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Kr Za

@krza

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Data Engineer at Up Hellas building reliable data pipelines, a 100+ model warehouse, and a payments service.

Greece

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At Up Hellas, I built and maintain a PostgreSQL data warehouse with dbt and Airflow, with 100+ models serving reporting and downstream teams.

I also developed an Apache Spark pipeline that loads transactional data into a ClickHouse warehouse daily, and built a FastAPI payments service that generates unique payment references and triggers downstream internal jobs.

At EY - Aqurance, I led a multi-month migration of a healthcare non-profit’s CRM data into Veeva CRM, restructuring and cleaning legacy data. I also built ETL jobs from Salesforce into MySQL databases to feed Power BI reporting.

I designed and delivered 30+ Power BI dashboards for pharmaceutical clients and wrote Python scripts to automate recurring Salesforce and CRM processes. I bring a BI foundation to data engineering, starting with the end user’s business questions.

Experience

Work history, roles, and key accomplishments

Current

Analytics Engineer

Current

Up Hellas

May 2025 - Present (1 year 5 months)

Built and maintain a PostgreSQL data warehouse with dbt and Airflow, with 100+ models serving reporting and downstream teams. Developed an Apache Spark pipeline for large-scale transactional data into ClickHouse, and built a FastAPI payments service.

PostgreSQL DBT Airflow Apache Spark Clickhouse fastAPI ETL Data Warehouse Python SQL

Data Engineer

EY - Aqurance

Oct 2024 - May 2025 (7 months)

Led a multi-month migration of a healthcare non-profit's CRM data into Veeva CRM, restructuring and cleaning high volumes of messy legacy data. Built ETL jobs extracting data from Salesforce into MySQL for Power BI reporting.

VeevaCRM Salesforce MySQL Power BI ETL Python Data Migration

BI Analyst

EY - Aqurance

Apr 2021 - Oct 2024 (3 years 6 months)

Designed and delivered 30+ Power BI dashboards for multiple pharmaceutical clients. Wrote Python scripts automating recurring Salesforce and CRM processes, saving the CRM department hours of manual work.

Power BI Salesforce Python CRM Data Visualization