Ŝi volas partatempan postenon.

Because it is the direct object of volas.

In Esperanto, the direct object usually takes the ending -n. Here:

• Ŝi = she
• volas = wants
• postenon = a position/job

So postenon is the thing she wants, which is why it gets -n.

A very literal breakdown is:

• Ŝi volas postenon = She wants a job/position.

Because adjectives in Esperanto agree with the nouns they describe.

• postenon is singular and has -n
• so the adjective describing it must match:
  • partatempa → partatempan

This is called adjective agreement.

So:

• partatempa posteno = a part-time position
• partatempan postenon = a part-time position (as a direct object)

Both words match:

• singular
• adjective + noun
• accusative -n

It breaks down like this:

• Ŝi = subject pronoun, she
• volas = verb, wants
• partatempan = adjective, part-time
• postenon = noun, position/job

So the structure is:

subject + verb + adjective + noun

More literally:

She wants a part-time position.

In Esperanto, all present-tense verbs end in -as.

So:

• voli = to want
• volas = wants / is wanting

This ending does not change with the subject. So:

• mi volas = I want
• vi volas = you want
• ŝi volas = she wants
• ili volas = they want

Unlike English, Esperanto verbs do not have different present-tense forms like want vs wants.

It is built from:

• parto = part
• tempo = time
• -a = adjective ending

Together, partatempa means part-time.

Then because it describes a direct object noun, it becomes:

• partatempa → partatempan

Esperanto often forms compound words like this. Once you know the pieces, the meaning is usually very transparent.

Yes, you may also encounter duontempa for part-time, depending on context and style.

But partatempa is understandable and commonly formed in a very straightforward way from parto + tempo.

For a learner, the key point is that Esperanto often allows very logical compounds. If native speakers use a different preferred compound in some contexts, that does not make partatempa mysterious grammatically.

Esperanto has no indefinite article like English a/an.

So:

• posteno can mean a position or just position, depending on context.

Esperanto does have a definite article:

• la = the

So compare:

• Ŝi volas partatempan postenon. = She wants a part-time position.
• Ŝi volas la partatempan postenon. = She wants the part-time position.

Not exactly.

• posteno = a position, post, or job role
• laboro = work or labor

So posteno often refers more to a specific job position, while laboro can mean work in a broader sense.

Examples:

• Ŝi serĉas postenon. = She is looking for a position/job.
• Ŝi havas multe da laboro. = She has a lot of work.

In this sentence, postenon fits well because it refers to a job opening or employment position.

Ŝi is pronounced roughly like shee in English.

Details:

• ŝ sounds like English sh
• i sounds like ee

So:

• ŝi ≈ shee

Esperanto spelling is very regular, so ŝ always has that sh sound.

Yes, Esperanto word order is fairly flexible, mainly because the -n ending helps show what the object is.

The normal order here is:

• Ŝi volas partatempan postenon.

But other orders are possible for emphasis, such as:

• Partatempan postenon ŝi volas.

That still means essentially the same thing, because postenon still has -n, marking it as the object.

For learners, though, it is best to stick with the standard order: subject + verb + object

Esperanto normally requires an explicit subject, just like English does in sentences like She wants...

So:

• Ŝi = she

You could replace it with a name:

• Maria volas partatempan postenon.

But you usually would not leave the subject out in a normal statement.

By itself, it usually means a part-time job/position in general, not a specific one.

That is because there is no la.

• partatempan postenon = a part-time position
• la partatempan postenon = the part-time position

So this sentence most naturally suggests that she wants some part-time position, not a particular already-identified one.