I am a native speaker and qualified teacher with many years of experience teaching predominantly adult learners of English, mostly in a university setting (Hamburg University), but also on a private basis.
Your project description is not very clear concerning the amount of time. In it you say 30 minutes a day for 4 days a week, which would total 2 hours a week, but you also say 8 hours a week. Could you clarify that please? 2 hours a week is doable, but 8 hours a week (2 hours a day) may be too much when I am busy with my other work.
My bid is based on the assumption that we would do a trial of two half-hour sessions to see if we are compatible and to be sure that it is practical, for instance, we would need to clarify whether our time zones would match. I am based in Melbourne, Australia (GMT+9). In the first two trial sessions I would be able to assess your needs and you could ask me any questions that you may have. Then we could decide from there how to proceed.
All the best,
Catherine