Jonathan Reynaldo

Make your data more
for you.

Hi, I'm Jonathan Reynaldo — an experienced data engineer with 5 years across industries including Finance and Banking. Ready to turn your messy data into valuable potential.

About

Jonathan Reynaldo

A data engineer from Indonesia with experience across enterprise tools, open-source data stacks, and data services that had me writing whole scripts and packaging them into containers. I design data flow systems and ship them to production, then make sure they don't break and wake me up at 3am. I like exploring anything around data engineering and ML/AI.

Powered by coffee, memes, and the occasional round on my low-level Clash of Clans base.

Based
Jakarta, Indonesia
Stack
PythonSQLSparkFlinkKafkaAirflowdbtTalendPostgresBigQueryDockerKubernetesAlibaba CloudHugging FaceOpenclaw

Experience

Now2019

Senior Data Engineer

BCA Digital
Current2026 — Now

Developed and ran the ingestion in both directions — digital analytics platform into the on-prem warehouse, and the warehouse out to a cloud data platform for personalized marketing. Currently building the lakehouse alongside it, self-hosted chart by chart on Kubernetes instead of a packaged distro. Stay tuned!

Data Engineer

BFI Finance
2023 — 2026

Developed and ran the batch and real-time CDC pipelines behind company's debt collection, negative-list detection, and anti-fraud, on Alibaba Cloud with Kafka, Flink, Airflow, and Alibaba ODPS.

Analytics AI Engineer

Intiva.id
2025

Built Lena, an AI meeting assistant that transcribes and summarizes conversations — fully offline on local models, or against hosted OpenAI. You can read the details here.

Data Engineer Mentor

dibimbing.id
2024

Started as Data Engineer Instructor on Bank Negara Indonesia (BNI)'s corporate training in Docker and Airflow. Then giving back with mentored 20 students through the MSIB Kampus Merdeka program, teaching data engineering including SQL, Python, ETL, data ethics and governance.

Data Engineer

Astra Graphia Information Technology
2021 — 2023

Started as a Python Developer Bootcamp mentee. As a part of Astra International outsourced employee, built the PySpark ETL and Airflow pipelines behind Toyota sales and distribution analytics and Isuzu workshop churn on Cloudera.

Data Scientist Volunteer

Calonin Project
2020

Trained ANN sentiment models on social media chatter and built the Metabase dashboards local election candidates used to steer their campaigns.

Data Engineer & Front-End Intern

Astra Graphia Information Technology
2019

As an intern on the mySights team, I built the data API behind OpinionMining and the ReactJS front end for BPC User Management.

Selected Projects

Diagram: Document to Table

Document to Table

Built a real-time pipeline and the transform service behind it, turning document-store records into schema-defined tables for analysis.

FlinkKafkaPython

Writing

This is where I'll write.

2026-09-10
Data Engineering5 min

Built a Crypto Event Streamer using CCXT: RabbitMQ (Part 1)

DISCLAIMER!!! This is not a trading quant system and not a financial article!!! This is only my personal project for learning how the data streaming event works. Use with caution!

↗