Pros
Good salaries. The every alternate Friday off sounds like a good thing if you are able to stay for an hour extra each day to make up for it. Great pension options, private medical and discount vouchers.
Kontras
Integrity is one of the three buzzwords on how it conducts business, with excellence and respect being the other two. However, this means nothing in some of the projects. There are serious failures in Integrity. Do not trust any promise made/offered during the interview. Once you start work and remind them of their promises, be prepared for intimidation. If you complain, there is refusal to believe you and systematic "looking after each other's backs" by the "Old Boy's Club". Bullying, framing employees who they figure are "trouble" for them and false promises are all contradictions to the 3 buzzwords. If you will soon be interviewed, watch out for phrases like "We train our employees like no other company in the world", "Training is second to none" etc. You DEFINITELY WON'T be given the training you were promised. During the interview, if you are told you will be sent to the US for training feel free to laugh in their faces. You will be told in 1-2 months after joining that "plans have changed". By training they basically mean "death by nearly 3000 Powerpoint slides" from some one flown in across across the pond to read out loudly the lines from the slides, happily admitting they have very little knowledge about the product. Jobs are totally mis-sold. For instance, expect a Senior System Administrator job to actually just be first line support operator. If you have come from good technical backgrounds it may be a big shock and resentment may creep up on all the lies told to get you on the job because they are struggling to recruit. If you end up with a manager who has worked only within the MOD for 30 years before joining LM you should not be surprised that 95% of your own team in Lockheed Martin will be selected from ex-MOD, some of them close chums of the manager, who even openly claim to have Zero IT knowledge. There is extremely limited career progression in some of the projects you work. Working an extra hour a day to gain a extra Friday holiday every alternate weekend is neither here nor there, as you end up being shattered because of the extra hour at work each day, that after 2 weeks, you may end up needing 2 days off rather than 1 to recover from it.