
AssemblyAI provides speech AI APIs that transcribe and extract insights from audio to make voice data searchable and actionable. The company delivers cloud-hosted speech-to-text and audio intelligence capabilities—including summarization, sentiment analysis, topic detection, content moderation, and PII redaction—via developer APIs and a no-code playground. Its technology stack centers on proprietary speech recognition models and LLM-based frameworks (e.g., LeMUR) for applying large language models to transcriptions. AssemblyAI operates as a B2B SaaS/API provider serving developers and companies such as CallRail, Fireflies, and Spotify. The platform targets voice-data use cases across contact centers, media, and analytics with integrations appropriate for product and developer workflows.

AssemblyAI provides speech AI APIs that transcribe and extract insights from audio to make voice data searchable and actionable. The company delivers cloud-hosted speech-to-text and audio intelligence capabilities—including summarization, sentiment analysis, topic detection, content moderation, and PII redaction—via developer APIs and a no-code playground. Its technology stack centers on proprietary speech recognition models and LLM-based frameworks (e.g., LeMUR) for applying large language models to transcriptions. AssemblyAI operates as a B2B SaaS/API provider serving developers and companies such as CallRail, Fireflies, and Spotify. The platform targets voice-data use cases across contact centers, media, and analytics with integrations appropriate for product and developer workflows.
What they do: Speech AI APIs for transcription and audio intelligence (summarization, sentiment, moderation, PII redaction, etc.)
Founded: 2017
HQ: San Francisco, CA
Total funding: ≈ $115M
Core customers: Developers and enterprises (examples: CallRail, Fireflies, Spotify)
Speech recognition and speech understanding for developers and enterprises across contact centers, media, and analytics.
2017
Software Development
$28M
Series A announced March 4, 2022 with participation from Y Combinator, John & Patrick Collison, Nat Friedman, and Daniel Gross
$30M
Series B announced July 14, 2022
$50M
December 4, 2023 round; brought disclosed total capital raised to roughly $115M
“Backed by top-tier VCs and notable angels (Accel, Insight Partners, Y Combinator, Nat Friedman, Daniel Gross, John Collison)”
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Experience
Salary and Perks
Pay range: $210K - $309K
About AssemblyAI Industry-leading Speech AI models to automatically recognize and understand speech.