Hi, I'm Leonardus Dale Masan

Data Science Data Analysis Machine Learning Fullstack Development

Passionate about leveraging data and technology to solve real-world problems and create innovative solutions.

Leonardus Dale Masan

About Me

I am an Informatics student currently in my 6th semester with a strong interest in Data Analysis and Business Intelligence. I am passionate about transforming raw data into meaningful insights that can support decision-making and solve real-world problems.

I have hands-on experience using tools such as Power BI, Excel, Python, and SQL to analyze data, build interactive dashboards, and extract valuable insights through academic projects. My primary focus is on data analysis, where I continuously improve my ability to understand data patterns and deliver data-driven solutions.

In addition, I have foundational knowledge and familiarity with various technologies, including web development and machine learning, which I have explored during my studies. This allows me to adapt quickly to new tools and technologies when needed.

I am known for being adaptable, consistent, and solution-oriented. When learning something new, I am able to focus deeply and continuously improve until I understand it well. I enjoy problem-solving and making decisions based on data, especially in project-based environments.

My goal is to help organizations leverage data to make better decisions, improve efficiency, and create impactful solutions.

My Learning Journey

I embarked on my Informatics journey in August 2023, starting with foundational programming knowledge. Through dedication and consistent practice, I transformed initial challenges into strengths, developing robust problem-solving skills and technical expertise.

Building Foundations

2023

Established core fundamentals in computer science:

  • Algorithms and Programming
  • Discrete Mathematics
  • Digital Systems

Developed logical thinking and mastered programming fundamentals through hands-on practice.

Developing Proficiency

2024

Advanced my programming capabilities through:

  • Object-Oriented Programming
  • Data Analysis Programming
  • Statistics and Probability

Gained confidence in software development and understood program architecture and design principles.

Systems & Data Management

2024

Deepened expertise in data and systems:

  • Database Design and SQL
  • Artificial Intelligence
  • Advanced Object-Oriented Programming

Mastered data management principles and system architecture fundamentals.

Machine Learning & AI

2025

Explored intelligent systems and algorithms:

  • Machine Learning
  • Algorithm Analysis
  • Distributed Systems

Learned to leverage data for building predictive models and intelligent solutions.

Specialized Technologies

2025

Advanced into specialized domains:

  • Data Warehouse
  • Natural Language Processing (NLP)
  • Computer Vision
  • Cryptography

Applied knowledge to real-world projects in data analysis and machine learning.

Advanced Analytics

2026 – Present

Expanding expertise in cutting-edge technologies:

  • Big Data
  • Data Mining
  • Optimization Algorithms
  • Business Intelligence

Currently focused on developing production-ready solutions and preparing for professional opportunities in Data Science.

My Growth

Progressed from learning programming basics to building production-ready applications
Evolved from struggling with code to mastering logical problem-solving
Transformed theoretical knowledge into practical, real-world implementations

Career Focus

I am dedicated to advancing my expertise in:

Data Science
Data Analysis
Machine Learning
Backend / Fullstack

My Skills

Programming Languages

Java
Python
PHP
JavaScript

Frameworks & Tools

Laravel
MySQL
HTML
CSS
Git
GitHub
Figma
Filament

Data Analysis & ML

Power BI
Scikit-learn
Pandas
NumPy
DAX
Data Viz

My Projects

Web & Application

PlayStation Rental Management System

Imagine running a PS rental business with spreadsheets and WhatsApp. This system replaces all of that with one clean dashboard — customers browse and book online, payments process automatically, and owners watch revenue roll in real-time.

Four roles, four separate dashboards. Admins control everything. Cashiers handle walk-ins and payments. Customers book PS units, games, and accessories from a shared cart. Owners pull revenue reports and unit status with one click.

Laravel 12 Tailwind CSS 4 Midtrans Google OAuth MySQL Maatwebsite Excel

BarangBekas.id — Second-Hand Marketplace

Think of it like a digital flea market where everyone is both a shopper and a vendor. List your old stuff with honest condition grades, chat with buyers directly, and build trust through reviews that only actual purchasers can leave.

The smart part — checkout validates stock in real-time and instantly rolls back if payment fails. No overselling, no angry customers. Every payment method works, and everyone gets notified the second something happens.

Laravel 12 Bootstrap 5 Midtrans MySQL Vite Database Sessions

Dapur Roti — Bakery E-Commerce Platform

Most bakeries still take orders through WhatsApp and hope the bank transfer proof shows up. This system gives them a proper online store — customers browse, order, upload payment proof, and watch their order move through four clear stages until it arrives at their door.

The admin side shows exactly what matters — how much revenue came in today, which products fly off the shelf, and how many customers keep coming back. Everything exports to Excel when the boss needs numbers.

