Expert Backend Developer for Product Search Market

We are developing a minimalist product search marketplace where users can search across multiple e-shops using a single, fast search bar. The platform will index products from XML feeds provided by each e-shop and allow filtering by title, brand, EAN code, price, availability, color, size, and category/subcategory. This initial phase will cover 4–5 e-shops (~250K products), but the system must be designed to scale to 5000 e-shops and 50M+ products. We need a skilled expert to build the backend infrastructure for search — including XML data parsing, normalization, secure database structuring, and lightning-fast query performance. Tools like PostgreSQL, Supabase, Algolia, ElasticSearch or Typesense are welcome, along with automation via n8n. AI-based enrichment (e.g., synonyms, typo handling, product grouping) is a bonus. Our frontend is already built (React/Bolt.new); we now need a solid, scalable backend to support high-quality, real-time search results. If you’ve built high-performance product search systems, we’d love to work with you.