Roey Tech

Backend and Data development

תל אביב-יפו, ישראל

פרילנסר

צור קשר

אודותינו

Hello!
I'm Roey, an experienced freelance Data Engineer with over 5 years of hands-on experience designing and building scalable data systems using Python, PySpark, SQL, and big data tools on AWS and Azure.

I specialize in:
• Developing ETL/ELT pipelines using PySpark, SQL, and Databricks
• Migrating and modernizing legacy data workflows in cloud environments
• Building data lake and DWH architectures for analytics and BI teams
• Delivering clean, maintainable, and performance-optimized data pipelines
• Backend and Python API development for data-intensive applications
• Python SDK development to simplify internal and external integrations

I've successfully delivered solutions across banking, SaaS, and defense sectors — helping teams build robust infrastructure, reduce data friction, and gain deeper insights.

Currently open to remote freelance opportunities.
Let’s collaborate to build fast, reliable, and scalable data systems.

שפות

עברית

שפת אם

אנגלית

שליטה קרובה לשפת אם

תחומי התמחות

תכנות ופיתוח תוכנה

300 ₪ לשעה

מתכנת, פיתוח תוכנה כללי

Backend development experience expecially with Python

DB - PostgreSQL

Development on multiple services with different SQL Database

BI, Data Science, Big Data

Experience with SQL, Pyspark, AWS / Azure Cloud tools
Python development for big data processes or complex SQL Development.

Python

Python API and SDK development

משחקים, פיתוח משחקים

private experience in developing games in unity

API, REST, SOAP

Developing self projects with python and rust

מפתחי Back-end

Python backend development

נסיון תעסוקתי

ינואר 2025 - היום

Freelance Data engineer and Backend Developer

roeytech

Collaborating with clients to understand their data needs and provide tailored solutions.
Implementing ETL processes using Python, PySpark, and SQL to transform and load data into data warehouses.
Optimizing existing data workflows to improve performance and reduce costs.
Providing E2E data solutions, including architecture design and implementation.
Utilizing cloud platforms (AWS, Azure) for data storage and processing.
Helping clients to understand the potential of their data and how to leverage it for business insights.

אוגוסט 2024 - ינואר 2025

Data Engineer

Bank Hapoalim, Tel Aviv, Israel

Led E2E Data Lake operations on on-prem servers with Python and PySpark.
Migrated intricate SAS queries to optimized SQL queries for PySpark.
Developed robust, reusable ETL pipelines for seamless data migration within the Data Lake using SQL and PySpark.
Created advanced Python modules to read, update, and overwrite Parquet files based on dynamic parameters and constraints.
Designed Python classes to efficiently retrieve critical data from the Data Lake for various modules.
Managed and maintained CI/CD pipelines using Jenkins for streamlined deployment and integration.

יולי 2022 - יולי 2024

Data Engineer

MatrixDnA , Israel - Kefar Saba

Led and executed E2E data solutions across diverse industries and cloud environments (AWS, Azure) and on-premise setups.
Designed and deployed new DWH structures in SQL (Oracle, MSSQL, PostgreSQL) and Python.
Developed ETL pipelines with Spark, Glue, Lambda, S3, Athena (AWS) and Azure Data Factory, Databricks, MSSQL, Azure
Storage.
Performed data normalization for BI systems and DWH using PySpark and Pandas.
Migrated legacy Python scripts and pipelines to cloud environments (AWS, Azure).
Architected ETL pipelines for Delta Lakes, integrating multiple data sources (Azure Delta Lake, Oracle, SQL Server).
Built SQL procedures for ETL processes in MSSQL.
Managed data migration pipelines in Azure Databricks using PySpark and Spark.
Designed BI solutions from DWH to dashboards.
Created bundled Python executables with PyInstaller.