Pros
I worked in the Glasgow office (Emergent Technologies). Great employer, flexitime, company shares scheme, pension, paid overtime, etc. Best of all, they're flexible about working from home, this is a great place to work if you have kids. If you don't have family, though, you can still WFH regularly too. Excellent place to improve your CV, their policy is to keep abreast of the latest technologies. If you're in between projects you're often tasked to investigate some new tool, language etc. which can be a lot of fun. They pay to send you on training courses too, and not the generic company-team-building PR stuff either, real courses on the specific area of technology you will be working on. Generally they leave you to it as well, they're Agile fans so you'll have daily stand-ups etc but there's no micro-managing. No blame culture either.
Cons
The parent company, CGI, is massive and is as bureaucratic and resistant to change as all such big institutions are. They force a large amount of unnecessary (online) paperwork onto the Glasgow office, online training, internal CVs and skill matrices, etc. You can lose hours just trying to fulfil the latest barmy request and you'll never need any of it. Also as many of their customers are government agencies the amount of paperwork you may be required to do for a security clearance to start on a new project can be insane. Overtime is a rare thing (usually only at the end of a project) and is usually (but not automatically) paid, but you often don't get much notice (sometimes you find out the same day that you're expected to work overtime that evening). This is not common and there's usually some kind of compensation for it above the merely financial (e.g. WFH for a week instead of your normal 2 days) so it's by no means a major negative to working there. The Glasgow office is a massively open-plan layout, with typically over a hundred people in the office at any given time, so noise levels can be an issue. If you're on the autistic spectrum at all and open plan can make you uncomfortable, then this won't be a good working environment for you (it's *extremely* open plan). Also the Glasgow office is run by an extrovert who likes to find spurious reasons to have meetings, demonstrations, etc and likes his employees to do the same. If you have an introverted personality type you will feel at a disadvantage compared to your more extroverted counterparts when working here. The management are all good people, though, and you *can* talk to them about any issues you have.