A sales engineer (SE), also titled presales engineer, is a technical role on or beside a sales team that helps win deals with demos, proofs of concept and technical answers. The U.S. Bureau of Labor Statistics describes sales engineers as selling business products or services that need technical expertise, and says employers usually pay them salary plus commissions or salary plus bonuses. Source 5Sales Engineers - Occupational Outlook HandbookPublisherU.S. Bureau of Labor StatisticsSource typeUS government data As of September 2026, Twilio’s Principal Presales Engineer posting puts the role in the sales team, running demonstrations and proofs of concept with account executives, and makes it eligible to earn commissions. Source 1Principal Presales EngineerPublisherTwilio (Greenhouse)Source typecompany job posting Cloudflare’s Customer Engineer posting, also as of September 2026, calls the role quota-carrying and says it oversees the implementation but does not execute it. Source 2Customer Engineer, KoreaPublisherCloudflare (Greenhouse)Source typecompany job posting
Why it matters in interviews
SE experience is strong customer evidence: you have run discovery, handled objections and demoed to executives. The gap to close is what you built that ran after the deal closed, so bring one story where your code stayed in production and name who used it. Don’t frame the move as leaving sales. LangChain’s Deployed Engineer posting, as of September 2026, has you own the technical win in pre-sales Source 3Deployed Engineer (Bay Area) @ LangChainPublisherLangChain (Ashby job board)Source typecompany job posting, and The Pragmatic Engineer reported, in August 2025, that many startups employing FDEs use them to help win customers. Source 6Forward Deployed Engineers (Gergely Orosz)PublisherThe Pragmatic EngineerSource typenews report Frame it as staying on after the sale: you still help win the deal, and you are also the one who ships it. OpenAI’s Financial Services posting in New York, as of September 2026, asks the FDE to lead discovery and scoping from pre-sales through post-production and to own on-call readiness for the AI systems it ships. Source 4Forward Deployed Engineer (FDE), Financial Services- NYCPublisherOpenAI (Ashby)Source typecompany job posting Name the on-call part, and say what you would have been paged for in your last deal if you had owned it. If an FDE posting mentions commission or quota, check its pay basis; the OTE entry has the questions to ask.
The lesson FDE, software engineer, solutions architect, sales engineer: telling them apart covers quota, and the other lines that decide the role.