Software Engineer at Haystack, Greater London, £500-£600 per day

ComfyUI Workflow Developer | London | Remote-Friendly | £500 - £600

We're working with a high-end creative agency specializing in hyper-realistic CGI for global luxury brands on this exciting opportunity.

We are looking for a technical visionary to bridge the gap between AI experimentation and high-end production pipelines. This role is about more than just generating pretty images; it’s about engineering robust, scalable AI architectures using ComfyUI, Python, and Stable Diffusion to meet the exacting standards of the luxury market. You will move from a high-impact POC sprint into a full-scale production deployment, automating asset generation that rivals traditional CGI.

The Role

• Architect and build advanced ComfyUI workflows capable of generating high-resolution, brand-compliant assets at scale.
• Develop custom Python scripts and API integrations to connect AI pipelines with existing Digital Asset Management (DAM) systems.
• Transition from a 4-week Proof of Concept (POC) into a full-scale production build handling global campaign volumes.
• Implement rigorous quality validation nodes and error-handling protocols to ensure every output meets luxury brand guidelines.
• Collaborate with CGI artists and creative directors to translate complex technical constraints into actionable production roadmaps.

What You’ll Need

• Advanced expertise in ComfyUI workflow development with a portfolio of complex, multi-node production pipelines.
• Deep technical knowledge of Generative AI models including Stable Diffusion (SDXL), Flux, and ControlNet architectures.
• Strong Python programming skills for automation, custom node creation, and API integration.
• Proven experience deploying AI solutions into live production environments, rather than just local prototyping.
• A background in CGI, product visualization, or high-end agency work where attention to detail is paramount.

What’s On Offer

• Competitive day rate of £500 - £600 (Inside/Outside IR35 status depending on contract structure).
• The chance to lead AI innovation for some of the world’s most recognizable luxury brands.
• Flexible hybrid/remote-friendly working model based out of a premier London-based studio.
• High-impact work with a clear pathway from initial prototype to global production deployment.

Apply via Haystack today.