If you're not self-motivated and organized one could get buried under the heavy work load. Also the degree of managerial oversight varies depending on your role, which is a pro or con depending on personal preference (definitely a good thing to inquire about in an interview). Spark's company culture is young and fun, but employees are expected to carry their own weight and workload is strenuous and deadline driven. All that being said, work/life balance is significantly better than companies based in Manhattan.