Julius Leo Wijaya
Data Scientist leader and practitioner with over 10 years of experience, solving business problems for Tech and FMCG companies through Advanced Statistics and AI/ML solutions
About me
I’m a Data Scientist with over 10 years of experience in data-related roles from Data Engineering, Business Intelligence, Data Analytics to Data Scientist working in a fast-paced, digitally-oriented environment in Tech companies and FMCG.
I am using Python and Cloud (AWS, Azure, GCP) to develop machine learning solutions, and often do end-to-end product experimentation via A/B Testing or Causal Inference.
My Skills
PRODUCT EXPERIMENTATION
End-to-end product experimentation from experimentation design, impact simulation pre-experiment, statistical testing and post-experiment recommendation
MACHINE LEARNING SOLUTION
Scalable and self-sustain machine learning solutions both supervised, unsupervised using Python, Turicreate, Scikit-learn, and Sagemaker workflow
DATA ENGINEERING/VISUALIZATION
Proficient in Data Engineering from ETL to storytelling with Data through Dashboarding using Python, SQL, and Tableau.
AGILE WORKFLOW
Agile is a repetitive approach to project delivery. Your team delivers multiple smaller steps from the start, instead of delivering everything at the end.
Work Experience
DATA SCIENCE MANAGER
Philip Morris International / Aug 2021 - Present
Leading a team of 5 Data Scientist and 5 Data Analyst, some of the key projects:
Pricing recommendations using Price Elasticity of Demand.
Personalized Product recommendations using collaborative filtering and market basket analysis framework.
Customer churned prediction model and lifetime value using non-negative binomial distribution
Customer Segmentation using K-means clustering.
Product experimentation and hypothesis testing on the new product launch.
Sr BUSINESS INTELLIGENCE
Tokopedia / Sep 2016 - Aug 2018
Pioneering Data Engineering/Business Intelligence team at Tokopedia, some of the key projects:
End-to-end analytical platform from data ingestion, ETL to Executive Dashboard.
Democratize knowledge by creating accessible Datamart and Self-Service Analytics Tool.
Create, own, and manage Datawarehouse implementation using SAS, Python, and GCP
LEAD ECONOMIST (DATA SCIENTIST), Marketplace
GRAB / Sep 2018 - Aug 2021
Leading business and product experimentation related to Marketplace product at Grab, some of the key projects:
Statistical Analysis from Pricing Experimentation using T-Test and ANOVA to set optimal pricing per segment.
Supply sizing forecast using multivariate regression to answer how many drivers we need on a monthly and weekly basis.
Timeseries churn prediction model using Gradient Boosting to do interception and retain drivers with a high probability to churn.
Direct Rollout causal impact analysis using Causal-Inference to isolate the analysis taking into account external factors
BUSINESS ANALYST
Bobobobo/ Dec 2015 - Aug 2016
Working in early stage startup as part of their product/analyst team, some of the key projects:
Create datamart for Corporate Finance and Investor Relations
ETL using Jaspersoft and SQL
Google Analytics
PRODUCT OWNER
Ralali Jun 2015 - Nov 2015
Working in early stage startup as part of their product/analyst team, some of the key projects:
Lead a small team of Software Engineer and Quality assurance by defining the product vision, roadmap, and growth opportunities for Supplier Management System
Collaborate with internal and external contacts to analyze needs and align product roadmap to strategic goals
Develop detailed product feature specifications and ensure they’re clearly understood by relevant teams
Certificates
INFERENTIAL STATISTICAL ANALYSIS WITH PYTHON
University of Michigan / 2023
MACHINE LEARNING: CLASSIFICATION SPECIALIZATION
University of Washington / 2021
MACHINE LEARNING: CLUSTERING & RETRIEVAL
University of Washington / 2021
MACHINE LEARNING: REGRESSION SPECIALIZATION
University of Washington / 2021
MACHINE LEARNING FOUNDATIONS
University of Washington / 2021
Education
MBA, BUSINESS MANAGEMENT
BINUS BUSINESS SCHOOL / 2015 - 2017
BACHELOR, COMPUTER SCIENCE
BINUS UNIVERSITY / 2011 - 2015
”Leo was a cheerful person and like a glue to our team. He cares about his team as much as his responsibilities to the team. He's willing to go far if needed. ”
- Victor Setya, VP of Data at Tiket.com
”I was surprised by his understanding not only about the technical stuff but also how the business works as well. His ownership attitude made him do a lot of awesome things outside his scope, He's willing to learn, research, and share his knowledge, to build a better team and better product”
- Arviddree Sanjaya, Data Analyst at Love, Bonito
WHAT THEY SAID
”It’s rare to find a standout talent like Leo. He is very expert in the field of analysis, from identifying problem statements, verify with data, propose solutions, and can easily conclude the silver lining of many complex problems. I was particularly impressed with Leo’s ability to handle tough Users - effortlessly.”
- Yupita, Manager Strategy Operations at Koinworks
”Julius is a fast learner, open-minded, energetic, smart, self-managed, team work oriented. He shows a very good sense of ownership of the product. I definitely would like to work with him again anytime in the future.”
- Eben Haezer, Head of Engineering at Sinarmas