Senior Backend Engineer (Go + ComfyUI), a product company with generative image and video features

We are a senior engineering team hiring a backend engineer for a long-term role inside a client's product team. The client is a product company with a large user base. We share its name only with engineers who pass our technical call. Engineers there shape what gets built, not only how, and work directly with product people. The product's image and video generation runs on ComfyUI workflows, so hands-on ComfyUI is a must for this role. What matters most to us • You have built or run ComfyUI workflows yourself, with models deployed locally and custom nodes in the pipeline • You have built a product that people use every day, and you can point to the parts you owned • You think about the person using the product. You question a feature when it does not serve them and suggest a better one • Experience with consumer products built around image or video is a strong plus What you will do • Build and run ComfyUI workflows for image and video generation • Build and scale the backend services around them in Go • Run background jobs reliably, with queues, retries and idempotent steps • Turn new models into features people actually use You should have • Hands-on ComfyUI, at least on your own projects • 3+ years of Go in production and 5+ years of backend work overall. • Experience owning parts of a production system end to end • Fluent English for daily work with the client team The role is full time, 40 hours a week, long term, with a working day that overlaps European business hours. Individual engineers only, no agencies. How we hire: a call with our CTO about your ComfyUI work, your product work and your code, then a call with the client's team. Both are live, with screen share and without AI assistants. To apply, open your application with a link to a ComfyUI workflow you built or ran, or one sentence on what it did. Applications without it will not be read.