The salary trajectory of a Software Engineer I ranges between locations and employers. The salary starts at £50,474 per year (estimate) and goes up to £113,665 per year (estimate) for the highest level of seniority.
The estimated average salary for a Software Engineer I at Checkout.com is £138,530 per year or £67 per hour, but some professionals have reported earning up to roughly £183,709 per year (90th percentile). The typical pay range is between £121,744 (25th percentile) and £160,769 (75th percentile) annually. This is based on 156 salaries submitted by Checkout.com Software Engineer I professionals on Glassdoor, as of Jun 2026.