In general, the salary of a big data engineer tends to be higher than that of a software tester. Big data engineers possess specialized skills in managing and processing large datasets, which are in high demand due to the growing importance of big data in various industries. However, specific salary differences may vary based on factors such as experience, location, and the company's size and industry.
If you are interested in getting into this field, then do check out this Preethi’s video about how she became a big data engineer just after completing of Advanced Certification in Data Science and AI.