About the job
About Retell AI
Retell AI builds voice AI technology that helps businesses transform their call center operations. In just 18 months, thousands of companies have adopted Retell’s AI voice agents to streamline sales, support, and logistics, work that once required large human teams. Backed by investors including Y Combinator and Alt Capital, Retell has grown annual recurring revenue from $5M to $36M with a focused team of 20.
The company’s goal for 2026: a modern customer experience platform where AI powers entire contact centers. Retell is developing AI “workers” that can serve as frontline agents, quality assurance analysts, and managers, handling, evaluating, and improving customer interactions on their own.
- Named a top 50 AI app by a16z: https://tinyurl.com/5853dt2x
- Ranked #4 on Brex’s Fast-Growing Software Vendors of 2025: https://www.brex.com/journal/brex-benchmark-december-2025
- Featured on the Lean AI Leaderboard: https://leanaileaderboard.com/
Role Overview: Research Scientist – LLM
Retell AI is hiring a Research Scientist focused on large language models (LLMs) and audio processing. This role suits machine learning researchers who want to push the boundaries of real-time AI and see their work in production.
What You Will Do
- Investigate new approaches in large language models and audio processing for human-like voice agents
- Design and implement evaluation methods for complex, real-world conversational systems
- Prototype systems to improve reasoning, reduce latency, and enhance conversation quality
- Work closely with engineering and product teams to bring research advances into production
Impact
Research at Retell directly shapes the capabilities of voice AI agents for thousands of businesses. The work blends advanced research with practical deployment, improving how customers interact with automated systems across industries.
Location
This position is based in the San Francisco Bay Area.

