Ako uspijem diplomirati do ljeta, tražit ću posao u Zagrebu ili u Rijeci.

After ako in Croatian, you normally do not use a future form. You use the present tense instead, just as English says If I manage..., not If I will manage....

Here, uspijem is the 1st person singular present of uspjeti (to manage / succeed). Because uspjeti is perfective, this present form naturally refers to a future completed result in this kind of clause.

It means I manage to graduate or I succeed in graduating. The verb uspjeti adds the idea that graduating is something the speaker hopes to accomplish, not just something that automatically happens.

So uspijem diplomirati is a bit stronger than simply saying diplomiram.

Because uspjeti is followed by an infinitive: uspjeti + infinitive.

So:

• uspijem diplomirati = I manage to graduate
• uspio sam naći = I managed to find

This is a very common Croatian pattern.

Usually diplomirati refers to graduating from a university or completing a degree. It is connected with getting a diploma.

For finishing school more generally, Croatian often uses other expressions such as završiti školu or, in some contexts, maturirati.

Do ljeta means by summer, until summer, or before summer depending on context.

The preposition do takes the genitive case, so ljeto becomes ljeta:

• nominative: ljeto
• genitive: ljeta

That is why it is do ljeta, not do ljeto.

It is the future tense of tražiti (to look for / seek).

Croatian future is formed with the verb htjeti as an auxiliary:

• ću tražiti
• tražit ću

When the auxiliary comes after an infinitive ending in -ti, the final -i drops in writing:

• tražiti + ću → tražit ću

This is standard Croatian spelling.

Yes, tražiti can mean both to look for / seek and to ask for / request. The context tells you which meaning is intended.

In tražiti posao, the natural meaning is to look for a job. If you said tražiti pomoć, that would usually mean to ask for help.

Here posao is the direct object of tražit ću, so it is in the accusative case. But for many masculine inanimate nouns, the accusative singular looks the same as the nominative.

So:

• nominative: posao
• accusative: posao

That is why the form does not visibly change.

Because u here means in, so it takes the locative case for location.

The two city names decline differently:

• Zagreb → u Zagrebu
• Rijeka → u Rijeci

With Rijeka, the stem also changes a little: k becomes c before the ending, which is a normal sound change in Croatian declension.

Not in this sentence. U Zagreb and u Rijeku would suggest movement into those cities.

Here the meaning is looking for a job in Zagreb / in Rijeka, so the activity is located there, which is why Croatian uses the locative:

• u Zagrebu
• u Rijeci

Croatian often repeats the preposition with each item in a list:

• u Zagrebu ili u Rijeci

This sounds clear and natural. You may sometimes hear u Zagrebu ili Rijeci, but repeating u is very common and stylistically safer for learners.

Because Ako uspijem diplomirati do ljeta is a subordinate conditional clause, and it is separated from the main clause with a comma.

So the structure is:

• condition: Ako uspijem diplomirati do ljeta,
• result: tražit ću posao...

This is standard Croatian punctuation.

The word order here is natural and neutral, but Croatian word order is fairly flexible.

For example, you could also say:

• Ako uspijem diplomirati do ljeta, posao ću tražiti u Zagrebu ili u Rijeci.

That version puts more focus on posao. But the original sentence is the most straightforward way to say it.

A few useful points:

• ć in ću is a soft sound, somewhat like a very мягкий ch/t sound, but not exactly English ch.
• tražit ću is pronounced roughly as TRAH-zhit-choo, though English spelling cannot show it perfectly.
• Rijeci is roughly REE-yeh-tsee.

The j in Croatian is like English y in yes, so Rijeka begins more like REE-ye- than RYE-.