It is difficult to judge whether the spark thinking is reliable in Changsha, because it depends on the specific employer and work content. However, Spark Thinking is a well-known online education company in China, which has a huge user base and brand awareness in China. If you are interested in the position of Spark Thinking, I suggest you know the background and evaluation of the company in advance, and negotiate with your employer about the job content and salary before making a decision.