Krisztián Orbán
Verified Expert in Engineering
Data Warehousing Developer
Budapest, Hungary
Toptal member since September 15, 2021
Krisztián is a DWH developer with more than 10 years of experience, mainly in Teradata and Oracle. He has used a couple of ETL tools like Ab Initio, Informatica, PL/SQL, and Talend, as well as a couple of BI tools like SAP BusinessObjects, Cognos, and MicroStrategy. Krisztián has three years of project management experience and is interested in data science and machine learning.
Portfolio
Experience
- SQL - 15 years
- Data Warehousing - 12 years
- ETL - 10 years
- Teradata - 9 years
- PL/SQL Developer - 8 years
- Oracle - 8 years
- Ab Initio - 4 years
- Talend - 1 year
Preferred Environment
Oracle, Teradata, IBM Cognos, Talend, Ab Initio
The most amazing...
...experience I have acquired is the wide range of DWH and BI development, in addition to the project management experience.
Work Experience
Data Manager
Seven Senders
- Loaded the source files into DWH to create and validate the invoices.
- Developed Talend jobs to automate the invoice creation process.
- Optimized the processes in the Talend ETL environment.
Data Scientist
OK Solutions Bt.
- Built a model based on artificial intelligence to trade on the forex market.
- Selected features and built and optimized classifiers using a machine learning algorithm.
- Developed a connection between Metatrader and an AI model to be able to communicate with each other.
Project Manager
Deutsche Telekom
- Led the DWH development and system test team (10-12 people).
- Developed Ab Initio ETL processes to load the data from source systems into the DWH.
- Managed the development team in the migration from Teradata to Oracle.
DWH Developer
Deutsche Telekom
- Developed ETL processes based on the requirements of the business's users.
- Coordinated the Hungarian colleagues on the project.
- Interviewed candidates for the developer or system test role.
Report Developer
Telenor Hungary
- Developed reports with SQL to answer business-relevant questions.
- Created ETL processes in Teradata to load and transform the source data into the DWH.
- Rewrote Oracle SQL script to have a better execution time.
Cognos Developer
IBM
- Migrated new and existing Hyperion and Excel reports into Cognos.
- Created a data model in the Cognos framework manager and reports in Report Studio.
- Interviewed candidates from Hungary and India for the project.
DWH Developer
Magyar Telekom
- Developed the Oracle DWH with PL/SQL to load the data from the source systems to the DWH.
- Created Cognos reports based on the requirements of the business's users.
- Rewrote PL/SQL scripts to have a lower execution time.
Project Coordinator
Nextent | UNION Vienna Insurance Group
- Coordinated the implementation of the SAP interface project.
- Managed the tasks between the Softec consulting team and the business's users.
- Collected and transformed the results from the users to the IT company.
DWH Support
General Electric
- Supported the DWH users with specific access to their data mart.
- Fixed bugs in the BusinessObjects Data Integrator (ETL).
- Created reports in the BusinessObjects and scheduled as requested.
- Participated as a member of the test team in a significant DWH migration.
Experience
Teradata to Oracle Migration
Education
Master's Degree in Information Technology
University of Pannonia - Veszprém, Hungary
Certifications
Data Science
Kürt Academy
Skills
Libraries/APIs
TensorFlow, Pandas
Tools
IBM Cognos, Ab Initio, QMF, Hyperion, Looker
Languages
SQL, MQL4, Python, Snowflake
Paradigms
ETL
Platforms
Oracle, Talend, Amazon Web Services (AWS)
Storage
PL/SQL Developer, Teradata, Microsoft SQL Server, IBM Db2
Other
Data Warehousing, Data Engineering, SAP BusinessObjects (BO), IT Support, Data Science, MicroStrategy, Dashboard Development
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