Pros
Unlike many companies that claim "possibilities of career development" but you end up stuck to a chair, Akamai *really* gives chance to develop your "career path". There is possibility of changing position and/or team within the company if you're interested in going forward with what you do, team managers are open to talk about it, and so on. Sure, you must be a good employee to get a chance. AFAIK, salary in Krakow is quite competitive. Office is generally nice, but be prepared for open-spaces. Even though Akamai is international corporation employee is not bothered with too many procedures and bureaucracy, however this strongly depends on division employee work in. Nice atmosphere among people, and what's important, good and mostly friendly relationships with managers.
Cons
It is still corporation, not a small company, so there ARE some procedures and some stiffness, not everything is a matter of talking to somebody. Some things just cannot be changed. Salary ranges are defined for a position, so be aware what position you're applying for. Hard to park a car around Krakow office. ;-)