Learn Croatian: Tvrtka danas radi. - The company is working today.

Raditi is a regular -iti verb. To form the present tense, we drop the -ti from the infinitive. Since the subject is tvrtka (the company, which acts as a 'she/it'), we use the third-person singular ending, which for this verb group is just -i. That gives us radi.

The English translation says 'is working'. Does Croatian have a special tense for things happening right now?

No, Croatian only has one present tense. The verb radi covers both the simple present ('works') and the present continuous ('is working'). You can usually tell which one is meant from context words like danas (today).

How do you pronounce a word like tvrtka when the first four letters are consonants?

In Croatian, the letter r can act as a vowel when it is surrounded by other consonants. You pronounce it with a rolled or trilled sound, creating a syllable of its own. It sounds almost as if there is a tiny vowel before the r, roughly like 'tvert-ka'.

Can I change the word order and say Tvrtka radi danas?

Yes, word order in Croatian is very flexible. Moving the adverb danas (today) to the end of the sentence is completely correct and keeps the same basic meaning, though putting it before the verb as seen here is a very common and natural flow.