Георгій

Georgiy Kozak
Scala/BigData Engineer

Summary
I'm a Scala Engineer with a mathematical background and 2+
years of commercial experience, specializing in building
Contacts production ETL/ELT pipelines and back-end services.

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Experience
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Kharkiv, Ukraine 02/2026 - Present

https://t.me/GeorgeKozak Data Engineer | NDA (Fintech)
Developed and maintained production ETL pipelines using Python,
https://github.com/ Airflow and PySpark. Designed and optimized a data warehouse in
GeorgiyKozak PostgreSQL, including schema design and query performance tuning.
[відкрити контакти](див. вище в блоці «контактна інформація») Built BI dashboards in Metabase to support business decision-making.
kozak-942968241
07/2025 - 12/2025
Scala/Big Data Engineer | StackTome
Skills D2C e-Commerce platform
Implemented, deployed and maintained production ETL/ELT
Scala Python pipelines for processing eCommerce data using Scala and Apache
Databases: PostgreSQL, Spark • Implemented complex data transformations with Spark SQL,
using Parquet and Delta tables • Diagnosed and resolved data
MongoDB, MS SQL
quality issues, SQL problems and failing Spark jobs in production •
Typelevel: Cats, Cats Effect, Led a major upgrade of the core data processing module: migrated
Http4s Apache Spark from 3.5 to 4.0 and upgraded the project from Scala
Slick Play Framework 2.12 to Scala 2.13 with aligned dependencies • Integrated multiple
external platforms (Shopify, Trustpilot, Centra, Klaviyo, Google APIs)
Apache Spark AWS S3
via REST and GraphQL • Worked with AWS S3-compatible object
Sbt Git Docker storage using Apache Spark
Jenkins ScalaTest
08/2024 - 07/2025
Munit
Scala Engineer | Center Cruises

Languages • Developed back-end services and APIs for the cruise company’s
website, supporting bookings and customer-facing features •
Implemented data import pipelines for multiple formats (JSON, XML,
English - B2 (upper intermediate)
CSV) ensuring data quality for supplier information • Worked on
integration with internal accounting platform via Protobuf, enabling
Ukrainian - native
automated synchronization of booking and cruise sales data.
Russian - native Developed and maintained website for data display
 09/2023 - 06/2024

Robotics and Programming Teacher | Robot School
Java, Python, Robotics

08/2022 - 08/2023

Scala Engineer | Wolkov Consulting
Developed back-end and web services across multiple client projects:
• Wrote unit and integration tests to ensure code quality and
reliability • Implemented integrations with third-party libraries and
APIs • Assisted team members with their tasks • Participated in code
reviews and technical discussions

08/2021 - 11/2021

Trainee Java Developer l EPAM Systems

Education

Università degli Studi dell'Aquila (Italy)
Master | Applied Mathematics
2023 - 2025

V. N. Karazin Kharkiv National University
Master | Applied Mathematics
2023 - 2025

V. N. Karazin Kharkiv National University
Bachelor | Mathematics and Computer Science

2019 - 2023

Coursera courses:
Big Data Analysis with Scala and Spark
Functional Programming Principles in Scala
Parallel Programming in Java
Software Development Processes and Methodologies

SkillSoft courses:
Getting Started with Apache Kafka
Integrating Kafka with Python & Using Consumer Groups