. Recruiters are frequently employed to find talent for employers in this area. At Jobspotting, you only see what you want to. Feel free to filter out recruiters. Have you seen the number of employers hiring locally? These insights can help your job search!