This is the 12620th most frequent Russian word.
контрактника
A "контрактника" is a contracted soldier or servicemember.
Here 'контрактник' means a person employed under a contract in a civilian job.
Он работает как контрактник в компании по разработке программного обеспечения.
He works as a contractor in a software development company.
In this case, 'контрактник' refers to a military professional serving on a contractual basis.
Мой брат — контрактник в армии и несёт службу за границей.
My brother is a contract soldier in the army and serves abroad.
Here 'контрактник' implies specialists engaged temporarily under contract for a specific task.