Intercom

Intercom is the Dublin-founded customer-messaging and support platform that effectively invented the in-app chat widget category in the early 2010s and has since evolved into one of the most widely deployed AI customer-service products in B2B SaaS. The company was started in 2011 by four Trinity College Dublin graduates — Eoghan McCabe, Des Traynor, Ciaran Lee, and David Barrett — who combined messaging, user segmentation, and lifecycle marketing into a single pane of glass at a time when enterprise support software was still dominated by ticket queues. Intercom's current product centers on Fin, its LLM-backed support agent that answers customer questions autonomously against a company's knowledge base, and it has become one of the clearest commercial examples of a pre-AI SaaS incumbent successfully retooling its core product around generative AI. The company is now headquartered in San Francisco but maintains a very large Dublin engineering and product office, and together with Stripe it is one of the canonical 'Irish mafia' software stories.