Latest AI JobsBrowse Jobs
Captions logo

Research Engineer, Agentic Systems

CaptionsUnion Square, New York CityEngineering
Apply on company site
Salary
$175K – $300K
Job type
Full-time
Posted
28 Sept 2026
Status
Open · checked 7d ago

About this role

Role Overview

Captions is seeking a full-time Research Engineer, Agentic Systems to join the engineering team in Union Square, New York City. This role involves advancing large language models to handle multimodal creative tasks and building sophisticated agentic systems for video production.

Key Responsibilities

Build and architect complete end-to-end agentic systems tailored for creative applications.
Create fresh methodologies for adapting and training the large language models that power these intelligent agents.
Formulate unique objectives, build datasets, and apply fine-tuning techniques to enhance agent reliability and behavior.
Investigate multimodal reasoning along with structured generation to achieve advanced creative control.
Execute systematic experiments to assess and boost agent performance on real-world tasks.
Establish evaluation frameworks specifically for agentic workflows involved in video editing and analysis.
Investigate failure points across the entire agent loop, covering planning, execution, and tool use, while iterating on refinements.

Requirements

Possess a BS, MS, or PhD degree in Computer Science, Machine Learning, or a related field.
Demonstrate a strong history of building production-level machine learning systems or agentic pipelines.
Bring a deep comprehension of transformers and modern large language model techniques.
Have hands-on experience utilizing fine-tuning, post-training, or alignment methods, particularly for adapting models to manage structured outputs or control tool use.
Show comfort with taking ownership of the full technical stack, stretching from model-level tests to fully deployed agent systems.
Maintain strong experimental rigor paired with a practical sense of what makes agents succeed in real-world scenarios.

Skills and Tools

Large Language Models (LLM)
Transformers
Machine Learning Fine-Tuning and Alignment
Agentic Pipelines and Systems
Python and Modern ML Frameworks

Salary and Benefits

Annual salary range between $175,000 and $300,000 in USD.
Comprehensive health, dental, and vision medical plans.
401K plan featuring an employer match.
Commuter benefits and health wellness perks.
Catered lunches available multiple days per week.
Nightly dinner stipend for late-working team members.
Grubhub subscription.
Generous paid time off (PTO) policy.
Multiple annual team offsites accompanied by monthly team events.

About the Company

Captions operates Mirage, an AI-native video platform that orchestrates editing and production using natural language. The interdisciplinary team solves complex technical challenges in generative media. The company is backed by prominent investors including Index Ventures, Kleiner Perkins, Sequoia Capital, Andreessen Horowitz, and General Catalyst. All positions require in-person attendance at the New York City headquarters located in Union Square.

How to Apply

Interested candidates should visit the official Captions careers page to submit an application for this position.

Skills and tech stack

LLMTransformersFine-tuning

Questions candidates ask

What is the salary for the Research Engineer, Agentic Systems role?

The annual salary for this position ranges from $175,000 to $300,000 USD.

Where is this job located?

This full-time role is located in-person at the Captions headquarters in Union Square, New York City.

What qualifications are required for applicants?

Candidates need a BS, MS, or PhD in Computer Science, Machine Learning, or a related field, alongside a strong background in building production ML systems, deep knowledge of transformers and LLMs, and experience with fine-tuning or alignment.

What benefits are included for full-time employees?

Full-time employees receive comprehensive medical, dental, and vision plans, a 401K with employer match, commuter benefits, wellness perks, catered lunches, dinner stipends, a Grubhub subscription, generous PTO, and regular team offsites and events.

Is remote work permitted for this position?

No, all roles at Captions require employees to be in-person at the NYC headquarters in Union Square.

Ready to apply?

The application is on the official Captions careers page.

Apply on company site