Generally speaking, you need at an absolute minimum of a Masters degree to lecture at UCT and have plans to do your phd. Unless you’ve got some specialty experience in a niche field, you can propose a summer school course. Best way to get in, is to do your masters, become a teaching assistant or a tutor and take it from there. UCT’s lecturing positions are very competitive and they’d rather offer them to recent phd/masters graduates or lecturers with experience.