Captions

Software Engineer, Agents

Union Square, New York City · Full-time

Sponsorship not specifiedDetected 24 days ago

Machine LearningLLMsRAGAgentic AIA/B TestingSystems EngineeringResearchProblem Solving

About the role

Software Engineers on the agents team work across product, machine-learning, and systems engineering - owning meaningful problems end-to-end and helping define how our agents are built and deployed across the product.

Build and ship end-to-end agentic systems that meaningfully improve creative workflows, balancing quality, performance, and reliability
Design agent architectures - how agents gather context, plan, select tools, and execute creative tasks reliably at scale
A track record of designing and developing ML systems or agentic pipelines in production
Experience building evaluation systems and agentic infrastructure (context gathering, tool selection, multi-step planning)
Able to operate effectively in an extremely fast-paced environment and scope and deliver projects end-to-end

Exceptional problem solving fundamentals and ability to learn quickly in a rapidly evolving space
You have worked with multi-agent architectures
You have experience fine-tuning LLMs for specific use cases
You have a pulse on where generative media and agentic AI technology is going
You are grounded, collaborative, and willing to do whatever it takes to help the team win
You have been a startup founder or an early engineer at one
Deep experience with context engineering: RAG systems, token optimization, context management at scale

Mirage is an AI-native video platform that intelligently orchestrates production and editing through natural language.
Our models leverage contextual awareness to execute the same creative decisions a professional editor would - dramatically improving productivity for experienced teams, while making video creation accessible to anyone.
We're an interdisciplinary team addressing some of the most difficult technical and creative challenges in generative media.
As an early member of our team, you'll tackle foundational problems that remain largely unsolved across the industry, driving an outsized impact on the future of creative expression.
More about us
Product (Captions by Mirage)
Research (Seeing Voices, technical-white-paper)
Updates (Mirage on X / twitter)
TechCrunch, Forbes AI 50, Fast Company (press)
Our Investors
We're very fortunate to have some the best investors and entrepreneurs backing us, including Index Ventures, Kleiner Perkins, Sequoia Capital, Andreessen Horowitz, General Catalyst, Uncommon Projects, Kevin Systrom, Mike Krieger, Lenny Rachitsky, Antoine Martin, Julie Zhuo, Ben Rubin, Jaren Glover, SVAngel, 20VC, Ludlow Ventures, Chapter One, and more.
Please note that all of our roles will require you to be in-person at our NYC HQ (located in Union Square)

This listing is sourced directly from Captions's careers page and normalized into a canonical job model.