Senior Software Engineer, Frontend

ComfyUI; San Francisco (CA); On-site; USD 100,000 - 140,000; Full time

Job summary

A leading visual AI platform in San Francisco is seeking a front-end engineer to design and develop core frontend architecture for new products. The ideal candidate will have experience leading technical initiatives and optimizing user experience. This role requires a passion for creating beautiful and accessible applications in a fast-paced startup environment. Mentorship opportunities are available as part of a collaborative team aiming to push the ecosystem forward.

Qualifications

• Experience shipping applications with significant real-world traffic.
• Ability to create fast, accessible, and beautiful user experiences.
• Thrives in fast-moving environments and takes ownership.

Responsibilities

• Lead design and development of frontend architecture for new products.
• Rapidly prototype features to validate ideas and user experience.
• Establish best practices for code quality, testing, performance, and maintainability.

Skills

Experience leading technical initiatives

Expertise in modern front-end tooling (TypeScript, CI/CD)

Strong user experience optimization skills

Ability to mentor future engineers

Startup mindset

Job description

The Role

As one of our first front-end engineers, you’ll ship new features.

What you’ll do

• Lead the design and development of core frontend architecture of new products from the ground up.
• Rapidly prototype and iterate on features to validate ideas and user experience.
• Establish best practices for code quality, testing, performance, and maintainability.
• Collaborate closely with design, product, and backend teams to shape the user experience end-to-end.
• Contribute to key technical and product decisions as part of the founding engineering team.
• Mentor future engineers and help build a high-caliber frontend team and culture.

Must-have experience

• Shipped applications with significant real-world traffic or user counts.
• Experience leading technical initiatives and shipping scalable, high-performance web and desktop applications.
• Strong expertise with modern front-end tooling. (TypeScript, CI/CD pipelines)
• Expertise in optimizing complex UX interactions in web and desktop applications.
• A passion for creating fast, accessible, and beautiful user experience.
• Startup mindset: you thrive in fast-moving environments, take ownership, and love solving problems at scale.

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 who 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 Infinitely extensible — 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

ComfyUI isn’t just another AI app. It’s aiming to become the operating system for visual generative AI, the foundation on which the next generation of creative tools are being built.

An creative’s show case of how Comfy is adopted in their work

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 way before working here.

Our organization is flat and there is no hierarchy, only categories: devv, artz, prod, oprt, etc (and no, there is no one here with the title of Member of Technical Staff, it’s long and silly for a job title).

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. If this mission excites you and you view yourself as a top‑tier talent, your future latent self is waiting for you at Comfy.

Check out our Github and blog for what we’ve been working on. Our investors include Pace Capital, Chemistry, Abstract Venture, and Guillermo Rauch.