Eu vou chamar o técnico agora.

Yes. In Brazilian Portuguese, you can say either Eu vou chamar o técnico agora or simply Vou chamar o técnico agora.

The subject eu is often optional because vou already tells you the subject is I. Speakers include eu when they want to:

• add emphasis,
• make the subject extra clear,
• contrast with someone else.

So:

• Vou chamar o técnico agora = perfectly natural
• Eu vou chamar o técnico agora = also perfectly natural, often a bit more explicit

It is the very common ir + infinitive future structure.

Here:

• vou = I go / I am going from the verb ir
• chamar = to call

Together, vou chamar means I’m going to call or I will call.

This is one of the most common ways to talk about the future in Brazilian Portuguese, especially in everyday speech.

Yes, Chamarei o técnico agora is grammatically correct, but it sounds more formal, literary, or less conversational.

In everyday Brazilian Portuguese, people usually prefer:

• Vou chamar o técnico agora

rather than:

• Chamarei o técnico agora

So if you want natural spoken Brazilian Portuguese, vou chamar is the best choice.

Not always. Chamar is broader than English call.

Depending on context, chamar can mean:

• call someone over,
• summon someone,
• get someone,
• contact someone,
• call someone by a name.

In this sentence, Eu vou chamar o técnico agora, it often means something like:

• I’m going to call the technician
• I’m going to get the technician
• I’m going to contact the technician

If you specifically want to emphasize a phone call, Portuguese often uses:

• ligar para o técnico

So context tells you whether chamar is a phone call or more general contact/summoning.

O técnico means the technician, while um técnico means a technician.

Using o suggests a specific technician is already known from the situation or conversation. For example:

• the technician assigned to the job
• the repair technician for the building
• the tech person everyone already knows you mean

If you said um técnico, it would sound more like:

• any technician
• some technician, not a specific one

So the article changes how specific the noun is.

Because o técnico is the direct object of chamar.

The verb chamar normally takes a direct object without a preposition when it means to call/summon/contact someone.

So:

• chamar o técnico
• chamar a polícia
• chamar o gerente

By contrast, some verbs do need a preposition. For example:

• ligar para o técnico = to call the technician on the phone

That is why English speakers often confuse chamar o técnico with ligar para o técnico.

Agora usually means now.

In this sentence, it shows that the action will happen immediately or very soon:

• Eu vou chamar o técnico agora = I’m going to call the technician now

It does not have to stay at the end. Portuguese word order is flexible. You can also hear:

• Agora eu vou chamar o técnico
• Eu agora vou chamar o técnico

But the most neutral and common version here is:

• Eu vou chamar o técnico agora

Changing the position can slightly change the emphasis.

The written accent in técnico shows the stress goes on the first syllable:

• TÉC-ni-co

Without the accent, Portuguese stress rules would suggest a different pronunciation, so the accent is important.

A rough English-friendly guide:

• téc sounds somewhat like tech
• ni like nee
• co like koo or a light ko

So approximately: TECH-nee-koo

The accent mark does not just decorate the word; it tells you where the stress belongs.

Not always. Técnico can mean different things depending on context, such as:

• technician
• tech specialist
• repair person
• coach, in sports contexts

For example:

• o técnico do computador = the computer technician
• o técnico do time = the team coach

So in this sentence, the exact translation depends on the situation. If someone’s appliance is broken, o técnico probably means the technician or the repair person.

Yes. Portuguese allows some flexibility.

Possible versions include:

• Eu vou chamar o técnico agora
• Agora eu vou chamar o técnico
• O técnico eu vou chamar agora

But they do not all sound equally neutral.

The most natural basic order is:

• Eu vou chamar o técnico agora

If you move agora to the front, you emphasize now:

• Agora eu vou chamar o técnico

If you move o técnico to the front, it sounds more marked or contrastive:

• O técnico eu vou chamar agora
  as if contrasting with something else.

In standard grammar, you can replace o técnico with lo:

• Eu vou chamá-lo agora

What happens here:

• chamar + o becomes chamá-lo
• the infinitive gets an accent because the stress changes

However, in everyday spoken Brazilian Portuguese, many speakers prefer structures like:

• Eu vou chamar ele agora

Even though traditional grammar often prefers chamá-lo, the version with ele is extremely common in speech.

So:

• vou chamá-lo agora = more formal or more standard-written
• vou chamar ele agora = very common in spoken Brazilian Portuguese

This is a very useful distinction.

• chamar o técnico = call/summon/get/contact the technician
• ligar para o técnico = call the technician on the phone

So if your intended meaning is specifically a phone call, ligar para is more precise.

If your intended meaning is broader, like I’ll get the technician or I’ll call him over, then chamar works well.

In real life, context often makes the meaning clear.