Starduster

If I am asked to say what's my job,
I feel that words can hardly describe my job nature
But in reality,
it's just that my job is too complicated

At times, I would put on a safety helmet
to walk through the field under the torture of the blazing sun rays
like a construction foreman

I also donned on a business suit to give presentations
to stir awareness and interest among potential customers
like a businessperson

I would have to entertain clients
and bring them out for meals
like a salesperson

Like a marketing staff
recently I faced the difficulty of
writing a 5-year product plan

Sometimes, I would plan trials for products
and conduct trial assessments
like a research officer

I frequently have to wear my lab coat
and carry out some simple chemical tests
like a lab assistant

I also had the experience of
delivering products to customers
just like a deliveryman

Now, can you guess what's my occupation?
Precisely, what is my job title?