Close builds a sales CRM for startups and small businesses, running on Python/Flask over MongoDB, PostgreSQL and Elasticsearch, with Twilio, WebRTC and WebSockets powering in-app calling. The project pipeline is dominated by AI work (call assistant, drafting tools, autonomous replies) alongside API scaling and a data model rearchitecture. A senior-weighted, engineering-heavy hiring push and a move off Webflow point to product and marketing site rebuilds underway.
Close is a privately held software company founded in 2013 and headquartered in Austin, Texas, with 51–200 employees. It sells a sales CRM aimed at founders, startups and small businesses that combines lead management, calling, email, SMS and automation in one product. Its newer AI offering, Chloe, acts as an embedded sales assistant that handles lead response and follow-up. The platform runs on AWS with Kubernetes and Terraform, and hiring is currently concentrated in the United States.
Close runs Python and Flask on AWS (EKS, MSK, RDS, ElastiCache) with MongoDB, PostgreSQL, Elasticsearch and Redis, plus React, React Native, TypeScript and GraphQL on the front end.
Yes. Close's stack includes Twilio alongside WebRTC and WebSockets, which support the built-in calling and real-time communication features of its CRM.
Close's projects include an AI-powered call assistant, AI drafting tools, autonomous reply systems and an agent-forward product experience aimed at speeding up customers' daily sales tasks.
Other companies in the same industry, closest in size
Close's technology stack, projects, and hiring signals are inferred from public hiring and company data — career pages, public listings, and company web presence — then clustered and de-duplicated. Figures are estimates that refresh over time. Read our full methodology →
This is not an official vendor or customer list. It is a technology-adoption signal inferred from public data, intended for B2B research.
