This is the 18077th most frequent Russian word.
хакерской
"Хакерской" means "hacker's" or "related to hackers."
In this sentence, 'хакерской' is used as an adjective describing the type of conference, specifically one related to hackers or hacking.
Она участвовала в хакерской конференции, чтобы представить новый проект.
She participated in the hacker conference to present a new project.
Here, 'хакерской' modifies 'работы,' describing the professional activity or work related to hacking.
У него отличные навыки хакерской работы, которые помогли ему защитить систему.
He has excellent hacker skills that helped him secure the system.
In this example, 'хакерской' qualifies 'аудитории,' indicating the intended audience, namely those interested in or proficient in hacking.