Sun un meșter, pentru că avem nevoie de o reparație rapidă.

No. They are two different words:

• sun = I call / I ring (from a suna)
• sunt = I am (from a fi)

So Sun un meșter means I’m calling a handyman, not I am a handyman.

This is a very important difference for learners, because the forms look very similar.

Romanian often leaves out subject pronouns when the verb form already makes the subject clear.

• sun already shows 1st person singular = I
• so (Eu) sun un meșter is possible, but eu is usually unnecessary

Romanian does this much more often than English.

Meșter can mean several related things, such as:

• craftsman
• skilled worker
• repairman
• handyman

In this sentence, because of o reparație rapidă, the most natural meaning is something like handyman or repairman.

Un is the indefinite article, like a/an in English.

So:

• un meșter = a handyman
• meșterul = the handyman

The sentence uses un meșter because the speaker is not referring to a specific, already identified handyman.

This is about Romanian differential object marking.

With human direct objects, pe is often used when the person is specific or definite:

• Îl sun pe meșter. = I’m calling the handyman.

But with an indefinite object like un meșter, pe is often omitted:

• Sun un meșter. = I’m calling a handyman.

In everyday speech, you may also hear sun la un meșter, especially when the focus is on making a phone call to someone.

A avea nevoie de is a very common Romanian expression meaning to need.

Literally, it means something like:

• a avea = to have
• nevoie = need
• de = of

So avem nevoie de is literally we have need of, but in normal English you would translate it simply as we need.

Romanian also has the verb a necesita, but a avea nevoie de is much more common in everyday speech.

Because nevoie normally appears in the fixed expression a avea nevoie de.

So you say:

• am nevoie de ajutor = I need help
• avem nevoie de timp = we need time
• avem nevoie de o reparație rapidă = we need a quick repair

The de is part of the structure and should not be dropped.

Because the adjective has to agree with the noun in gender and number.

• reparație is feminine singular
• so the article is o
• and the adjective becomes rapidă

Compare:

• un serviciu rapid = a quick service
• o reparație rapidă = a quick repair

This is standard Romanian adjective agreement.

In Romanian, adjectives often come after the noun.

So:

• reparație rapidă literally = repair quick

This is normal Romanian word order. Some adjectives can appear before the noun for style, emphasis, or with slightly different nuance, but after the noun is the default pattern in many cases.

Pentru că means because.

It introduces the reason:

• Sun un meșter = main action
• pentru că avem nevoie de o reparație rapidă = explanation/reason

So the structure is:

I’m calling a handyman because we need a quick repair.

You may also see other Romanian words for because, such as fiindcă or deoarece, but pentru că is extremely common and neutral.