The phrase "are constantly employed" is correct and usable in written English.
It can be used to describe individuals or groups who are consistently engaged in work or a particular activity over a period of time.
Example: "The researchers are constantly employed in various projects to advance our understanding of climate change."
Alternatives: "are continually engaged" or "are always working."
From the 8th century onward, it was constantly employed in architectural decoration, being repeated, for example, on the walls of temples.
I spent my 20's lucky enough to be constantly employed, earning just about enough to pay my rent and keep myself well stocked with weetabix and cheap vodka.
"Nobody should kill animals all the time," she said, and she told me she had written much on the importance of rotating personnel, so that they would not be constantly employed in killing, bleeding, or driving.
At the age of 15, Monty, as everyone called him, made his Broadway debut and for the next decade was constantly employed there, usually playing handsome, sensitive sons, though with the possible exception of Thornton Wilder's The Skin of Our Teeth (directed in 1942 by Elia Kazan) none of the plays he appeared in entered the classic repertoire.
Between the time of his leaving school and his nineteenth year, he was constantly employed in the hardy avocation of a Western woodman, cutting down trees, splitting rails, and the like, and during the evening eagerly devoting the few hours until bed-time to such books as he could manage to procure".
The employed homeless are constantly juggling the demands of their two worlds.
Because the external and internal environments of cells are constantly changing, any design principle employed at this level must be robust to perturbations.
So search engines employ software, "spiders," that are constantly combing the Web, following links and indexing Web pages.
Although it is desirable to determine the reconstruction parameter that is optimal for every patient, nevertheless the same reconstruction parameter is generally and constantly employed in clinical treatment.
Groups are constantly being set against each other; old versus young; employed against unemployed; disabled against fit for work; Travellers against home owners; asylum seekers against UK citizens.
