The 2025 list of engineering firms is ranked by engineering billings for the Austin office. Billings include projects in various stages from planning to completion, a cycle that often spans multiple years. Data is gathered from ABJ surveys. The Austin area includes Travis, Williamson, Hays, Bastrop and Caldwell counties. The top 50 responders report over $1.3 billion in billings for the local office in 2024. These same firms employed 1,470 engineers in the Austin area. The online version of this ranking expands beyond what appears in print with another 80 engineering firms included in our digital rankings. In case of ties, firms are ranked by companywide billings. Companies that did not respond to the ABJ survey but included on this year’s List are sorted by estimated total employment figures derived from ABJ archives; annual filings with the U.S. Department of Labor and other firm-specific resources. This week’s List is part of a shift in our research methodology and philosophy in 2025, one that will emphasize more data and context for readers while better coordinating the resources available to us and our 46 sister publications under the American City Business Journals flag. We anticipate this effort will identify thousands of new local records — and cumulatively, tens of thousands of new businesses across ACBJ’s footprint — this year alone.