Building Data
Systems That Bring
Value
I’m Josi Aranda, a Principal Data Engineer focused on building data platforms that reduce cost, increase reliability, and actually help the business move faster — not just look good on diagrams.
2016
Experience
Macromill Inc.
Apr 2025 - Present
Fukuoka, JP
Principal Data Engineer
Designed and led a new BigQuery-centric lakehouse platform, migrating from a legacy Athena + S3 setup. Built and operated large-scale CDC pipelines using Debezium, Pub/Sub, and Dataflow. Established data modeling and schema evolution standards across bronze, silver, and gold layers. Designed and maintained Terraform-based multi-cloud infrastructure (GCP & AWS), while leading performance testing, observability, and cost optimization in collaboration with SRE and platform teams.
tiket.com
Apr 2022 - Apr 2025
Jakarta, ID
Principal Data Engineer
Designed and implemented a scalable and automated data architecture to support rapid business growth. Cut infrastructure and ingestion costs by up to 75% across multiple projects. Built a self-service pipeline generation framework using Airflow, dbt, and internal tools, reducing pipeline delivery time by up to two man-days. Consolidated Airflow clusters, saving up to 50% of operational cost while maintaining reliability.
tiket.com
Nov 2018 - Apr 2022
Jakarta, ID
Data Engineer Lead / Data Engineer
Progressed from Data Engineer to Lead, owning data retrieval, storage, and distribution. Designed and implemented a scalable BigQuery-based data warehouse. Maintained 99% uptime for services running on GKE. Conducted early research and implementation groundwork for Airflow and dbt adoption. Built custom Apache NiFi processors and contributed to internal microservices (React + Golang) for the data team.
Bukalapak
Sep 2018 - Nov 2018
Jakarta, ID
Data Analyst
Despite the short duration due to the role not aligning with my long-term passion, I gained valuable experience in contributing to data-driven decision-making processes. I was responsible for collecting, analyzing, and interpreting data to provide insights and support strategic decision-making within the organization. The role involved gathering and cleaning data from diverse sources, applying statistical methods to uncover trends and patterns, and preparing comprehensive reports.
tiket.com
Oct 2016 - Sep 2018
Jakarta, ID
Data Wrangler
Responsible for managing and analyzing data to extract valuable insights and support business decision-making.
The Tool Box
The
Tool
Box
Daily driver. Pipelines, automation, glue code, one-off scripts that somehow become production. If it moves data, Python is probably involved.
Certifications
Professional Cloud Architect
Google Cloud • Valid until February 1, 2028
Professional Data Engineer
Google Cloud • Valid until December 12, 2027
Data Streaming Engineer
Confluent
DAG Authoring for Apache Airflow 3
Astronomer
Apache Airflow 3 Fundamentals
Astronomer
Apache Airflow 2 Fundamentals
Astronomer
Terraform Authoring and Operations Professional
HashiCorp
Raves & Reviews
“Josi was our first principal level hire to lead the transformation of our data culture in Macromill. Josi was the perfect candidate to bridge the gap we had. He then took ownership of the architecture and implementation; worked with experienced data engineers to setup standards to scale operations; and even went beyond to set it up for other system team's due their lack of capability and time.”
Jer Wei Yeoh
Engineering Manager, Macromill Inc.
“His versatility and technical depth made him a reliable go-to person for complex problems. Josi was also a great team player—collaborative, proactive, and always willing to step in where needed.”
Victor Setya
VP of Data, tiket.com
“Josi is a valuable team member, he will always find a way to solve any technical problems. Not only an independent learner, but he also keen to share his knowledge to other people. Working with him has been a pleasure, can't wait to work with him again.”
Maria Tjahjadi
Head of Data Engineering, Philip Morris Intl.
“Josi is a very versatile data engineer with deep knowledge in infrastructure and data pipeline technology. He transformed our data pipelines into pipelines with high degree of automation. He also managed to migrate our large Airflow clusters to save a lot of cost. Overall, he is a great peer whom I enjoyed working with.”
Fari Q. Andana
Senior Data Engineer, Mindvalley
“Josi is not only fast and highly skilled, I’ve watched him grow and evolve, moving from a backend engineer to data operations, and eventually transitioning to data infrastructure. This remarkable journey highlights his dedication, adaptability, and technical expertise. I wholeheartedly recommend Josi for any future opportunities!”
Dicky A. Hartanto
Head of Data, tiket.com
“Josi was my mentor when I was an intern at tiket.com. His expertise in Data Engineering and Infrastructure significantly affect the smoothness process of the migration. His guidance and mentorship enhanced my professional growth as a Data Engineer.”
Raffi F. Utama
Data Engineer, Samsung R&D Institute Indonesia