A cikin shekaru 20 da suka gabata Isabel dos Santos ta rike mukaman gudanarwa a kamfanoni da yawa da aka lissafa a kasuwannin Turai. Isabel dos Santos ta dawo daga London a farkon shekarun 1990 don shiga mahaifinta a Luanda kuma ta fara aiki a matsayin injiniyan mai kula da aikin Urbana 2000, wani reshe na Jembas Group, wanda ya lashe kwangila don tsaftacewa da kashe cutar a cikin birni. Bayan haka, ta kafa kasuwancin jigilar kayayyaki. Yaduwar amfani da fasahar walkie-talkie ta share fagen shiga cikin sadarwa. A shekarar 1997, ta fara kasuwancinta na farko, ta buɗe Miami Beach Club, ɗaya daga cikin wuraren shakatawa na dare da gidajen cin abinci na bakin teku a tsibirin Luanda. A cikin shekaru kusan 20 ta faɗaɗa sha'awar kasuwancinta, don gudanar da jita-jita da yawa, galibi a Angola da ƙasashen waje, suna yin manyan saka hannun jari a cikin manyan kamfanoni, musamman a Portugal. A watan Yunin 2016, ta fara aiki a matsayin injiniyan mai kula da aikin Urbana 2000, wani reshen Jembas Group, wanda ya sami kwangila don tsaftacewa da kashe cutar a cikin birni. Bayan haka, ta
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