Life in Luanda
Suggest you visit Angola/Loo-loos before committing to work there.
I had occasion to make few shortish visits about 2 years ago & I found I really had to make some adjustments to my mindset - acceptance of such a run down place, unreliable water, sewage & electricity, mind numbing bureaucracy & inefficiency, traffic chaos & deadly roads, incredibly high cost of residential accommodation etc etc.
I know it is easy to whine about conditions in Africa but ones own attitude is a very important factor. I accept that with all my whining, there are plenty of "first world" people in Angola who are coping just fine because they had a better attitude than mine. I also accept that if you are working for the US based oil companies you may be sheilded from the frustrations of daily life in Angola.
The happeist place that I have seen on the planet earth? The International departures lounge at LooLoos airport!
Good luck with your plans