Heygen
Applied AI Engineer, Video Agent
$180K–$240K
San Francisco, Palo Alto, Los Angeles, Toronto +2 · Full-time · Posted Oct 2, 2026
- Location
- San Francisco, Palo Alto, Los Angeles, Toronto
Palo Alto, California, United States
San Francisco, California, United States - Experience
- 2 or more years of professional experience.
- Education
- A degree in computer science or a related field is welcome but not required; equivalent experience counts.
About the job
Build and improve HeyGen’s Video Agent, an AI system that turns prompts, documents, and assets into finished videos, and measure its quality through evaluations and experiments.
What you'll do
- Design and improve the agent’s tools, prompts, context, planning, and recovery from errors.
- Build evaluations and offline replays, run experiments, and analyze user sessions and agent traces.
- Ship features across the stack using TypeScript, React, Python, and Go, partnering with product, design, research, and rendering teams.
What they ask for
- Have built and shipped a multi-step AI agent that calls tools and is used by real people.
- Have built evaluations or test sets for model behavior and can distinguish improvement from noise.
- Have 2 or more years of professional experience; fluent in TypeScript, React, and Python.
- Demonstrate strong product sense and ownership.
Nice to have
- Experience fine-tuning models.
- Experience with code-to-video models or video agent models.
Pay
$180,000 – $240,000 annually (base salary)
Tools
TypeScript, React, Python, Go
AI focus
Build and improve a multi-step video-generation AI agent, working directly with in-house models; develop evaluations and experiments to measure its behavior.
Model-written summary · the original posting is authoritative