Senior Rag Engineer

**About us** Wallester is a cutting-edge financial technology company that specializes in providing innovative solutions for businesses seeking to modernize their payment systems. By offering white-label card issuance platforms, seamless integration with existing infrastructure, and comprehensive support for both digital and physical cards, Wallester empowers companies to enhance their financial services and customer experience. Recognized as a leader in the FinTech space, Wallester has earned a reputation for its state-of-the-art technology, security, and scalability. Whether you are a startup or an established enterprise, Wallester delivers flexible, reliable solutions tailored to meet the evolving needs of the digital economy. **About the role** Progressive deployment over 9 months: General knowledge base → Department integrations (Sales, Finance, Support) → Advanced features and scaling. We're looking for a true expert capable of designing and implementing complex RAG architectures with LangChain/LangGraph and orchestrating workflows with n8n. **What you'll do** **General Knowledge Base** - Design complete RAG architecture with LangChain - Implement Google Drive ingestion pipeline (5000+ documents) - Build 3-way hybrid search (semantic + BM25 + pattern matching) - Deploy Supabase with pgvector optimization - Create LangGraph workflows for orchestration **Department Integrations** - Connect Pipedrive (Sales), Admin Panel (Finance), Support systems - Develop autonomous agents per department with LangGraph - Build n8n workflows for business logic - Implement conversation memory and query routing **Production & Scaling** - Optimize for 1000+ queries/day with