At the Office
Prepositions of Place, Similarity and Function
Use 'in' with countries, cities, towns and regions.
Example:
The shaping software was designed in Colorado.
He designed the clipboard application used in Australia.
Use 'at' for place in a city, town or village.
Example:
I'll launch this shareware program at the conference hall.
I'll design the new shell at the library.
Like and As
Use 'like' as a preposition to express that two are objects are similar in some characteristic.
Example:
That looks like a shortcut.
This painting of cyberspace looks like a set from the movie Tron.
Use 'as' to express the function that a person takes in an organization.
Example:
Tom works as a quality control representative that comments out code.
Richard works as a snail-mail carrier or as a mailman.