Leonard Hartono Email & Phone Number

Jakarta, Jakarta, Indonesia

Key Accomplishments:- Developed a sophisticated user targeting algorithm using double machine learning techniques, resulting in a ~30% improvement in conversion rates.- Designed and implemented a robust credit scoring algorithm that successfully maintained the non-performing loan (NPL) rate at a controlled level of 1%.- Innovated a causal graph-based tool.

• I led the Online 2 Offline (O2O) and Allofresh data science & business intelligence team. The team is responsible for the Mitra Bukalapak, BukaBangunan & Allofresh products. During this period I continued the.
• Personalized recommender system which takes into account the user's purchase and viewing behavior
• Causal inference studies utilizing difference-in-difference, propensity score matching, coarsened exact matching and other methods to generate unbiased impact estimates when experimentation is infeasible
• Scalable & loosely coupled architecture for self-service analytics to ensure that changes will require minimal effort

Greater Jakarta Area, Indonesia

• I led the transformation of the data science team in growth & online 2 offline (o2o) from performing mostly ad-hoc data requests to generating insights that are used by the other teams to improve the business and.
• Churn prediction to improve retention
• Price modeling to determine optimum price points to maximize revenue
• Uplift modeling to optimize telemarketing & cross selling
• Segmentation models for understanding customer acquisition through sales agents
• Causal inference studies on the impact of bad customer experience on retention, increasing number of sales agent on acquisition and others.

Greater Jakarta Area, Indonesia

• Data scientist for the growth team in Bukalapak, responsible for subsidies and digital marketing. Some projects I was responsible for:
• created a model to identify products to be shown for digital marketing resulting in a 90% reduction in products feed (reduce load) while improving the conversion rate by > 50%
• Assessing the effect of flash deal on platform latency resulting in a decision to create a new microservice
• Identify the factors which lead to popular flash deal products to guide product selection in order to optimize the performance

Jakarta, Indonesia

• Evaluate best practice methods and create internal calculation tool to estimate liquid hold-up in oil and gas pipelines
• Presented project results to BP Berau Process Engineers

Houston, Texas

• Lead Engineer in development effort for the next generation subsea pump station over-pressure protection system
• Conduct pressure vessel stress analysis for high pressure subsea pump application per API 6A and ASME VIII Div. 3
• Detailed Engineering and FEED studies for subsea separation and boosting projects
• Create system layout drawings, process flow diagrams (PFDs) and Piping & Instrumentation Diagram (P&IDs)

Brookshire, Texas

• Utilize scaling laws to design pump impeller and diffuser hydraulics
• Select pump hydraulics for specific applications
• Predict pump performance deviations based on model-to-actual comparison
• Design vertical centrifugal pump test lab with flow capacity up to 300,000 gallons per minute and power capacity up to 7,500 horsepower

Brookshire, Texas

• Single phase pressure loss calculations using Reynold’s number and Moody diagram for laminar and turbulent flow
• Design project test set-up to ensure vortices and eddies are minimized at the pump intake
• Calculate impeller diameter using modified affinity laws based on pump specific speed
• Manage test lab equipments and ensure calibration of test instrumentations are done properly
• Ensure performance and NPSH tests are done in a high quality and timely manner

Jakarta, Indonesia

• Internship in the Petroleum Equipment Division at FMC
• Assisted with technical drafting with AutoCAD and Microsoft Visio
• Performed quality control inspections
• Observed equipment manufacturing using lathes, drills, mills, and various other machines

Master Of Science (Ms)

Bachelor Of Science