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Korawit Vichitpunyalak

@korawitvichitpunyala

Python backend developer building FastAPI systems, including a motorcycle shop ERP with double-entry accounting and catalog-grounded AI.

Thailand

Message

I built the PR.Racing Shop motorcycle shop ERP backend with FastAPI, covering products and bike compatibility, inventory, orders, customers, and admin authentication. I also implemented a double-entry general ledger and a catalog-grounded AI Q&A assistant.

Across my AI projects, I built document-grounded systems for policy questions, business operations, and résumé analysis. They use REST APIs, relational data models, and RAG pipelines with hybrid search and reranking.

Experience

Work history, roles, and key accomplishments

Python Backend Developer

PR.Racing Shop

Built an ERP backend covering product and bike compatibility, inventory, orders, customers, and admin authentication. Implemented a double-entry general ledger and a catalog-grounded AI Q&A assistant.

fastAPI SQLAlchemy SQLite REST APIs JWT AI RAG ClaudeVision LINE Messaging API OCR

AI Application Developer

Multi-User Expense Tracker & AI Policy Assistant

Built JWT-authenticated, user-scoped APIs for expenses and documents on PostgreSQL. Implemented PDF ingestion, hybrid search, and reranking to answer policy questions with cited sources.

fastAPI PostgreSQL RAG Azure AI Search JWT PDF Processing Hybrid Search Reranking

AI Resume Analyzer

Built a résumé analysis API with general and role-specific review modes. Used Pydantic schemas to return structured scores and actionable feedback from LLM output.

fastAPI Gemini Pydantic LLM REST APIs

AI Business Operations Hub

Built a multi-module backend for blind hiring review, invoice discrepancy auditing, and document-grounded customer support. Containerized the services with Docker and created interactive previews.

fastAPI PostgreSQL RAG Docker LLM Azure AI Search