I am building an online classifieds platform and need an AI-driven API that lets customers upload their ads quickly and accurately. The first release must focus on product-sale listings, capturing every essential field—product description, price, condition and usage history, plus seller contact information—then validating and mapping that data straight into my existing database. Although product sales are the priority, I want the codebase structured so we can switch on job postings later. When that happens, each job ad will have to accept a job title and description, company information, and the relevant application-process details without major refactoring. Deliverables • A RESTful API (Python or Node preferred) with authentication, ad-creation endpoint, and clear JSON schema definitions • Lightweight NLP or rule-based logic that can interpret semi-structured user input and auto-fill the required ad fields • Unit tests and sample cURL/Postman requests proving that a product-sale ad containing all mandatory fields returns a 201 response • Concise setup guide and inline documentation so my in-house team can extend it for future job-posting support