Software Engineer, Core ComfyUI Contributor

Role You will be a core contributor to open source ComfyUI, one of the most popular open source projects of our time. Your mission is to create a world‑class creative tool and workflow engine. You will architect and implement the foundations that power our engineering organization—clean software abstractions, extensible RESTful APIs and Python SDK, and clean code. Decisions here have long‑lasting implications, and can result in massive headwinds or tailwinds for the project, thus requiring exceptional attention to detail and thoughtful design. Example Projects Writing shared abstractions that are extensible for future changes, such as the concept of subgraphs (within a graph) Designing data models that can be evolved in an open source environment Introducing a new core type, such as VIDEO or 3D Partnering with product design and frontend engineers to ship user‑facing features that also need to work in headless environments (many users run ComfyUI as an API service). Qualifications Experience writing Python and maintaining APIs and SDKs used at scale Regularly write and review code, maintaining a high bar for each Care deeply about elegant software design and writing clean code Bonus: Familiar with ComfyUI or other node‑based workflow tools Bonus: Strong understanding of tensors, PyTorch, and can contribute to implementing new models for ComfyUI What is ComfyUI? ComfyUI is the world’s leading visual AI platform — an open, modular system where anyone can build, customize, and automate AI workflows with precision and full control. Unlike most AI tools that hide their inner workings behind a simple prompt box, ComfyUI gives professionals the freedom to design their own pipelines — connecting models, tools, and logic visually like building blocks. It’s used by artists, filmmakers, video game creators, designers, researchers, VFX houses and among others, teams at OpenAI, Netflix, Amazon Studios, Ubisoft, EA, and Tencent all of whom want to go beyond presets and truly shape how AI creates. ComfyUI empowers those who were not trained with the power of the brush to also be a painter, and those who are, to be a maestro. Built for users who value transparency and control — thousands of community‑made nodes and integrations Scales from creative experimentation to production automation Open‑source , used by millions, and backed by one of the most active AI communities online Evolving to democratize visual AI creation : empowering everyone from hobbyists to studios, storytellers, and enterprises to be more productive and creative than ever before About Us We are a small, intense, and well‑funded team in San Francisco who push ComfyUI and its ecosystem forward. Our team comes from Stability AI and Google and many contributed to the ComfyUI ecosystem well before working here. Our organization is flat and there is no hierarchy, only categories: dev, arts, prod, ops, etc. The only thing that matters is the quality of your cultural fit and execution. We work hard and demand a lot of each other, but we have fun: everyone is here to make something meaningful that will end up being our life’s work. #J-18808-Ljbffr Comfy