O setor em que minha mãe trabalha procura uma profissional eficiente para uma vaga remota.

Em que means in which or, more naturally in English, where.

The key point is that the verb trabalhar often appears with em when you say where someone works:

• trabalhar em um setor
• trabalhar em uma empresa

So when that location becomes part of a relative clause, the preposition stays:

• o setor em que minha mãe trabalha = the department where my mother works

Using only que would leave out the preposition that belongs with trabalha.

Yes, in everyday Brazilian Portuguese, onde is very common here:

• O setor onde minha mãe trabalha...

That sounds natural and is widely used.

However, em que is a bit more formal or careful, and some teachers prefer it, especially in writing. Both are useful to know:

• em que = slightly more formal
• onde = very common and natural in speech

In Brazilian Portuguese, family words with possessives can appear with or without the article:

• minha mãe
• a minha mãe

Both are correct.

In Brazil, dropping the article is very common, especially in neutral, standard phrasing. Adding the article can sound a little more conversational or regional, depending on the speaker.

So:

• minha mãe trabalha
• a minha mãe trabalha

Both mean the same thing.

Here setor usually means department, area, or sector within a company or organization.

So depending on context, O setor em que minha mãe trabalha could mean:

• The department where my mother works
• The division where my mother works
• The sector where my mother works

In workplace Portuguese, setor is a very common word for an internal department.

Because the simple present in Portuguese often covers meanings that English expresses with the present continuous.

So:

• procura literally looks like looks for
• but in context it often means is looking for

Here it means the department is currently seeking someone:

• procura uma profissional eficiente = is looking for an efficient professional

This is very normal in Portuguese.

Most likely, yes. Uma profissional is feminine singular, so it suggests the opening is for a female professional.

A useful detail: profissional is a common-gender noun, which means the noun itself does not change form. The article shows the gender:

• um profissional = a male professional
• uma profissional = a female professional

So the ending of the noun does not change, but the article does.

In real life, this choice may reflect:

• a specifically female candidate
• wording tied to the role or context
• or a style choice in the example

Because eficiente is an adjective with the same form for masculine and feminine.

So you get:

• um profissional eficiente
• uma profissional eficiente

Only number changes:

• profissional eficiente
• profissionais eficientes

Many Portuguese adjectives work like this. Not every adjective changes for gender.

Vaga here means job opening, vacancy, or position.

So uma vaga remota means:

• a remote position
• a remote opening
• a work-from-home vacancy

Why remota? Because it agrees with vaga, which is feminine:

• vaga remota
• trabalho remoto

Notice the adjective changes depending on the noun it describes.

Because em que minha mãe trabalha is a restrictive relative clause. It identifies which setor we are talking about.

The meaning is:

• the department where my mother works
  not
• the department, where my mother works, ...

In Portuguese, as in English, restrictive clauses normally do not take commas.

Yes. A few natural alternatives are:

• O setor onde minha mãe trabalha procura uma profissional eficiente para uma vaga remota.
• O setor da minha mãe está procurando uma profissional eficiente para uma vaga remota.

These change the style slightly:

• onde sounds a bit more everyday than em que
• está procurando makes the ongoing search more explicit

But the original sentence is fully natural and correct.

Here para means something like for in looking for someone for a remote position.

So the structure is:

• procurar alguém para uma vaga = to look for someone for a position

It shows the purpose or target of the search:

• they are looking for an efficient professional
• for a remote opening

So para uma vaga remota tells you what the person is being sought for.