Learn Portuguese (Portugal): O controlador já corrige a rota cuidadosamente. - The controller will correct the route carefully right away.

While já often means "already" for past actions, pairing it with a present tense verb like corrige is a common and natural way to express an immediate or guaranteed future action in Portuguese. In this pragmatic context, já corrige translates perfectly to "will correct right away" or "is about to correct".

Since the infinitive is corrigir, why doesn't corrige use a j like the "I" form (corrijo)?

In Portuguese, the letter g makes a soft sound (like the 's' in "measure") whenever it is followed by e or i. Because corrige has an e after the consonant, the g is kept to maintain the soft sound. The eu (I) form changes the spelling to a j (corrijo) simply because a g before an o would accidentally create a hard sound (like in "go").

Is the placement of cuidadosamente at the end of the sentence strict?

Generally, yes. Adverbs of manner—especially long ones ending in -mente like cuidadosamente (carefully)—typically follow the verb and its direct object (a rota). Putting it before the verb would sound very clunky and unnatural to a native speaker.