Note: The job is a remote job and is open to candidates in USA. Runflow is the AI image and video infrastructure layer for production, powering millions of images every month. They are seeking a ComfyUI Engineer to own the workflows that produce AI-generated images, focusing on optimizing output quality and customer retention.
Responsibilities
- Own the full lifecycle, from prototype to production at scale
- Build, optimise, and debug ComfyUI workflows for human-centric and product image generation
- Profile node chains. Cut VRAM, latency, and cost without sacrificing quality
- Wire workflows into Runflow's Solutions API, Python, TypeScript, REST
- Run batch inference and post-processing at production scale (millions/mo)
- Iterate on output quality. Hand off failure modes to Sentinel; learn from its scores
- Build dynamic conditioning systems, variable poses, styles, backgrounds, products
- Maintain a versioned, documented workflow repo other engineers can read
- Train and fine-tune checkpoints + LoRAs (Flux, SDXL, Wan-style pipelines)
Skills
- You've shipped ComfyUI in production for 6+ months, setup, custom nodes, debugging gnarly graphs
- You have deep working knowledge of diffusion models (SDXL, Flux, the open-source release of the month)
- You've built workflows tuned for realism and identity preservation, face similarity is second nature
- You're comfortable with ControlNets, IP-Adapters, segmentation, and the full conditioning toolbox
- You optimise compute. You know when to swap a sampler vs. retrain a LoRA
- You're fluent in GitHub, Python, and REST, the workflow is just one part of a system
- Have trained LoRAs or fine-tuned checkpoints (Flux/SDXL/Wan) end to end
- Use the diffusers library and Hugging Face tooling fluently
- Have built integrations connecting ComfyUI to external services (Plytix, Shopify, custom CMSes)
- Have shipped production pipelines at scale (>100K images/day) and lived to tell the war stories
- Have a public portfolio of workflows you'd be proud to walk us through
Benefits
- Equity
- Remote
- Full-time or contract
- Paid challenge, 2 days
- Decision speed is part of the offer
- We pay you to work through the bigger problem during the paid challenge
- No silent rejections, always
- Apply now / yes / no / not-now within 5 business days
Company Overview