There are people who have been hired even without Japanese ability. However, we can’t really say there are many of those kinds of positions. Within many Japanese companies, Japanese is the official language of communication and there aren’t many Japanese employees who make use of English. In addition, in the case of foreign affiliated firms, there is a tendency for Japanese branches, based as they are in Japan, to hire those with business level English and Japanese. But if you are an IT engineer then, judging from your technical ability, there are start-up and venture firms which can offer an English work environment. Naturally, it is convenient to have Japanese ability to handle life in Japan, but there are many opportunities for IT engineers.