Pros
Great positive culture, very welcoming to the bright, passionate, hard working people, who want to do something great and adore to work and hanging out together.
People enjoy the work at HH.ru. Most of them check email or work from home in evenings and go out with coworkers or just have drinks at the office after work.
Professional development is a great part of company's culture. HeadHunter offer variety of courses on things like presentation skills, sales, management skills and technical topic.
All the executives are easy going and kind people, in the same time very professional. Most of them built their career to the top within of the company. The company was growing quickly and still keep promoting people from within.
HeadHunter has high hiring standards both technical and attitude. Salaries are pretty high comparing to the average on the market.
Cons
Can't think of any cons. It's just ... if you are not willing to treat your job as an important part of your life, HeadHunter probably is not the company you want work for.