What verb tense must I use in the following sentences? I'm describing my work experience in casual speech.
- I had been working at Apple for five years. [I imply that I worked there in the past]
- I've worked at Google for four years. [I imply that I've worked there till now]
- Now I'm unemployed and looking for a job at McDonald's.
Are these three sentences correct? Maybe in the first one I must use the past simple tense?