It has helped keep its labor turnover below 10% a year, versus 27% for the rest of the Indian technology sector.

FORBES: The softest pillow

The report, known as the Job Openings and Labor Turnover survey, or JOLTS, calculates total hiring, layoffs and quits.

NPR: US Employers Post More Jobs, Cut Fewer Workers

Ultimately, says Mr. Hallock, compensation is an inexact science, determined by labor-market conditions, company budgets and individual employees' performance and turnover risk.

WSJ: Workers Share Their Salary Secrets