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Member of Technical Staff, Training Data Infrastructure

Mirage
New York City, United Statesfull_timeVerifiedPosted 4 Nov 2025
💰 $300,000/yr($215,000/yr$300,000/yr)

About the role

Mirage is the leading AI short-form video company. We’re building full-stack foundation models and products that redefine video creation, production and editing. Over 20 million creators and businesses use Mirage’s products to reach their full creative and commercial potential.

We are a rapidly growing team of ambitious, experienced, and devoted engineers, researchers, designers, marketers, and operators based in NYC. As an early member of our team, you’ll have an opportunity to have an outsized impact on our products and our company's culture.

Our Products

Captions

Mirage Studio

Our Technology

AI Research @ Mirage

Mirage Model Announcement

Seeing Voices (white-paper)

Press Coverage

TechCrunch

Lenny’s Podcast

Forbes AI 50

Fast Company

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, 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)

We do not work with third-party recruiting agencies, please do not contact us**

About the Role and Team:

Captions seeks an exceptional Research Engineer (MOTS) to drive innovation in training data infrastructure. You'll conduct research on and develop sophisticated distributed training workflows and optimized data processing systems for massive video and multimodal datasets. Beyond pure performance, you'll develop deep insight into our data to maximize training effectiveness. As an early member of our ML Research team, you'll build foundational systems that directly impact our ability to train models powering video and multimodal creation for millions of users.

You'll work directly alongside our research and engineering teams in our NYC office. We've intentionally built a culture where infrastructure and data work is highly valued - your success will be measured by the reliability and performance of our systems, not by your ability to navigate politics. We're a team that loves diving deep into technical problems and emerging with practical solutions.

Our team values:

  • Quick iteration and practical solutions.

  • Open discussion of technical approaches.

  • Direct access to decision makers.

  • Regular sharing of learnings, results, and iterative work.

Key Responsibilities:

Infrastructure Development:

  • Build performant pipelines for processing video and multimodal training data at scale.

  • Design distributed systems that scale seamlessly with our rapidly growing video and multimodal datasets.

  • Create efficient data loading systems optimized for GPU training throughput.

  • Implement comprehensive telemetry for video processing and training pipelines.

Core Systems Development:

  • Create foundation data processing systems that intelligently cache and reuse expensive computations across the training pipeline.

  • Build robust data validation and quality measurement systems for video and multimodal content.

  • Design systems for data versioning and reproducing complex multimodal training runs.

  • Develop efficient storage and compute patterns for high-dimensional data and learned representations.

System Optimization:

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Company

Mirage

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