Krisztián is available for hire
Hire KrisztiánKrisztián Orbán
Verified Expert in Engineering
Data Warehousing Developer
Budapest, Hungary
Toptal member since September 15, 2021
Bio
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
Seven Senders
Snowflake, Talend, Looker, ETL, SQL, Data Engineering, Data Warehousing...
OK Solutions Bt.
TensorFlow, Python, Pandas, MQL4, Data Science
Deutsche Telekom
Teradata, Oracle, Ab Initio, SAP BusinessObjects (BO), ETL, SQL...
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
Availability
Part-time
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
2021 - PRESENT
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.
Technologies: Snowflake, Talend, Looker, ETL, SQL, Data Engineering, Data Warehousing, Amazon Web Services (AWS)
Data Scientist
2020 - 2021
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.
Technologies: TensorFlow, Python, Pandas, MQL4, Data Science
Project Manager
2016 - 2020
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.
Technologies: Teradata, Oracle, Ab Initio, SAP BusinessObjects (BO), ETL, SQL, Data Engineering, Data Warehousing, PL/SQL Developer
DWH Developer
2014 - 2016
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.
Technologies: Teradata, Ab Initio, SAP BusinessObjects (BO), ETL, SQL, Data Engineering, Data Warehousing
Report Developer
2011 - 2013
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.
Technologies: Teradata, Oracle, MicroStrategy, SQL, Data Warehousing
Cognos Developer
2010 - 2011
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.
Technologies: IBM Db2, IBM Cognos, QMF, Hyperion, SQL, Dashboard Development
DWH Developer
2008 - 2010
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.
Technologies: Oracle, IBM Cognos, PL/SQL Developer, ETL, SQL, Data Engineering, Data Warehousing, Dashboard Development
Project Coordinator
2007 - 2008
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.
Technologies: Microsoft SQL Server
DWH Support
2006 - 2007
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.
Technologies: Oracle, SAP BusinessObjects (BO), IT Support, SQL, Data Warehousing, PL/SQL Developer
Experience
Teradata to Oracle Migration
I was the development team leader for the Teradata to Oracle migration project. All connected systems (10+) had to change their FTP addresses and directories. This project lasted two years and was a real success.
Education
2001 - 2007
Master's Degree in Information Technology
University of Pannonia - Veszprém, Hungary
Certifications
JUNE 2016 - PRESENT
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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