This is the 3082nd most frequent Russian word.
исполнителем
"Исполнителем" means "performer" or "executor" in English.
This usage refers to a person performing music or art, highlighting the role of performing.
Он был исполнителем песни на концерте.
He was the performer of the song at the concert.
Here, the word is used to describe someone contracted to execute a specific task or project.
Компания наняла его исполнителем для нового проекта.
The company hired him as the contractor for the new project.
In this context, it signifies someone executing or carrying out a legal or formal process.