Experience

넛지헬스케어

• IT System Operations and Maintenance
• 1 - 100 Employee

• Data Analyst

  • Dec 2021 - Jul 2022

  • Substitution of mandatory South Korean Military Service • Worked on 7+ end-to-end data analysis projects for the company's app Cashwalk(DAU: 3000K) and Timespread to drive insights, enable business growth and empower management to make better decisions. • Created Google BigQuery Data Clustering for 2.5+TB daily user data collected from various apps including Cashwalk, Cashwalk US and Timespread for over 2 years. Reduced company costs by $15,000 per month. • Developed an automation… Show more • Substitution of mandatory South Korean Military Service • Worked on 7+ end-to-end data analysis projects for the company's app Cashwalk(DAU: 3000K) and Timespread to drive insights, enable business growth and empower management to make better decisions. • Created Google BigQuery Data Clustering for 2.5+TB daily user data collected from various apps including Cashwalk, Cashwalk US and Timespread for over 2 years. Reduced company costs by $15,000 per month. • Developed an automation Python script to automatically cluster new tables in BigQuery and deployed to AWS EC2. • Performed DynamoDB migrations for more than 100 billion rows. Used Python to efficiently query large-scale datasets and AWS Glue with S3 and Athena for querying certain small tables. • Analyzed root cause for the decline of total user base for multiple Teamwalk challenges, a service launched in 2022.04, and user churning rates to improve user experience in Cashwalk US. • Queried and generated multiple analysis data from MySQL. Preprocessed and cleaned datasets in Python using NumPy and Pandas. Created various exploratory plots to gain preliminary insights with Matplotlib. • Built real-time dashboards in Tableau. Created multiple graphs including bar chart, scatter plot, histogram and bullet graph to highlight key findings. • Wrote various Python scripts to automate data fetching behaviors and calculated metrics such as DAU, WAU, MAU for daily updates in Google Spreadsheets. • Effectively collaborated with functional teams, frequently presented findings for the management level and became the go-to person for resolving data analysis issues. Show less • Substitution of mandatory South Korean Military Service • Worked on 7+ end-to-end data analysis projects for the company's app Cashwalk(DAU: 3000K) and Timespread to drive insights, enable business growth and empower management to make better decisions. • Created Google BigQuery Data Clustering for 2.5+TB daily user data collected from various apps including Cashwalk, Cashwalk US and Timespread for over 2 years. Reduced company costs by $15,000 per month. • Developed an automation… Show more • Substitution of mandatory South Korean Military Service • Worked on 7+ end-to-end data analysis projects for the company's app Cashwalk(DAU: 3000K) and Timespread to drive insights, enable business growth and empower management to make better decisions. • Created Google BigQuery Data Clustering for 2.5+TB daily user data collected from various apps including Cashwalk, Cashwalk US and Timespread for over 2 years. Reduced company costs by $15,000 per month. • Developed an automation Python script to automatically cluster new tables in BigQuery and deployed to AWS EC2. • Performed DynamoDB migrations for more than 100 billion rows. Used Python to efficiently query large-scale datasets and AWS Glue with S3 and Athena for querying certain small tables. • Analyzed root cause for the decline of total user base for multiple Teamwalk challenges, a service launched in 2022.04, and user churning rates to improve user experience in Cashwalk US. • Queried and generated multiple analysis data from MySQL. Preprocessed and cleaned datasets in Python using NumPy and Pandas. Created various exploratory plots to gain preliminary insights with Matplotlib. • Built real-time dashboards in Tableau. Created multiple graphs including bar chart, scatter plot, histogram and bullet graph to highlight key findings. • Wrote various Python scripts to automate data fetching behaviors and calculated metrics such as DAU, WAU, MAU for daily updates in Google Spreadsheets. • Effectively collaborated with functional teams, frequently presented findings for the management level and became the go-to person for resolving data analysis issues. Show less



Toy's Myth Inc.

• Seoul, South Korea

• Data Analyst

  • Jul 2020 - Dec 2021

  • Substitution of mandatory South Korean Military Service • Performed data analysis for various company system integration projects and presented detailed insights. • Analyzed MySQL data collected by the company's smart scanner sensor such as the smartphone MAC id or environmental factors such as humanity or temperature to offer insights regarding visitors and surrounding environments in Korea using Python. Created a live view dashboard using AWS EC2 and Tableau. • Studied and… Show more • Substitution of mandatory South Korean Military Service • Performed data analysis for various company system integration projects and presented detailed insights. • Analyzed MySQL data collected by the company's smart scanner sensor such as the smartphone MAC id or environmental factors such as humanity or temperature to offer insights regarding visitors and surrounding environments in Korea using Python. Created a live view dashboard using AWS EC2 and Tableau. • Studied and predicted the cause of derailments using KORAIL data queried from Oracle to MariaDB. Built Min/Max and Heatmap of the long-term trends of the orbital circuit. Built ML prediction model using scikit-learn. • Fetched and transformed various raw data into JSON API format. Automated process using python and EC2. Show less • Substitution of mandatory South Korean Military Service • Performed data analysis for various company system integration projects and presented detailed insights. • Analyzed MySQL data collected by the company's smart scanner sensor such as the smartphone MAC id or environmental factors such as humanity or temperature to offer insights regarding visitors and surrounding environments in Korea using Python. Created a live view dashboard using AWS EC2 and Tableau. • Studied and… Show more • Substitution of mandatory South Korean Military Service • Performed data analysis for various company system integration projects and presented detailed insights. • Analyzed MySQL data collected by the company's smart scanner sensor such as the smartphone MAC id or environmental factors such as humanity or temperature to offer insights regarding visitors and surrounding environments in Korea using Python. Created a live view dashboard using AWS EC2 and Tableau. • Studied and predicted the cause of derailments using KORAIL data queried from Oracle to MariaDB. Built Min/Max and Heatmap of the long-term trends of the orbital circuit. Built ML prediction model using scikit-learn. • Fetched and transformed various raw data into JSON API format. Automated process using python and EC2. Show less



UC Berkeley College of Computing, Data Science, and Society

• United States
• Higher Education
• 100 - 200 Employee

• Data Science Peer Consultant

  • Jan 2019 - May 2019

  • Hosted weekly consulting session for students who needed technical help with their coursework, research, or personal projects by using Python and Tableau. • Hosted weekly consulting session for students who needed technical help with their coursework, research, or personal projects by using Python and Tableau.



UC Berkeley Electrical Engineering & Computer Sciences (EECS)

• United States
• Higher Education
• 300 - 400 Employee

• CS10 Lab Assistant

  • Aug 2018 - May 2019

  • Worked as a lab assistant for an introductory CS class. • Helped students with course questions regarding Snap! and Python. • Worked as a lab assistant for an introductory CS class. • Helped students with course questions regarding Snap! and Python.