Not good, actually poorest employer in my experience
Spark culture is management centered and you can expect little or no support. Employee surveys appear to get used against staff who don't rate Spark well.
The manager I had was a bully I thought, and left me unsupported on many occasions.
If you are thinking about working for Spark, I caution you, they pay poorly, and are very demanding and unpleasant.
Lomg hours, poor pay, arrogant managers