Well done. I like it, especially the small details like the spinning gears. The font is nice to the eyes and easy to read.
I would spread the case study navigation over the whole page, they look too close to each other. In the career page, perhaps you can set the white line to close with the words on the left side? So it adjusts to the C? The career button toggles too much and changes the width when clicked. Can you set this to a fixed width? Same with the contact button.
On important issue: Do not use any effects on buttons, which you want actions to take place, which change the position of the button. E.g. if I want to click on learn more and the button jumps away from my mouse pointer it creates an uneasy feeling. Stay with the rotating gears etc. but keep the button fixed to one place. Some people just will not click them.
Again, well done in my opinion!