Captions is the leading video AI company, building the future of video creation. Over 10 million creators and businesses have used Captions to create videos for social media, marketing, sales, and more. We’re on a mission to serve the next billion.
We are a rapidly growing team of ambitious, experienced, and devoted engineers, researchers, designers, marketers, and operators based in NYC. You’ll join an early team and have an outsized impact on the product and the company’s culture.
We’re very fortunate to have some the best investors and entrepreneurs backing us, including Index Ventures (Series C lead), Kleiner Perkins (Series B lead), Sequoia Capital (Series A and Seed co-lead), Andreessen Horowitz (Series A and Seed co-lead), Uncommon Projects, Kevin Systrom, Mike Krieger, Lenny Rachitsky, Antoine Martin, Julie Zhuo, Ben Rubin, Jaren Glover, SVAngel, 20VC, Ludlow Ventures, Chapter One, and more.
Check out our latest financing milestone and some other coverage:
The Information: 50 Most Promising Startups
Fast Company: Next Big Things in Tech
The New York Times: When A.I. Bridged a Language Gap, They Fell in Love
Business Insider: 34 most promising AI startups
Time: The Best Inventions of 2024

PREFERRED QUALIFICATIONS

• 5+ years of professional experience developing full-stack experiences at scale.
• Strong understanding of Computer Science fundamentals (algorithms and data structures).
• Proficiency in full-stack software development, including modern front-end technologies, back-end technologies, API frameworks, and cloud platforms.
• Bonus points for experience with complex rendering or real-time media processing

ABOUT THE ROLE

Our software engineers work across the stack to build consumer-facing products for millions of creators and businesses worldwide, and we’re currently hiring experienced full-stack engineers to join our web-platform team. Our product engineers push the limits of what’s possible in the browser—from custom graphics rendering to sophisticated video processing, and the integration of large video-generation models—tackling complex engineering and product challenges to enable creators to tell their stories with audio, video, and beyond.

KEY RESPONSIBILITIES

• Build user-centric products by leveraging modern frontend, backend, and API technologies, including advanced in-browser rendering (e.g., WebAssembly & WebGL).
• Implement full-stack solutions that balance performance, scalability, reliability, and extensibility.
• Own the product development lifecycle alongside cross-functional teammates (product, design, infra, and ML) to shape features from early concepts through final release.
• Maintain a high bar for code quality by championing best practices, testing, and participating in thoughtful code reviews.