ComfyUI Engineer.

Home Careers ComfyUI Engineer All careers We're hiring Workflows ComfyUI Engineer. Own the workflows that power millions of AI images every month. You think in nodes, you debug in graphs, you care obsessively about output quality. Remote global Full-time / contract Senior IC + equity Apply now How we hire workflow_headshot_v3.jsonrunning Load Checkpoint flux-dev-fp16 CLIP Encode "portrait, 4k" ControlNet face-pose-v2 KSampler steps: 28 cfg: 7.0 euler_a seed: 42819 Output FaceDetailer sim: 0.92 The role Runflow is the AI image and video infrastructure layer for production. We power the AI headshots, fashion shoots, and product photography that companies like BetterPic and BetterStudio ship every day, millions of images a month, with quality scored before delivery. We're hiring a ComfyUI Engineer to own the workflows that produce them. This isn't a research role. You'll ship production workflows that directly impact output quality, customer retention, and revenue. You're the person who decides which checkpoints, which LoRAs, which control nets, which sampler, and how it all stays under VRAM and latency budgets at scale. If you debug node graphs in your sleep, train LoRAs for fun, and have strong opinions on face similarity vs. likeness preservation, this is for you. Quick facts TeamWorkflows Reports toHead of AI LocationRemote global TypeFull-time or contract CompensationSenior IC + equity StartASAP Representative projects What you'd ship in your first 6 months. Concrete, shippable, on the live roadmap. Not hypothetical. We expect every one of these to land. Project 01 Ship a face-similarity workflow that holds 99%+ likeness across 500-image batches Pick the checkpoints, design the conditioning chain, calibrate the IP-Adapter / face-swap stack, and run the eval. Hand it off to Sentinel for live scoring. Project 02 Cut p95 latency on the BetterStudio pipeline by 40% Profile VRAM, swap samplers, prune the graph, parallelise where it pays. The win has to hold across realistic batch shapes, not synthetic benchmarks. Project 03 Train a domain-specific LoRA from scratch for a new product vertical Curate the dataset, set up the training loop, ship the LoRA into the workflow, validate against held-out evals. Document the recipe so the next vertical takes a week instead of a month.

Responsibilities

What you'll be doing. You'll 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)

Requirements

About you. You may be a good fit if… 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 Strong candidates also have… 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 What we're not looking for A specific number of years. A specific degree. A specific stack. We hire on whether you can ship end-to-end and whether you have taste. Everything else is noise. Tech stack What we work with. Backend Node.jsPythonPostgreSQLRedis Workflow ComfyUIdiffusersPyTorchHugging Face Infra AWSCloudflare R2ModalNeon Tools GitHubLinearSlackSentinel How we hire Five steps. Decision speed is part of the offer. We move fast because senior candidates with multiple offers reward the team that respects their time. Whole loop fits in two weeks. 01/5 Application submitted Form, ~5 min We read every word of every application. No silent rejections, ever. Triaged within 5 business days Apply now 02/5 Take-home challenge 2 hours max, your time A small, real Runflow problem. We score the prompts and decisions you made as much as the output itself. Reviewed within 3 business days 03/5 30 minutes with the CTO 30 min, live Quick conversation about your take-home, the team, and how you work day-to-day. Decision in 48 hours 04/5 Paid challenge, 2 days 2 days, we pay for your time A bigger problem we pay you to work through. We care about outcomes, not process. AI tools more than welcome. Decision in 48 hours 05/5 Closing interview 90 min, live Casual chat with the two founders. Decision in 24 hours Show, don't tell. We value proof over promises. When you apply, include examples. Things that stand out: Face-similarity workflows with consistent identity preservation across batches Batch generation pipelines with quality gating built in Custom conditioning logic or node modifications you wrote yourself LoRA training results and the methodology you used Apply Ready to ship? Five minutes. We read every word. Yes / no / not-now within 5 business days, always. You're applying for ComfyUI Engineer Workflows Name* Email* Location optional, city, country, time zone Links* At least one, LinkedIn, GitHub, portfolio, Loom, anything. Show us 1–3 things you've built that prove you can ship end-to-end. Repos, posts, demos, anything. Specifics beat resume bullets. 1500 left What's a problem you solved with AI as the execution layer, not just chat? We care that you reach for AI as a default tool, not occasionally. 1000 left Show us a product you find beautiful. Why? Taste is non-negotiable. We want your real opinions. 800 left Which AI tools are in your daily workflow? Pick all you actively use, not just tried. How much is AI helping you these days? A sentence or two. Skeptical, force multiplier, in between, where it shines, where it doesn't. 600 left Share a Claude Code session that shipped a feature end-to-end. Optional but high-signal. We want to see how you actually work with AI, the prompts, the back-and-forth, the corrections. Whole session, snippet, Loom, gist, anything. 3000 left When have you most successfully hacked a non-computer system to your advantage? Optional. Bureaucracy, supply chain, a conference badge, social dynamics, anything. We collect signal here. 1000 left Most recent role + company Just the title + company name. We don't need a CV. 200 left When could you start? Salary expectation Confidential. A range is fine. 200 left Share an actual ComfyUI workflow you're proud of. The workflow IS the portfolio. Paste the JSON, link a Gist, link a Loom of you walking through the graph, anything that lets us actually see it. If it ran in production at scale, even better, tell us about the volume + the gnarliest debug it survived. Written-only descriptions are a soft no. 5000 left Anything else? Optional. A short note, a question, a relevant detail we missed. 500 left We commit to a yes / no / not-now within 5 business days. Always. No silent rejections. Other open roles Maybe one of these instead. We hire builders, not roles. If none fit exactly, the open application is at the bottom. Sentinel·Remote global Machine Learning Engineer Help build the AI quality scoring layer Runflow runs in front of every image and video we ship. Hands-on ML, in production tomorrow, at scale. View role Infrastructure·Remote global DevOps Engineer Build the infrastructure that powers the next generation of AI media. GPU fleet, warm workers, queues, FastAPI services, in production tomorrow. View role DevRel·Remote global DevRel Engineer Ship cool things on top of Runflow, bring creators in, drive adoption of the next generation of AI image + video infrastructure. View role Open·You define it Open application Don't see your role? Tell us what you'd build at Runflow and how it moves the mission forward. Apply openly