Avantages
Good work life balance. Good salary. Good stability. It's a large company so I can't generalize but depending on which business unit you're working in you can be working with helpful and experienced peers and managers.
Inconvénients
Amdocs' business model is based on acquisitions: So if you work in a company that gets acquired by Amdocs expect the following: 1- You will slowly but surely have your culture erased and replaced by the Amdocs culture. It's full of red tape and has many layers of bureaucracy. ETA until full culture erase is 3 year. 2- It's an Israeli based company so expect to have an irritating unprofessional army like upper management structure. 3- Only the flagship product will remain (reason for acquisition) all the other projects will be canned and the resources will be re-vectored to the flagship product. 4- If you're not in India, expect the R&D to slowly move to India. They will start by a small team in India and grow there. This will lead to a stop to any creativity and/or new product development, and to a slow move to an Indian heavy R&D organization through normal attrition. I recommend to calmly start looking for another job once the acquisition happens, unless you're comfortable with long term stagnation and the occasional unprofessional contact with people from other business units.