DONGJUN J.

🚀 Turning Data into Business Gold Hi, I’m Nelson — a Senior Principal Engineer with 24+ years in IT, specializing in data engineering, cloud architecture, and machine learning. I hold a master’s degree in Computer Science and an MBA, enabling me to bridge deep technical solutions with real business impact. I’m a Google Cloud Certified Professional Data Engineer and AWS Certified Solutions Architect – Professional, with hands-on experience across AWS, GCP, and OpenStack. I’ve led data and ML projects that power critical business decisions. 🔧 What I Do Best 🟨 Data Engineering • Build scalable ETL pipelines using SQL, dbt, Airflow • Work with Redshift, BigQuery, Snowflake, Databricks • Python, Pandas, Spark, Hadoop 🟨 Machine Learning • NLP, Sentiment Analysis, Classification Models 🟨 Cloud Specialist • Infrastructure on AWS, GCP, OpenShift, Ceph • DevOps, CI/CD, Linux, distributed storage systems 🏅 Certifications ✅ Google Cloud Professional Data Engineer ✅ AWS Solutions Architect – Professional ✅ Cloudera Certified Administrator for Apache Hadoop (CCAH) ✅ Red Hat Certified: OpenShift & OpenStack ✅ EMC Information Storage & Management 🧠 Skills Snapshot • Web & social media data analytics • Data modeling, warehousing, and ETL design • Hadoop, Spark, Kafka • Workflow orchestration with Airflow • Cloud-native architecture (AWS, GCP, Azure) • Relational & NoSQL DBs • Secure and compliant data design 📌 Services I Offer • Data pipeline development • End-to-end data architecture design • Cloud-based data solutions • Data warehouse implementation • Big data analytics and batch processing • Data quality and governance strategy 🌟 Highlight: Award-Winning Project 🏆 Best Big Data Paper Award – for using open datasets to predict market trends, recognized at Dell Technologies World. 💬 What Others Say “Nelson is very approachable and always willing to help. Whether it’s software development, big data analytics in the cloud, or ML projects—he delivers with expertise and curiosity.” “He gets things done. Whether it’s open-source tools or custom code on AWS, Nelson solves problems creatively and efficiently.” “Exceptional AWS skills, and incredibly patient. A true professional.” ✅ Why Work With Me I bring a strategic mindset to every project. You won’t just get code — you’ll get solutions that align with your business goals. I’m curious, detail-oriented, problem solver and relentless about delivering results. Let’s collaborate to unlock the full value of your data.