Founding Software Engineer (Full-stack)

Lemon Slice's mission (formerly Infinity AI) is to build the world's best video foundation model for human motion and emotion. We allow creators to generate expressive, talking characters across all styles, from photorealistic to cartoons. We've raised a $6M seed round from top investors including Y Combinator, Matrix Partners, The Chainsmokers, Emmett Shear (Founder/CEO at Twitch), Arash Ferdowsi (Founder/CTO at Dropbox), and many others. Our usage and user base is growing rapidly with over 1M videos generated on the platform. We have more demand than we can handle and are looking for talented engineers to join us and help grow the momentum. . What You'll Do We all wear many hats at Lemon Slice. Everyone in our close-knit team works across technical areas, from frontend to backend and from AI research to data engineering. For example, in a typical two-week period you might do 2-3 of the following: Ship new web app features and handle customer support requests Clean and label internet-scale video data Scour arXiv papers for ideas on how to fix a specific diffusion bug Monitor training of our latest diffusion transformer model across 100s of GPUs Do what it takes to cut our inference costs Launch a new 0-1 consumer app experience With that said, a big thrust of your work will be building and maintaining performant web applications. . Requirements Ship production code for all aspects of our web applications. Ship frequently (ideally multiple times per week). Our tech stack includes: NextJS, TypeScript, Tailwind, Supabase / PostgresSQL, Python, and Modal. Strong Python skills (incl. data cleaning and labeling, data infrastructure, data visualization) Ability to rapidly prototype solutions and iterate on them with tight product deadlines Ability to handle open-ended problems (e.g. often comes from research experiences) . Nice-to-haves Prior startup experience Experience with deep learning (PyTorch, distributed training, etc) Excitement about consumer products and AI A hobby in the arts (video, photography, music, anime, etc) . About You You have strong experience in React and web development, such that typical performance issues rarely happen. You take extreme pride in your work. You're unhappy shipping anything that doesn't look and work great. You are comfortable both shipping new 0-1 prototypes as well as features for large, existing codebases. You're worked on open-ended data problems and are comfortable wrangling large-scale datasets You're intellectually curious, a good communicator, take feedback well, and have the ability to operate with high velocity. . Logistics This is a full-time, in-person opportunity in San Francisco. $140,000 - $220,000 a year 0.5%-2.0% equity We are open to sponsoring international candidates (e.g. OPT, H1B, O1) Relocation support for those moving to the Bay Area 90% Gold PPO plan coverage of medical, dental, and vision . How to apply Want to stand out in our inbox? Please include a LINK to your personal portfolio or a specific project you're proud of.

Lemon Slice's mission (formerly Infinity AI) is to build the world's best video foundation model for human motion and emotion. We allow creators to generate expressive, talking characters across all styles, from photorealistic to cartoons. We've raised a $6M seed round from top investors including Y Combinator, Matrix Partners, The Chainsmokers, Emmett Shear (Founder/CEO at Twitch), Arash Ferdowsi (Founder/CTO at Dropbox), and many others.