We need to get a new office assistant on board as soon as Possible

We decided to bring Mike on board to join the marketing team

What does this mean on board？

Question

We need to get a new office assistant on board as soon as Possible

We decided to bring Mike on board to join the marketing team

What does this mean on board？

Answer

It’s another way of saying they hired Mike. It’s a reference to bringing someone on board a ship, so they come with you.

It’s the same as “We hired Mike” basically