well your grass doesn't look dead.
does it look like hay up close? does it crack and crinkle when you step on it?
did the lawn guys mow too short? if you take a ruler and put it down, do you get 3inches of grass? if it's less than 3in of grass then they might have mowed off the "green" parts, and if it's too short it'll "stress out" the grass
ask them to mow it higher, basically what theyre doing is giving you a nice presentable razor shave, when you really should be going for a 5oclock shadow.
if you want a "greener" lawn you some iron in there, rather than buying a separate iron additive like ironite, just get 2 bags of stinky milorganite that has iron in it
it's organic and slow releasing and you don't have to worry about "burning" your grass by putting down the wrong amount.
if thats the size of your front lawn (small) you really don't need a push broadcast spreader and can just get by w/ a hand crank
if you wanna have a nice program to keep track of what to fertizle and when to fertile (maybe you want to weed and feed)
try the scott app