Când ajung la birou, deschid laptopul și caut fișierul în rețea pentru ședință.

Romanian often drops subject pronouns when the verb ending already makes the subject clear.

• ajung = I arrive / I get
• deschid = I open
• caut = I look for

So eu is not necessary. You could say Eu ajung la birou..., but that usually adds emphasis, like I get to the office.

Because Romanian uses the present tense for habitual actions and routines, just like English does in sentences such as When I get to the office, I open my laptop.

Here the sentence describes a regular sequence:

• Când ajung la birou = When I get to the office
• deschid laptopul = I open the laptop
• și caut fișierul = and I look for the file

So this is not necessarily happening right now; it is a usual routine.

Here ajung means I arrive or I get to.

In Romanian, a ajunge is very common for reaching a place:

• ajung acasă = I get home
• ajung la școală = I get to school
• ajung la birou = I get to the office

It can also have other meanings in other contexts, such as to be enough, but here it clearly means arrive/get to.

La birou usually means to the office or at the office/workplace, depending on context.

In this sentence, Când ajung la birou means When I get to the office.

Compare:

• la birou = at/to the office, at work
• în birou = in the office / inside the office room

So la birou is the natural choice for arriving at your workplace.
If you said în birou, it would sound more like entering the physical room itself.

That -ul is the definite article, which Romanian usually puts at the end of the noun.

• laptop = a laptop
• laptopul = the laptop
• fișier = a file
• fișierul = the file

So instead of putting a separate word like the before the noun, Romanian attaches it:

• deschid laptopul = I open the laptop
• caut fișierul = I look for the file

This is one of the biggest structural differences from English.

Because Când ajung la birou is an introductory subordinate clause.

Romanian usually separates this kind of opening time clause with a comma:

• Când ajung la birou, deschid laptopul...

This works much like English:

• When I get to the office, I open my laptop...

So the comma is standard and natural here.

Caut means I look for or I search for.

The basic verb is a căuta = to look for / to search for.

So:

• caut fișierul = I’m looking for the file / I search for the file

It does not mean that the speaker has found it already.
If you wanted I find the file, you would use a different verb, such as găsesc.

În rețea literally means in the network.

In this context, it most likely means the file is located on the company network, in the network, or somewhere in the shared system.

• rețea = network
• în rețea = in/on the network

Depending on context, English might translate this more naturally as on the network, even though Romanian uses în here.

Sometimes yes, but the nuance can shift.

• în rețea often suggests within the network/system
• pe rețea can sound more like on the network, especially in technical or informal usage

In many workplace/IT contexts, both may be understood, but în rețea is perfectly natural here. A learner should recognize that Romanian prepositions do not always match English ones exactly.

Because Romanian does not always use the definite article where English uses the.

Pentru ședință means for the meeting, but it leaves the noun indefinite in form. This can still be perfectly natural if the context already makes the meeting clear.

Compare:

• pentru ședință = for the meeting / for a meeting
• pentru ședința de azi = for today’s meeting
• pentru ședința cu directorul = for the meeting with the director

So ședință without the definite article is not wrong here. It sounds like the purpose is meeting-related, and the context probably identifies which meeting is meant.

Yes. Romanian word order is fairly flexible, although this version is very natural.

The original order is good because it presents the actions in a clear sequence:

1. Când ajung la birou
2. deschid laptopul
3. și caut fișierul în rețea pentru ședință

You could rearrange parts for emphasis, but the original is the most neutral and natural for a routine statement.

For example:

• Când ajung la birou, caut fișierul în rețea și deschid laptopul
  This is grammatical, but it changes the order of actions.

So yes, Romanian allows variation, but the original sentence is a standard, natural way to say it.