The salary trajectory of a a Process Design Engineer ranges between locations and employers. The salary starts at £34,313 per year (estimate) and goes up to £58,677 per year (estimate) for the highest level of seniority.
The estimated average salary for a Process Design Engineer at ExxonMobil is £40,395 per year or £19 per hour, but some professionals have reported earning up to roughly £66,232 per year (90th percentile). The typical pay range is between £31,136 (25th percentile) and £52,407 (75th percentile) annually. This is based on 80 salaries submitted by ExxonMobil Process Design Engineer professionals on Glassdoor, as of Jul 2026.