Calvin Halim
Machine Learning Engineer at Mercari, Inc.
Tokyo, Japan
Summary
👤
Senior🎓
Top SchoolCalvin Halim is a machine learning engineer based in Tokyo with 11 years of experience building production ML platforms and data-driven solutions across companies like Mercari and Rakuten. He has led ML platform and MLOps efforts—designing GCP-based systems using Vertex AI, Kubeflow, MLflow, BigQuery and CI/CD pipelines—and implemented Airflow and Kubernetes executors on in-house clouds to operationalize models for fraud, churn, and content moderation. Comfortable bridging data science and engineering, he has hands-on experience with object detection, FastAPI model serving, and statistical analysis to measure business impact. A lifelong learner who composes electronic and jazz-influenced music, he brings creative curiosity and strong communication skills to collaborative, cross-functional teams.
11 years of coding experience
5 years of employment as a software developer
Full Stack Web Development Certification, Computer Software Engineering, Full Stack Web Development Certification, Computer Software Engineering at Free Code CampMaster of Engineering - MEng, Applied and Cognitive Informatics, 2nd, Master of Engineering - MEng, Applied and Cognitive Informatics, 2nd at Chiba UniversityAssociate’s Degree, Information Technology, Associate’s Degree, Information Technology at Yuge National College of Maritime Technology
Indonesian, Japanese, English, German, Chinese, hokkien
Github Skills (2)
runner2
arduino2
Programming languages (3)
Github contributions (5)
CJHJ/CJHJ
Aug 2020 - May 2026
Contributions:4 pushes, 1 branch in 5 years 9 months
CJHJ/cu-arduino-time-monitor
Nov 2019 - May 2021
A server that monitors lap time log produced by arduino sensor
Contributions:2 reviews, 7 PRs, 11 pushes in 1 year 6 months
arduino
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