"which makes me feel more confident in front of strange people." Strange people: 古怪的人, 我想她指陌生人 (stranger)
這句的正確翻譯是﹕
During the past year with XXX Company, one of the greatest gains (最大的得著) is that I have acquired (獲得)/ learned (學到) interpersonal communication skills.
In the past one year, the great result from XX company is that I have learnt many communication skills , which makes me feel more confident in front of strange people.