
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)
| Company |
|---|
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)”
About AssemblyAI AssemblyAI builds the best-in-class Speech AI models powering the next generation of voice applications. Our models serve 600M+ inference calls monthly, process 1M+ hours of audio daily, and power 2 billion+ end-user experiences—from voice agents and meeting assistants to contact centers and medical scribes. Companies like Zoom, Granola, Fireflies, Cluely, and Calabrio rely on AssemblyAI to ship production-ready voice AI.
We're at an inflection point in Speech AI. We released Universal-Streaming in mid-2025, and it has quickly earned its place as the model offering the best accuracy-latency-cost tradeoff on the market. Our research team drives these advances and ships with relentless velocity. Since releasing Universal-Streaming, we've already launched keyterms prompting feature and multilingual support—with more significant improvements on the roadmap.
We've raised $115M+ from Accel, Insight Partners, Y Combinator's AI Fund, Patrick and John Collison, Nat Friedman, and Daniel Gross. We're a remote team building one of the next great AI companies—and we're looking for researchers who will shape its future.
The Role AssemblyAI is growing quickly, and we're searching for a driven and dedicated Senior API Support Engineer to work on our multi-functional team. This role will support our customers in the Australia timezone and requires working 8-5pm ACT. We're growing rapidly, and looking for someone who loves interacting with customers, and has the technical experience to collaborate with developers to help troubleshoot their integrations with our API. Ideally, you have experience working as a developer or technical support in a past role. With significant investment and strong leadership to fuel our growth, it's the perfect time to join the AssemblyAI team.
What you will do:
What you'll need:
Nice to have:
Pay Transparency AssemblyAI strives to recruit and retain exceptional talent from diverse backgrounds while ensuring pay equity for our team. Our salary ranges are based on paying competitively for our size, stage, and industry, and are one part of many compensation, benefit, and other reward opportunities we provide.
There are many factors that go into salary determinations, including relevant experience, skill level, qualifications assessed during the interview process, and maintaining internal equity with peers on the team. The range shared below is a general expectation for the function as posted, but we are also open to considering candidates who may be more or less experienced than outlined in the job description. In this case, we will communicate any updates in the expected salary range.
The provided range is the expected salary for candidates in Australia. Outside of those regions, there may be a change in the range which will be communicated to candidates throughout the interview process.
Salary range: AU$167,440 - AU$191,360
Working at AssemblyAI We are a small but mighty group of startup veterans and experienced AI researchers with over 20 years of expertise in Machine Learning, Speech Recognition, and NLP. As a fully remote team, we're looking for people to join our team who are ambitious, curious, and lead with integrity. We're still in the early days of AI and of AssemblyAI's journey, and are looking for teammates who won't just fit in, but will help us define and build our company culture.
We're committed to creating a space where our employees can bring their full selves to work and have equal opportunity to succeed. No matter your race, gender identity or expression, sexual orientation, religion, origin, ability, age, veteran status, if joining this mission speaks to you, we encourage you to apply!
Using AI to Interview: If you're selected for an interview, please review this resource to better understand how AssemblyAI approaches the use of AI in our interview process.
GDPR privacy notice: Candidates from the EU should review this job applicant privacy notice before applying.
Keep Exploring AssemblyAI:
Keep Exploring AssemblyAI: Check us out on YouTube!
Learn more about AI models for speech recognition
Speech-to-Text | Speech Understanding | LLM Gateway | Try the Playground
Our $50M Series C fundraise