Tôi vừa đợi bạn vừa đọc tin nhắn ở trước công ty.

In this sentence, vừa ... vừa ... means doing two things at the same time.

So:

• vừa đợi bạn
• vừa đọc tin nhắn

together means waiting for you while also reading messages.

A natural English equivalent is:

• while ...
• at the same time ...
• both ... and ... when the two actions happen simultaneously

It is repeated because this is a fixed Vietnamese pattern:

• vừa + action 1 + vừa + action 2

This pattern links two simultaneous actions.
If you only used one vừa, the sentence would not have the same structure or meaning.

So:

• Tôi vừa đợi bạn vừa đọc tin nhắn = I was waiting for you and reading messages at the same time

No, not in this sentence.

Vừa has more than one use in Vietnamese:

1. vừa ... vừa ... = doing two things at once
2. vừa mới or sometimes just vừa = just, a moment ago

Here it is clearly the first meaning because it appears as the pair vừa ... vừa ....

Compare:

• Tôi vừa ăn xong. = I just finished eating.
• Tôi vừa ăn vừa xem TV. = I ate while watching TV.

So in your sentence, vừa does not mean just.

Vietnamese often does not mark tense the way English does.
Instead, time is usually understood from:

• context
• time words
• the situation
• aspect markers if needed

So Tôi vừa đợi bạn vừa đọc tin nhắn ở trước công ty could mean:

• I waited for you while reading messages in front of the company
• I am waiting for you while reading messages in front of the company

depending on context.

If the speaker wanted to make the action clearly ongoing, they might use other wording or context. Vietnamese relies less on tense endings than English.

Because vừa ... vừa ... already does that job.

In English, you might say:

• I waited for you while reading messages
• I was both waiting for you and reading messages

In Vietnamese, the simultaneous meaning is built into the structure:

• vừa đợi bạn vừa đọc tin nhắn

So you do not need a separate word meaning while.

It means in front of the company.

Here:

• ở = at / in / located at
• trước = in front of / before
• công ty = company

Because trước comes with ở and a place noun, it is understood as a location, not time.

So:

• ở trước công ty = in front of the company

not:

• before the company in a time sense

Usually it is understood as the location of the whole situation: the speaker was in front of the company while doing both actions.

So the meaning is basically:

• I was in front of the company, waiting for you and reading messages at the same time.

In real conversation, Vietnamese often allows a phrase at the end to apply to the whole clause if that makes sense.

Here bạn means you.

In Vietnamese, pronouns depend a lot on relationship, age, and social context.
Bạn is commonly used for:

• a friend
• someone of similar age
• an informal but neutral you

So đợi bạn means wait for you in a friendly or fairly neutral way.

But in other situations, Vietnamese might use different words for you, such as:

• anh
• chị
• em
• cô
• chú
• ông
• bà

So bạn is not the only possible translation of you.

Vietnamese nouns usually do not change form for singular vs. plural.

So tin nhắn can mean:

• a message
• messages
• text messages

The exact meaning depends on context.

In this sentence, many learners would naturally understand it as messages or text messages, because that fits the situation well.

If the speaker wanted to be more explicit, they could add a quantity word, but it is often unnecessary.

Yes. You could also say:

• Tôi vừa đọc tin nhắn vừa đợi bạn ở trước công ty.

That still means the speaker was doing both actions at the same time.

The difference is mostly one of focus:

• vừa đợi bạn vừa đọc tin nhắn puts waiting for you first
• vừa đọc tin nhắn vừa đợi bạn puts reading messages first

Both are grammatically fine.

Yes, in many situations đợi and chờ both mean to wait.

So:

• đợi bạn
• chờ bạn

can both mean wait for you.

There can be small differences in tone or regional preference, but for most learners, they are very close in everyday use.

So your sentence could also be said as:

• Tôi vừa chờ bạn vừa đọc tin nhắn ở trước công ty.

It is understandable and grammatical, but depending on context, some speakers may prefer slightly smoother alternatives such as:

• trước công ty
• ở phía trước công ty

In casual speech, trước công ty is often enough.

Still, ở trước công ty is not wrong. A learner should understand it clearly as a location phrase meaning in front of the company.