Sparkloop is a dishonest and unprofessional company that deceives people and doesn't pay them. I wasn't compensated for the test assignment, which was clearly described as paid in the job listing. The founder stopped responding. I only received a response (in a month) when I scheduled a call with him. He replied that the test assignment was unpaid, only the subsequent one would be. The hiring process clearly states that there is only one test assignment, which is what I completed.
I wouldn't trust people who deceive potential employees. I don't recommend it.