採購 can be both a verb and a noun (Verb) EX: 我們一起去採購吧! Let's go purchase (something) or shopping ! (Noun) EX: 我是採購。Usually refer to a position in a company. I am in charge of purchasing. (I work as a buyer, a purchasing agent). Hope it helps.

a short version of 我是采购员, quite informal, but acceptable.

采购 could be verb and noun. in this sentence is noun, is a person/position, is the purchaser. it also can be a verb, means purchase goods. eg: 我们今天要去采购一台机器。

I work as a purchaser. If you don't mind my asking if i say I work as a buyer, Would you understand what I mean?

In my company, I am a guy who in charged of purchasing.