Ta kandydatka dobrze mówi po polsku i po angielsku, więc chyba dostanie tę pracę.

Because ta and tę are different forms of the same demonstrative word, meaning this.

• ta kandydatka = this candidate
  Here, kandydatka is the subject, so it stays in the nominative case.
• tę pracę = this job
  Here, pracę is the direct object of dostanie (will get), so it goes into the accusative case.

For feminine singular nouns:

• nominative: ta
• accusative: tę

So the change is caused by grammar, not by meaning.

Kandydatka is the feminine form of candidate, while kandydat is the masculine form.

• ten kandydat = this male candidate
• ta kandydatka = this female candidate

Polish nouns usually show grammatical gender clearly, and adjectives/demonstratives have to agree with that gender.

Because dobrze is an adverb, and it modifies the verb mówi (speaks).

• dobry / dobra / dobre = good as an adjective, used with nouns
• dobrze = well, used with verbs

So:

• dobra kandydatka = a good candidate
• dobrze mówi = speaks well

In English, this is the same difference as good vs well.

This is just the standard Polish pattern for saying that someone speaks a language:

• mówić po polsku = to speak Polish
• mówić po angielsku = to speak English
• mówić po niemiecku = to speak German

So after mówić, Polish often uses po + language form.

This does not translate word-for-word into natural English, but it is the normal Polish structure.

They are special language forms used after po.

In practice, learners should treat them as fixed expressions:

• po polsku
• po angielsku
• po francusku
• po hiszpańsku

They come from adjectives such as:

• polski = Polish
• angielski = English

But in this construction, you should memorize them as part of the whole phrase po polsku, po angielsku, etc.

Because in Polish it is very natural to repeat the preposition before each item in a list.

So:

• po polsku i po angielsku = very natural
• po polsku i angielsku = sometimes understood, but less safe for a learner

If you are learning Polish, repeating po is the best habit here.

Więc means so, therefore, or thus.

It connects the two parts of the sentence:

• Ta kandydatka dobrze mówi po polsku i po angielsku
• więc chyba dostanie tę pracę

So the logic is:

She speaks Polish and English well, so she will probably get the job.

It introduces a result or conclusion.

Here, chyba means probably or I guess.

It shows that the speaker is not 100% certain. So:

• dostanie tę pracę = she will get this job
• chyba dostanie tę pracę = she will probably get this job

Depending on context, chyba can also sometimes sound like I think or apparently, but in this sentence probably is the best match.

Dostanie is the future form of the perfective verb dostać.

• dostać = to receive, get
• dostanie = she will get / she will receive

In Polish, many perfective verbs form the future with a single word, not with a separate word like will.

So:

• dostaje = she gets / is getting / usually gets
• dostanie = she will get

That is why dostanie tę pracę means she will get the job.

Because praca is the direct object of dostanie, so it must be in the accusative case.

• nominative: praca = work, job
• accusative: pracę = job, as the object

So:

• To jest praca. = This is a job.
• Dostanie pracę. = She will get a job.

This is a very common pattern in Polish: feminine nouns ending in -a often change to -ę in the accusative singular.

Yes. Polish word order is more flexible than English word order.

The sentence as given is very natural:

• Ta kandydatka dobrze mówi po polsku i po angielsku, więc chyba dostanie tę pracę.

But some parts could move for emphasis, for example:

• Ta kandydatka mówi dobrze po polsku i po angielsku...
• Chyba ta kandydatka dostanie tę pracę...

The meaning stays similar, but the emphasis changes slightly.

For learners, the original version is a very good neutral model.

Not exactly.

Dobrze mówi po polsku means she speaks Polish well. It tells us she speaks it competently, but it does not automatically mean full fluency.

If you want to say fluently, Polish often uses:

• mówi płynnie po polsku = she speaks Polish fluently

So dobrze is a bit broader and less specific than płynnie.

In Polish, stress is usually on the second-to-last syllable of each word.

So roughly:

• kan-dy-DAT-ka
• DO-brze
• MO-wi
• POL-sku
• an-GIEL-sku
• DOS-ta-nie
• PRA-cę

This regular stress pattern is one reason Polish pronunciation becomes easier once you know the rules.