Arvada is just another suburb of Denver ...mostly houses and service type businesses. Don't limit your search to Arvada. Boulder is also within range and there is a large tech center just east of Boulder. There are some other little towns in Boulder county too that are easy to get to from Arvada.
You can get to north part of the Denver metro (Thorton and Northglenn) area and downtown Denver easily. Aurora is probably too far. Littleton, Centenial, the Denver Tech Center are doable but it's a frustrating drive unless you can get a job near C470. You can go West into the mountains as easy as you can go south to the southern part of the metro area.
Most people who work in the Denver area commute 30 to 60 mintues a day (distance is not as relevant as time). Arvada is centrally located near I-70, I-76, and Highway 36 (to Boulder) ..all three connect to I-25 which is one of the major north/south travel routes. C-470 will loop you around to the west. There are loops to the east but I rarely worked east except to say there is a toll road that works well to take you all the way across the metroplex by skirting the population.
There is a decent bus system and light rail in some places, but the Denver metro area is a region of commuters who mostly drive large SUVs and pickups. You'll want one of those just to be able to see around the others. The roads are clogged and I generally thought of driving as having two or three 'near death' experiences a week.
I'm sorry I can't tell you of any specific employers. Arvada is a decent place to live but most people work in a neighboring city or county. The old town area still has a few families that go back three generations, but since their family houses are small and old, they are being forced out by urban renewal groups who want density over decency, pavement over ponies.