Ovlašteni projektant provjerava glavni projekt.

Ovlašteni means authorized, licensed, or certified, depending on context.

In technical, legal, or construction language, ovlašteni projektant usually means a designer/engineer/architect who is officially licensed to do that work.

It comes from ovlastiti = to authorize.
So ovlašten literally means authorized.

Because it agrees with projektant.

In Croatian, adjectives must match the noun in:

• gender
• number
• case

Here, projektant is:

• masculine
• singular
• nominative

So the adjective also appears in the masculine singular nominative form:

• ovlašteni projektant

This is the normal agreement pattern for adjectives before masculine singular nouns.

No, not usually.

Projektant is a person who designs something, especially in a technical, architectural, or engineering context. Depending on the field, it may be translated as:

• designer
• design engineer
• architect/designer
• planner

It is not normally project manager.
A project manager would more likely be something like voditelj projekta.

So in this sentence, projektant is the professional who prepares or works on the design documentation.

Provjerava is present tense, third person singular, from the verb provjeravati / provjeriti = to check / verify.

Here it means:

• he/she checks
• is checking
• checks regularly

Croatian present tense can cover several English ideas, depending on context:

• a general fact
• a habitual action
• something happening now

So provjerava could mean:

• checks
• is checking
• reviews

Because the verb is provjeravati, and its present-tense form is built as:

• ja provjeravam
• ti provjeravaš
• on/ona provjerava

So provjerava is simply the correct present-tense form for he/she.

Croatian verbs do not always form the present tense in a way that is easy to guess from English, so this is something you usually learn as part of the verb pattern.

It is in the accusative case, because it is the direct object of the verb provjerava.

The sentence structure is:

• Ovlašteni projektant = subject
• provjerava = verb
• glavni projekt = direct object

So the verb provjerava answers the question what is being checked?
Answer: glavni projekt

That makes glavni projekt accusative.

Because projekt is a masculine inanimate noun.

In Croatian, masculine inanimate nouns usually have:

• the same form in nominative
• and the same form in accusative

So:

• nominative: glavni projekt
• accusative: glavni projekt

Even though the form looks the same, the function is different:

• nominative = subject
• accusative = direct object

You can tell the case from the sentence structure and the role in the sentence.

Because glavni agrees with projekt.

Here, projekt is:

• masculine
• singular
• accusative

Since projekt is masculine inanimate, the accusative looks the same as the nominative, so the adjective also appears in the form glavni.

So:

• glavni projekt = masculine singular nominative/accusative form

If the noun were different, the adjective would change too. For example:

• glavna knjiga = feminine
• glavno rješenje = neuter

In everyday language, it could literally mean main project.

But in construction, architecture, and engineering, glavni projekt is often a fixed technical term. It refers to a specific set of design documents, often translated as:

• main design
• principal design
• detailed design documentation

So in this sentence, it is probably not just any main project in a general sense, but a technical/legal document or design package.

Because Croatian has no articles like English a and the.

So Croatian usually expresses definiteness from context instead of using articles.

That means:

• projektant can mean a designer or the designer
• glavni projekt can mean a main design or the main design

In real context, the meaning is usually clear from the situation.

Yes. Croatian word order is more flexible than English.

The neutral order here is:

• Ovlašteni projektant provjerava glavni projekt.

But you could also hear other orders for emphasis, such as:

• Glavni projekt provjerava ovlašteni projektant.
• Provjerava glavni projekt ovlašteni projektant.

These alternatives can sound more marked or stylistic, and they may shift emphasis:

• on who is doing it
• on what is being checked
• on the action itself

For a learner, the original order is the best neutral pattern to use first.

A simple approximate pronunciation for an English speaker is:

• Ovlašteni ≈ ov-LA-shte-nee
• projektant ≈ pro-yek-TANT
• provjerava ≈ pro-vye-RA-va
• glavni ≈ GLAHV-nee
• projekt ≈ PRO-yekt

A few helpful notes:

• j is pronounced like English y
• š is like sh
• je in provjerava sounds roughly like vye
• Croatian spelling is quite phonetic, so words are usually pronounced much as they are written

Yes, it sounds fairly formal and especially technical/professional.

Words like:

• ovlašteni
• projektant
• glavni projekt

are very common in legal, architectural, engineering, and administrative contexts.

In casual everyday speech, a Croatian speaker might choose simpler wording if the situation were not technical. But in professional documentation, this sentence sounds completely natural.