After graduating, he was in active service during the Battle of Keresztes in October 1596, and held the position of grand vizier under Sultan Mehmed III until his death in 1601.
But due to his absence from the capital and with Sokollu Mehmed Pasha dead, his influence waned for the rest of the reign of Murad III.
Rather than dashing toward immediate action, he distinguished himself as an orderly, methodical, and prudent statesman who preferred to start by conducting a review of the entire Ottoman administrative system based on the focal point of the prepared campaign against Austria.
The campaign as such proved a success and the Ibrahim Pasha acquired the title of "the conqueror of Eger" (north-east of Budapest) for his sultan, although he was the one who held the effective command.
He started his campaign by feigning to menace Vienna directly by heading toward Esztergom (conquered by Suleiman the Magnificent in 1543 and lost back in 1595) but finally spent the winter in Belgrade.