The salary trajectory of a a Senior Software Engineer ranges between locations and employers. The salary starts at £54,686 per year (estimate) and goes up to £113,508 per year (estimate) for the highest level of seniority.
The estimated average salary for a Senior Software Engineer at Avaya is £75,530 per year or £36 per hour, but some professionals have reported earning up to roughly £140,350 per year (90th percentile). The typical pay range is between £57,721 (25th percentile) and £102,252 (75th percentile) annually. This is based on 4 salaries submitted by Avaya Senior Software Engineer professionals on Glassdoor, as of Jun 2026.