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Marek ŽákMK
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Marek Žák

@marekk

Data Engineer at RapidSOS who built a scheduled reporting service and optimized a high-volume ingestion pipeline.

Czechia
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At RapidSOS, I designed and built a production, customer-facing scheduled reporting service that replaced a manual workflow with self-service scheduling and automated report delivery. I implemented its Python backend with serverless AWS services.

I developed Databricks pipelines processing tens of millions of records per day and contributed to multi-billion-row data migrations. I also optimized a high-volume ingestion pipeline, cutting peak runtime from about two hours to about 40 minutes.

At IDC, I built a Python library that automated Snowflake table integrations, reducing integration effort by about 70%. I also built and maintained ingestion flows and dbt models, and helped migrate ETL workflows from Pentaho Kettle to Apache Airflow.

Outside my roles, I built and deployed a personal finance app, connecting a Flask backend and PostgreSQL database to a React frontend. I also co-developed Slepicoid, a customer-facing app for finding and contacting local egg farmers.

Experience

Work history, roles, and key accomplishments

RapidSOS logoRA

Software Engineer, Data

Oct 2025 - Oct 2026 (1 year)

Designed and built a production scheduled reporting service using Python and serverless AWS services. Developed Databricks pipelines processing tens of millions of records per day and contributed to large-scale data migrations.

ID

Data Warehouse Engineer

IDC

Mar 2023 - Jun 2025 (2 years 3 months)

Built a Python library to automate Snowflake table integrations, reducing integration effort by ~70%. Developed Snowflake ingestion flows, dbt models, and managed AWS infrastructure with Pulumi.

ID

ETL Developer

IDC

Apr 2022 - Mar 2023 (11 months)

Migrated ~100 ETL workflows from Pentaho Kettle to Apache Airflow on AWS MWAA and built tooling to track migration progress. Maintained daily Python and SQL ETL processes.

SO

Python Developer

SolidSun

Apr 2021 - Aug 2022 (1 year 4 months)

Developed Python automation for solar energy systems, including battery charging control and operational data collection.

Education

Degrees, certifications, and relevant coursework

VŠB – Technical University of Ostrava logoVO

VŠB – Technical University of Ostrava

Studies, Economics & Management

2022 - 2023

Pursued studies in Economics & Management.

SS

SŠ INFOTECH s.r.o.

Maturita, Computer Graphics

2018 - 2022

Completed secondary education with a focus on Computer Graphics, earning the Maturita certificate.

Availability

Looking for a job

Location

Czechia

Authorized to work in

Salary expectations

60k+ USD

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