Putu Kartika Widya Arjentinia
I’m a business process analyst and full-stack developer with applied data science experience, working across restaurant technology, cross-platform accounting, and public-sector forecasting systems.
About
I’m a business process analyst and full-stack developer with applied data science experience, working across restaurant technology, cross-platform accounting, and public-sector forecasting systems. I enjoy connecting process design and data to build end-to-end products—from mapping workflows to delivering production-grade software that real clients can use.
- Joined September 2026
Industry experience
- Software & Internet
- Government
- Financial Services
- Retail
Work experience
Migrated a legacy Streamlit forecasting application to a full-stack FastAPI + React/TypeScript architecture covering all five BPJS programs. Trained and benchmarked 6+ forecasting algorithms (Prophet, XGBoost, LightGBM, Random Forest, ARIMA, SARIMA) per program using Leave-One-Out Cross-Validation with holiday effect adjustments via Google Calendar API integration. Implemented a forecast guardrail to prevent predictions from dropping below 85% of the latest actual value, reducing the risk of extreme outputs. Built a RAG-based internal AI chatbot with multi-provider fallback (Claude/Groq/Gemini) to keep raw company data from reaching external LLMs, and set up ongoing internal service data monitoring across all five programs.
Mapped HR processes using SIPOC and swimlane diagrams to identify inefficiencies and standardize cross-department handoffs. Transitioned manual HR workflows into automated low-code tools using AppSheet to support day-to-day execution. Presented process improvement recommendations directly to VP-level stakeholders.
Education
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