There are better tech companies out there . Better than those you just named. Just because they are not popular and you don't know them does not make them bad. If I call the company I work with you have never heard the name and I am sure you have used our services
There are 2 types of Nigerian tech companies.
The top 5% like Paystack, Andela, Cowrywise, Piggyvest. Top culture, Top career growth.
The remaining 95% are extremely bad for your mental health and career. Worst interviews, poor salaries, zero growth.
Avoid the 95% at all cost