Senior AI Backend / Machine Learning Engineer for AI Image Editing SaaS

Hi, We are a PropTech startup developing IRIS, an Unreal Engine 5 application used by real estate developers to present apartments interactively in sales showrooms. We are looking for an experienced AI Backend / Machine Learning Engineer to build the backend infrastructure for a new premium feature called IRIS AI Photo Studio. ((Important: You do NOT need Unreal Engine experience. Another developer is responsible for the Unreal client. Your responsibility is the AI backend and image generation pipeline.)) Goal: Users create a screenshot inside IRIS. They select presets such as: * Time of day: * Season: * Weather: * Mood: * Lifestyle Story: The backend sends the screenshot to an AI image editing model and returns a new marketing-quality visualization while preserving the original architecture. Responsibilities: * Design and build the AI backend * Integrate image editing APIs (FLUX, OpenAI Images, Stability AI or similar) * Build a prompt generation system * Design provider-independent architecture * Authentication * Image upload/download * Job queue * Logging / Signing up * Credit system * Image storage * API documentation Required Skills * Python (FastAPI) or Node.js * REST APIs * AI Image Generation / Image Editing * Diffusion models * Prompt Engineering * Docker * PostgreSQL / Supabase * AWS S3 / Cloudflare R2 * Authentication * Async backend architecture Nice to Have * FLUX * Stability AI * OpenAI Images API * ComfyUI * ControlNet * Segmentation * Image masking * Computer Vision What We’re Looking For: We’re not looking for someone who only knows how to call an AI API. We’re looking for someone who has already built AI-powered image generation products or production AI pipelines. Please include: * Relevant portfolio * Similar AI projects * GitHub (if available) * Tech stack you would recommend * Estimated architecture for this system Long-term collaboration is possible.