Vantaggi
I worked in Scytl for several years. If you are interested in electoral systems or security concerns then you will find working at Scytl interesting. Most of the software engineers are good and try to do things in the right way (even if they didn't always have the time to do that). The people working in Scytl are generally committed, professional and of a high standard. There was normally a good atmosphere in the company, and good relationships between people in different departments.
Svantaggi
The company initially grew rapidly, but seems to have contracted in recent years, and can't seem to make it to the next level. The company has a hard task to convince countries and organisations that it is 100% safe to use its software. Personally, I think it's software is probably the most sophisticated electoral software around, but there are many people (mostly academic researchers) who try to find anything to criticize (because they essentially think that any form of electronic voting is unsafe). There is a relatively high turnover of employees. Many very experienced people have left in recent years, which must have hurt the company a bit. Because any company that loses most of its experienced people can make the same mistakes that it made in the past. Occasionally the company goes through periods of intense pressure, and often many people (project mangers, software engineers, etc) leave after those periods, because they get burned out. If you stay for more than 3 years, you will be a veteran.