Zsolt Hrepta
Data to Value specialist
Salary / Daily rate
Budapest, Hungary
Freelance, open to permanent contract
Can come onsite
Skills
Languages
About me
Intro
Leveraging experience across diverse technological landscapes, I possess a high degree of adaptability to new environments and complex systems. I excel in high-level code analysis and process modeling, allowing me to bridge the gap between technical constraints and business goals. My passion lies in visual design and transparent communication, ensuring that every development phase is structured, efficient, and creates tangible value. I am driven by the challenge of optimizing workflows to achieve scalable, high-quality improvements.
Work experience
Senior Information Technology Specialist
Nextent Informatics Co.
Feb 2026 - Apr 2026
3 months
Budapest, Hungary
Position: Data warehouse developer (MVM) – Data management framework developement for data vault.
Nextent Informatics Co.
May 2022 - Jan 2026
3 years 9 months
Budapest, Hungary
Senior Information Technology Specialist
Sep 2024 - Jan 2026
1 year 5 months
Budapest, Hungary
Position: Varicent Incentives Compenzation Management - Product Consultant (Magyar Telekom) – Contribution to the implementation of Varicent ICM to replace the previous system. Key contributions: – I have successfully elicited and documented complex business logic, subsequently clarifying and defining comprehensive testing requirements. I actively collaborated with business stakeholders to gather and consolidate their expectations and requirements. – Development and Optimization of ETL (Extract, Transform, Load) Pipelines: Spearheaded the design and implementation of robust and efficient ETL pipelines, ensuring accurate and timely data flow from source systems to the Varicent ICM platform. This encompassed data quality validation and the execution of complex data transformation logic. – Business Logic Development within the Varicent ICM Environment: Expertly developed and configured intricate business logic within the Varicent ICM system, accurately reflecting business requirements and rules. This included the specific setup of compensation plans, performance metrics, and reporting functionalities. – Close Collaboration with the Development Team: Actively participated in team efforts, collaborating closely with other developers on module integration, code reviews, and knowledge sharing, thereby contributing to the project's smooth progression and high-quality output. – Participation in Comprehensive Testing of Developed Features: Played a pivotal role in the thorough testing of developed functionalities and modules, integration, and user acceptance testing.
Senior Information Technology Specialist
May 2022 - Sep 2024
2 years 5 months
Budapest, Hungary
Position: Senior Data Engineer (Magyar Telekom) 2022-2024 – Collaborated with data scientist colleagues to leverage technical log analytics, providing valuable insights to support business operations. Key contributions: – Developed and implemented data-driven solutions that prevented unnecessary call center escalations, improving customer satisfaction and operational efficiency. – Identified and communicated problematic tools to stakeholders, enabling proactive remediation and process optimization. – Contributed to the development of an internal data quality solution. Mentored junior colleagues, accelerating their learning of local API and development regulations. – Contributed to the migration of on-premise solutions to Google Cloud Platform (GCP). Managed the operation of existing solutions (ETL), troubleshooting issues, and optimizing their performance. Used: Python, ETL, Oracle Database, Hadoop, Impala, Apache Parquet, BigQuery, SQL, PostgreSQL, Git, Linux, Jira, Confluence, PySpark, Cloudera, Agile Methodology
Database Developer
eKRÉTA Informatikai Zrt
Apr 2021 - May 2022
1 year 2 months
Budapest, Hungary
As a database developer, I specialized in implementing development requirements, improving performance, and identifying and resolving bugs. My responsibilities included: – Implementing development needs and features. – Enhancing performance through optimization techniques. – Diagnosing and fixing bugs. Used: SQL Server, GitHub, T-SQL, Agile Methodology
Senior Business Intelligence Consultant
Eisdev Business Intelligence
Nov 2020 - Dec 2020
2 months
Data Analyst
DigitDoc Kft.
