The estimated average salary for a Agent Customer Service Representative at Firstsource Solutions is £47,283 per year or £23 per hour, but some professionals have reported earning up to roughly £68,519 per year (90th percentile). The typical pay range is between £39,309 (25th percentile) and £57,602 (75th percentile) annually. This is based on 247 salaries submitted by Firstsource Solutions Agent Customer Service Representative professionals on Glassdoor, as of Jul 2026.