我曾在一家证券公司工作一年，担任客户经理岗位，学到了很多东西。 用英语怎么说？ 不要百度翻译的，谢谢

I have worked in a security company as a customer manager and I have learnt a lot of things.

For a year, I have worked in a finance company as the director of customer service. This position allowed me to learn many things.
PS: (一般英语会说to acquire many skills 或者 to develop/improve specific abilities, 很少有人会说学到了很多东西。。。）

I worked for a year as a customer manager in a security company and learnt a lot there.

I worked in a securities company for one year, as a customer manager position, learned a lot of things