NC'ed for this as I might be a bit recognisable. I'm in a senior job but as it's public sector I'm not earning megabucks. The role is quite like DramaRamaLlama's but without the multinational element.
I'm a little bit further on - my DD is nearly nine now. I'm afraid the way we made it work was for DH to become a SAHD, so we don't have the complications of trying to manage two careers. I'm very conscious that this makes me an unhelpful role model in some ways for younger women in my organisation. I'm the first woman to do my job and the first person from a BAME background.
In practical terms, I'm more hands-on than the average man with a SAHW, but with a slightly ruthless edge of deciding how each thing is going to benefit me / DD. I drop off at school twice a week, because I want to recognise DD's friends. I organise playdates and answer party invitations, because if something happens to DH and I'm three hours from home on a visit, I want an assortment of numbers in my phone for people I could trust to look after her till I can get back to London. I have to make the effort to do that, because it's DH who's having most of the interactions at the school gate. Apart from things for DD, I don't do much domestically during the week - basically I put the bins out and unload the dishwasher.
I have two evenings a week, usually Mondays and Wednesdays, when I plan to work as late as I need to, and I crack through a lot of stuff on those two nights. The other days, I make the effort to walk out of the door by 6 pm. The place I work is hot on flexibility, and most of my team work flexibly in one way or another - some part-time, some regular working from home, everyone works ad hoc from home from time to time to sort out domestic stuff. However, I find it's easiest to do my job five days a week in the office, except at quiet times (basically Christmas and August), when I can do a bit from home. I'm also contactable all the time and regularly check email on my work phone. Most of the time I can keep weekends (from Friday evening till Sunday late afternoon) for DH and DD.
I have a voluntary commitment for a couple of hours a week, and normally make time to get to a couple of exercise classes over the weekend (weekdays are hopeless). There was a stage when I got up early and did exercise DVDs before getting DD up for school, but I couldn't sustain that long-term: I need my sleep too much. My social life is a bit patchy but still in existence.
I think it works pretty well, and I can see that we could make it work with both of us working too provided that DH could work out a schedule similar to mine but with different late nights. However, it would need brilliant home support - probably at this stage a nanny/housekeeper who was also willing to take on chivvying DD to do homework and music practice and feeding friends who come round to play, plus a string of babysitters. In the earlier years we would have been looking at nursery and an au pair, or a nanny and some back-up care of some kind. We don't have any family help.
I don't have any advice that other people haven't already given, but I do want to say that there were times in the baby and toddler years when I was struggling with too much work on very broken sleep (in my previous job, which ironically was more junior but also more stressful than my present one), and was really tempted to take a step back. I'm so glad now that I didn't, and that I went for my present job when I did (DD was five when I applied), even though it was aiming very high and I didn't quite know what I was taking on. I expect the teen years will present their own challenges, but at least I'll be settled in a place where I'm comfortable and established at the point when they hit, and then I'll be looking for the final job of my career once she's done GCSEs.