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HartoniAgungPermana/README.md

Hi, I'm Hartoni! 👋

Data Engineer | Analytics Engineer | Data Analyst

I specialize in building scalable data infrastructure and transforming messy data into a "Single Source of Truth." My approach is Engineering-First. I don't just build dashboards, I build the reliable pipelines that make those dashboards possible.

🛠️ Technical Skills

  • Languages: Python SQL
  • Data Engineering: Data Lakehouse Architecture, Data Warehousing, ETL/ELT Pipelines, dbt Core, Medallion Framework, Data Modeling, CI/CD Pipelines.
  • Big Data & Cloud: Databricks (Delta Lake, Unity Catalog), Apache Spark, Azure.
  • Analytics & BI: Power BI (Advanced DAX), Tableau, Excel, OLAP, Dimensional Modeling, Fact & Dimension Table Design, Ad-Hoc Analysis, KPI Development, Business Intelligence, Data Storytelling.
  • Data Management: Data Processing, Data Cleaning, Data Transformation, Performance Optimization.
  • Database Tools: SQL Server, MySQL.
  • Version Control Tools: Git, Github.

📂 Project Sub-Groups

🏆 Featured Project (The Masterpiece)

End-to-End Enterprise Sales Lakehouse

Tech: Databricks, PySpark, Medallion Architecture (Bronze/Silver/Gold), Delta Lake, Unity Catalog.

  • The Problem: Fragmented CRM/ERP data silos.
  • The Solution: Built a unified Lakehouse architecture with automated cleaning pipelines.
  • The Impact: Reduced manual data prep by 60% and achieved <1s dashboard latency for millions of records.

🏗️ Data & Analytics Engineering Project

End-to-End Business Intelligence Pipeline for Bike Sales Analysis

📊 Data Analytics & Strategy Projects

End-to-End Audiobook Market Analysis with SQL and Tableau

Tableau Business Performance Dashboard

Python Data Job Market Analysis: In-Demand Skills, Trends & Salaries

Tableau HR Dashboard

FlipMart Retail Sales Performance Excel Dashboard

📫 Let's Connect!

"I build the data systems that scale with your business." 🚀

Pinned Loading

  1. end-to-end-enterprise-sales-lakehouse end-to-end-enterprise-sales-lakehouse Public

    End-to-end enterprise sales lakehouse implementing Medallion ELT architecture with dimensional modeling for decision-ready analytics

    Jupyter Notebook 1

  2. sql-audiobook-market-analysis sql-audiobook-market-analysis Public

    An end-to-end data analysis of the audiobook market using SQL for in-depth data cleaning, transformation, and querying. Uncovers key insights into market trends, author performance, and pricing str…

    TSQL 1

  3. tableau-hr-analytics-dashboard tableau-hr-analytics-dashboard Public

    📊 Interactive Tableau HR Analytics Dashboard — A portfolio project showcasing workforce insights, employee demographics, salary trends, and performance analysis with modern data visualization and B…

    1

  4. excel-sales-dashboard excel-sales-dashboard Public

    Portfolio project: Interactive Excel dashboard for sales performance analysis — highlighting KPIs profit trends, customer insights, and real-world BI workflow simulation.

  5. sql-bike-sales-analysis-pipeline sql-bike-sales-analysis-pipeline Public

    A comprehensive data analyst portfolio project demonstrating an end-to-end Business Intelligence pipeline for bike sales. This project leverages advanced SQL for complex ETL, building a Medallion a…

    TSQL

  6. tableau-business-performance-dashboard tableau-business-performance-dashboard Public

    Tableau Business Performance Dashboard — An interactive data visualization project analyzing sales and customer performance for a retail company. Features YoY growth analysis, KPI tracking, custome…

    1