The estimated average salary for a Principal Technical Support Engineer at NETSCOUT is €74,141 per year or €36 per hour, but some professionals have reported earning up to roughly €77,245 per year (90th percentile). The typical pay range is between €71,037 (25th percentile) and €77,245 (75th percentile) annually. This is based on 1 salaries submitted by NETSCOUT Principal Technical Support Engineer professionals on Glassdoor, as of Jun 2026.