Jiahong Wang
Data Engineer (external Consultant)
Helsinki, Finland
Summary
👤
Senior🎓
Top SchoolJiahong Wang is a data engineer and consultant with 10+ years of experience building production-grade data platforms and ML-enabled analytics across companies like Wolt, Swappie, Microsoft partners, and Wärtsilä. He designs scalable ETL and warehouse solutions (AWS Redshift, BigQuery, Synapse) and has a track record of migrating legacy systems, optimizing performance, and automating orchestration with Airflow. Equally comfortable in backend development (Python, Django, FastAPI, NestJS) and data engineering (Spark, Kafka, Hadoop), he bridges data science, product and infra to deliver business-impacting features such as churn prediction, LTV/ROAS attribution and partner-facing APIs. Notably, he led Skype’s first XGBoost fraud model and managed a 25-year SAP data migration, reflecting a knack for turning messy, high-stakes datasets into reliable assets. Based in Helsinki, he blends hands-on implementation with a strategic view of cost, performance and operability.
10 years of coding experience
8 years of employment as a software developer
Master’s Degree Science, Master’s Degree Science at TalTech – Tallinn University of TechnologyMaster’s Degree Science, Master’s Degree Science at University of Tartu
English, Chinese, Chinese
Github Skills (85)
crawler10
portable9
gradient9
scalable9
dataflow9
xgboost9
python9
scrapy9
machine-learning9
scraper9
boosting9
java9
crawling9
distributed-systems9
theano9
Programming languages (4)
Github contributions (5)
wangjiahong666/Titanic-Kaggle
Mar 2016 - Mar 2017
Contributions:42 PRs, 185 pushes, 24 branches in 11 months
kaggletechniquespythonsuperviseddisaster
wangjiahong/Expedia-kaggle
May 2016 - Apr 2017
Contributions:26 commits, 25 pushes, 1 branch in 11 months
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