I understand your situation, I had the same with Harley. I was with him from 8 weeks to 9 months before I got a job. Anyway, it turns out that the time I put in with him during that time was valuable in his growing up (he is not 14 months).
Anyway, now I am employed I cannot make it home during the day to see him. My arrangement is as follows for 3 days (Partner is home Thur & Fri):
0630 - take him out for little walk
1200 - hired dog walker comes in to take him and a gang of other dogs out for 1 to 1.5 hour (he loves this)
1930 - take him out for a walk and play
Ohh and during the day I leave plenty of toys and stuffed Kongs. This seems to keep him amused, he has not been destructive as yet.
Of course lots of love and affection when I get in at night.
I know that certain situations will require different methods, but this seems to work for me and Harley.
Hope this helped.