Their stack of technologies fell behind by ages. Trust me, unless you hate your career, don't believe in their propaganda to hire. You'll be using the oldest possible version of the languages, application servers, frameworks and so on.
They've asked to upvote their status here on Glassdoor - which is unfair since the people are not sharing the reality.
The CEO is the example of how to not do the things: usually, he publicly humiliates some employees, calling them from mediocre in front of > 1500 people.
If you have > 10 years of experience in the market, you aren't a Senior Software Engineer for EDreams - the Senior is a title granted just to people who are more than 5 years doing jerry-rigs / kludges inside the company - you're just an outlander arriving to bring them problems.
Why using a standard library (to save time, avoid reinventing the wheel and use a bullet-proof solution)? No, let's create our home-made frameworks to everything from a Scheduler / Messaging system to date format conversion.
If you are a newcomer, don't dare to bring innovation: you don't have this right! By the way, it's feasible that some people will make fun of you behind your back (even if your suggestion adds value to the company).
During the official events, you'll hear things like: "Try to persuade a group of X people about your idea/technology adoption suggestion, then you bring these ideas to us, to be discussed" - forget too: If you do, you will listen to that: "we won't adopt this. It is vetoed because the chief architect doesn't like - with no further explanation".
People are used to sneakingly sabotage someone else plans. For example, an important guy (CTO, to be specific) is trying to implement an agile culture and change the way that the teams are distributed - their independence, etc. Behind his back, or even in front of him (as the poor guy is a foreigner), some team-leaders / architects are mocking the proposition all the time and clearly preventing it to occur (as they'd be useless if the plan was fully implemented).