Jul 2018 - Dec 2020
2 years 6 months
Budapest, Hungary
Worked at EESZT (National eHealth Infrastructure) – Leveraged data analysis and visualization skills to generate comprehensive ad-hoc, weekly, monthly, and daily reports for developers and management, providing actionable insights to drive decision-making. – Spearheaded the design and implementation of a new Oracle-based data warehouse, optimizing data storage and retrieval for enhanced performance and scalability. – Ensured the smooth operation and maintenance of an MS SQL Server-based data warehouse, implementing proactive measures to maintain data integrity and availability. – Developed and modified SSRS reports, automating report generation and distribution to streamline data dissemination and improve stakeholder visibility. – Made the daily error investigations. These based on log data analytics, Power BI visualization and communication with stakeholders. Used: Oracle database, MS SQL Server, Power BI, SSRS, SQL, PL/SQL, T-SQL, Python, SSIS, Excel
Software Engineer
Eisys Kft.
Jun 2017 - Jun 2018
1 year 1 month
Budapest, Hungary
– Develop Oracle and MS SQL Server based financial data warehouses. Used: SQL, Oracle Database, PL/SQL, SQL Server, T-SQL
Data Warehouse Development Specialist
National Toll Payment Services Co. Ltd.
Dec 2015 - Jun 2017
1 year 7 months
Position: Data Warehouse Development Expert – Maintain and improve data warehouse. – Develop ETL scripts in PL/SQL – Manage MongoDB project from idea to go live.
Data Warehouse Developer
Processorg Bl Ltd.
Aug 2014 - Dec 2015
1 year 5 months
Budapest, Hungary
– ETL development and maintain at partner companys. – Oracle and MS SQL Server – SAP Data Services – Cloudera Hadoop labor – Talend – Oracle Data Integrator – MongoDB – Reporting Services (SSRS) – Integration Services (SSIS)
Analyst, Data Warehouse Specialist
allegroup.hu
Sep 2012 - Feb 2014
1 year 6 months
– Collaborated with business stakeholders to define reporting requirements and delivered both standard and ad-hoc reports in an Oracle-based environment. – Contributed to fraud detection and churn analysis by supporting business needs and ensuring data-driven insights. Used: Oracle Database, ETL, SQL, PL/SQL, Excel, MySQL
DBA
SDA Informatika Zrt.
Jan 2012 - Aug 2012
8 months
Budapest, Hungary
– Database migration on Oracle and MS SQL Server. Data cleaning. Support the developer team and the clients.
IT Developer
Eos Faktor Magyarország Zrt.
Apr 2011 - Jan 2012
10 months
Budapest, Hungary
– Maintained and optimized Oracle databases, including loading, cleaning, and integrating data from various sources. – Developed new functionalities and modules using PL/SQL, created complex SQL queries and business reports to support operational and strategic needs. – Performed ongoing maintenance and enhancement of the CRM system, ensuring data quality and system reliability. Used: ETL, Oracle Database, SQL, SQI Loader, PL/SQL, Bash, Linux, Excel
Technical Consultant
Quickborn Consulting LLC
Jul 2009 - Apr 2010
10 months
– Oracle Retail Monitoring in 24/7 with AppWorx and other special applications. – Oracle Retail Support in a team and individual, – tuning, debug and develop SQL, PL/SQL and ksh scripts with SQL Developer and Toad. These systems run Aix operating system. Used: Python, Oracle Database, SQL, PL/SQL, Bash, Ksh, Jira
Education
Eszterházy Károly College
BSc, Computer Science
Licenses & certifications
Advanced Data Engineering with Snowflake
Issued: –
Introduction to Modern Data Engineering with Snowflake
Issued: –
Intro to Snowflake for Devs, Data Scientists, Data Engineers
Issued: –
AI Agents in Your Browser: Boosting Productivity with Gemini in Chrome
Issued: –
Databricks Certified Data Engineer Associate Cert Prep
Issued: –