Depends what skills you have and how hot your market is. I know some people in big metro areas like London or Bucharest switching every year without problem as their skills are in high demand.
Anyone switching after an year means they barely made it after the six months probation time, so many employers will think twice about hiring them, unless they are in pressure to hire someone.
Also, unlike UK/US, they have this nasty habbit of not mentioning their salary range/hiring budget in job ads to low ball you during negotiations.
80K is pocket change compared to what they would have to pay in their home markets for experienced devs.