The salary trajectory of a Senior Systems Engineer ranges between locations and employers. The salary starts at £38,404 per year (estimate) and goes up to £91,333 per year (estimate) for the highest level of seniority.
The estimated average salary for a Senior Systems Engineer at OneAdvanced is £186,564 per year or £90 per hour, but some professionals have reported earning up to roughly £271,900 per year (90th percentile). The typical pay range is between £154,834 (25th percentile) and £228,030 (75th percentile) annually. This is based on 17 salaries submitted by OneAdvanced Senior Systems Engineer professionals on Glassdoor, as of Jul 2026.