Targeting Engineering Function in Clay's People Search: Filtering for Builders, not Sellers or Recruiters

Anybody know how to approximate the Sales Navigator "function" role filter in Clay's People Search options to target folks that serve the "engineering" function at a company? Right now, I am using the "Find People using LinkedIn" option in Clay, which seems to only allows me to filter for job title keywords. I have been guessing at the right mix of keywords to include/exclude to produce a reliable list, but the results are still full of false positives (people who SELL software or RECRUIT engineers, but do not BUILD software). Am I missing something?