Applied AI Engineer, Video Agent

The Video Agent team builds a product that turns prompts, documents, and assets into finished videos. You’ll improve its agent behavior and quality measures, then ship features across the product’s React frontend and Python or Go backend.
* Permanent* On-site
* 2+ years
* Degree not required### Skills and expertise AI agentsAI evaluation

Type Script React Python Go A/B testing feature flags### Key responsibilities
* Design the agent’s tools, prompts, and context to improve planning and recovery from mistakes.
* Build evaluations, replay real sessions, and run experiments to measure agent quality.
* Ship user-facing React features and backend services or workflows in Python and Go.## How this job compares

Compared with 329 open mid-level machine learning jobs on October 10, 2026.Pay:
This job pays $180K to $240K a year. The 119 open mid-level machine learning jobs that publish US pay start at $180K on average, so this job starts in line with them.

Similar open jobs:
We Love AI Jobs lists 329 open mid-level machine learning jobs at 145 companies.

Remote work:
This job is on site. 66 of the 329 mid-level machine learning jobs (20%) are remote.

AI in this role:
High. AI is the core of the work: building, training or deploying AI systems. The core product is a multi-step AI agent, and the role directly improves its planning, tools, and behavior. The posting also says engineers work directly with Hey Gen’s in-house models and build evaluations of agent performance.## Full description

About Hey Gen At  Hey Gen, our mission is to make visual storytelling accessible to all. Over the last decade, visual content has become the preferred method of information creation, consumption, and retention. But the ability to create such content, in particular videos, continues to be costly and challenging to scale. Our ambition is to build technology that equips more people with the power to reach, captivate, and inspire audiences.

Learn more at  Visit our Mission and Culture doc here.

About the Video Agent team Video Agent turns a prompt, a document, or a handful of assets into a finished video. Behind a simple chat box sits a multi-step AI agent. It plans a storyboard, writes the script, chooses avatars, voices, and visuals, calls many tools along the way, and hands the result to our rendering pipeline. Customers use it every day to make training videos, product explainers, marketing content, and more.

We are a small team that owns the agent end to end. That covers the prompts and tools the agent uses, the backend services that run it, and the product screens where people chat with it and edit what it makes.

This is not a role where you only call someone else’s model through an API. Hey Gen trains its own models in house, and the agent is built on top of them. You will work directly with those models and with the researchers who build them, which is an experience few applied AI roles offer.

About the role

You will make Video Agent better at doing what the user actually asked for, and you will prove it with data. Some weeks that means redesigning a tool the agent calls. Other weeks it means building an eval, running an A/B test, or shipping a new editing experience in React. You will own features from the first idea through launch and follow-up, and you will decide which problems belong to the model and which belong to plain, deterministic code.

What you’ll do
• Build the agent. Design the tools, prompts, and context the agent works with. Improve how it plans, how it recovers from mistakes, and how it handles long, multi-turn conversations.
• Measure quality. Build evals and offline replays of real sessions. Run experiments behind feature flags and read the results honestly. Watch real user sessions and agent traces to find…