Laravel 11 Tailwind CSS 4 Vite 7 MySQL Scramble API Docs

Motorcycle Rental Management

A motorcycle rental shop, fully digitized. Customers browse available motorcycles, pick their dates, and book — all online. Cashiers confirm payments and mark rentals complete with a single click. Admins oversee everything from one clean dashboard.

Every motorcycle has photos, dynamic pricing, and real-time availability. After each rental, customers leave reviews — so future renters can see which motorcycles are the crowd favorites.

Laravel 12 Filament 3.3 Tailwind CSS Alpine.js MySQL Laravel Breeze

Data Analysis & Business Intelligence

Airline Executive Performance Dashboard

Nearly 100,000 international flight records from airports across six continents — and the story they tell is surprising. Flight status splits almost perfectly into thirds: 33.3% on-time, 33.3% delayed, 33.4% cancelled. Passenger demographics are evenly balanced too — 50/50 gender split, ages spread uniformly from 1 to 80+, with North America leading at 32K passengers followed by Asia at 19.6K.

The dashboard surfaces what matters fast — which airports struggle with delays (Santa Maria, Santa Rosa), which ones stay reliable (San Pedro, Santa Ana), monthly traffic swings from 7.9K in February to 8.6K in May, and even which pilots carry the highest cancellation rates. Decision-makers can spot bottlenecks, compare continents, and optimize operations — all at a glance.

Power BI DAX Data Cleaning Data Modeling Exploratory Data Analysis Business Insights Visualization

HR Analytics & Employee Attrition Dashboard

1,470 employees, 16% attrition rate — this dashboard breaks down why people leave and who is most at risk. Research & Development dominates the headcount at 961, but Laboratory Technicians (62), Sales Executives (57), and Research Scientists (47) lead the exit list. Managers and Research Directors earn the most at ~$15K/month, while HR sits at the bottom around $13K.

The dashboard connects the dots between income, overtime, job satisfaction, and attrition — so HR teams can spot flight risks before they walk out the door. Demographics, department breakdowns, promotion timelines, and compensation trends all surface in one view that turns employee data into retention strategy.

Power BI DAX Data Cleaning Data Modeling Exploratory Data Analysis Business Insights Visualization HR Analytics

E-Commerce Sales Performance Dashboard

541,909 raw transaction rows across 8 columns — this is real, messy e-commerce data. Returns, zero-price items, missing customer IDs, bulk wholesale orders. After cleaning it all with Python, the dashboard reveals the full story: 4,373 customers, 25,900 transactions, and 909M in total revenue across multiple countries.

The insights are eye-opening. One customer (ID 136840) drives 54% of all revenue at 142M — a massive dependency risk. DOTCOM POSTAGE tops the product list at 16M. UK dominates sales, but Netherlands and EIRE punch above their weight. Monthly revenue climbs steadily from 52M in January to a December peak, showing clear seasonal momentum.

Python Data Cleaning Exploratory Data Analysis Feature Engineering Business Insights Power BI DAX Data Modeling

Chocolate Sales & Shipment Dashboard

7,905 shipments tracking $44.7M in revenue across six product groups and three global regions. Each row is one shipment — product, salesperson, ship date, box count, and order status. The pipeline breaks down cleanly: 80.4% delivered, 10% placed, 9.6% cancelled.

Milk Bars lead revenue at $14.6M, followed by Eclairs at $10.3M. APAC dominates with 52.8% of all sales — UK, India, and the USA are the top three markets. The Delish team outperforms the rest, and revenue climbs steadily through the year, peaking at $4.5M in July. A fact-table structure built for a data warehouse, ready for deep operational analysis.

Data Cleaning Power BI DAX Data Modeling Data Visualization

HealthScope Indonesia: Analisis Kesehatan Nasional 2010–2024

HealthScope Indonesia is an interactive analytics dashboard built using Microsoft Power BI to visualize and analyze health data from 12 provinces in Indonesia for the period 2010–2024. This dashboard is designed to assist in data-driven national health policymaking. The dashboard consists of four analytical pages: an overview of national health conditions, a comparison of performance across provinces, an analysis of factors influencing mortality rates and life expectancy, and a summary of insights and policy recommendations.

Python Data Cleaning Exploratory Data Analysis Power BI DAX Data Modeling

Machine Learning

Coming Soon

Machine Learning projects are currently in development and will be added soon.

Stay tuned for exciting ML projects including:

  • Prediction Models
  • Classification Systems
  • NLP Applications
  • Computer Vision Projects

Let's Work Together

Have a project in mind or want to discuss potential opportunities? I'd love to hear from you. Let's create something amazing together!

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