Vladimir Jednak
Verified Expert in Engineering
Software Developer
Vladimir has over a decade of experience in business intelligence, databases, data warehouses, reporting solutions, development, architecture, and consultancy; including having worked on the complete lifecycle of BI/DWH solutions. Vladimir is passionate about database optimization and query tuning and is constantly searching for ways to improve processes.
Portfolio
Experience
Availability
Preferred Environment
Cognos 10, QlikView, SQL Server Integration Services (SSIS), Microsoft SQL Server
The most amazing...
...project I've done is a CDC (change data capture) solution created in SSIS.
Work Experience
Power BI Expert
Fortune 100 North American Construction Equipment Manufacturer (via Toptal)
- Created interactive dashboards and reports in Power BI. Created advanced measures using DAX language.
- Worked on data manipulation using Power Query. Created star schema as a reporting model.
- Used data sources for Power BI: Oracle database, Excel files, Google Analytics.
Data Warehouse Architect
Spartan Race Inc (via Toptal)
- Created a DWH model using the Data Vault model.
- Created a data mart model for reporting with the star schema.
- Wrote ETL/SQL scripts.
- Created metadata tables for configurations and mapping tables for data load and calculations.
- Developed visualizations with Looker.
Business Intelligence Consultant
DataClue GmbH (Freelance)
- Created a data mart model for financial reporting.
- Developed ETL/SQL procedures.
- Developed visualizations with Power BI and DAX calculations.
- Implemented time comparison calculations, and calculations for quantity, product mix, and price impact on revenue and material costs.
Business Intelligence Solution Manager
SR Technics Services
- Developed BI solutions with QlikView and SAP Bex Tools.
- Followed and enhanced SAP BW and QlikView load procedures.
- Monitored and upheld data quality in SAP BW and QlikView process.
Freelance Senior SQL Developer
Datasport, Ltd. (via An Online Freelance Agency)
- Wrote an SQL ranking calculation algorithm of athletes in competitions.
- Optimized the database and query tuning.
- Provided SQL support for live events.
Freelance Senior BI Developer
Multibase (via An Online Freelance Agency)
- Developed and enhanced BI solutions.
- Wrote reports using Microsoft Reporting Services and Microsoft Excel.
- Implemented a DWH system using the data vault model.
Senior Officer | DWH and BI Architect
Addiko Bank a.d. Beograd
- Implemented a banking data warehouse and reporting system (Temenos T24, Informatica PowerCenter ETL, and Cognos).
- Credited and deposited a portfolio and other analytics reports with a market interest method calculation for the financial control department.
- Managed and architected the HBSE retail risk data infrastructure, including the risk data mart and reporting.
- Developed the COGNOS planning tool for the risk department.
- Implemented dimensional and data (Erwin) modeling.
- Defined the models (data warehouse and data mart designs).
- Worked on ETL development (SSIS and Informatica PowerCenter), including reporting and ETL automation and optimization.
Senior BI Developer
IT Excellence
- Optimized the ETL process (SSIS) and developed automated SSIS packages.
- Developed a CDC (change data capture) system and surrogate key architecture.
- Improved the ETL and SQL calculations execution time.
Independent Software Developer
Asseco SEE
- Implemented a risk management application: IK Banka Zenica, Sinergija Banja Luka.
- Built an anti-money laundering module and a provision calculation application for Investiciono Komercijalna Bank Zenica, Bosnia and Herzegovina.
- Developed and implemented a past-due scoring category for Univerzal Banka Beograd, Procredit Banka.
- Wrote the reports for several domestic banks: Komercijalna Banka Beograd, Privredna Banka Beograd, Marfin Banka, Univerzal Banka, Agro Banka, and more.
BI Software Developer
Asseco SEE
- Developed a business intelligence system for several banks in Serbia and Macedonia.
- Wrote reports using Microsoft Reporting Services (SSRS) and Microsoft Excel.
- Modeled, designed, and implemented a system to automatically generate reports.
- Tested reports with the business section of the banks.
- Provided support to the IT and business sections of the banks.
Experience
DWH/CDC Project
https://www.youtube.com/watch?v=ivr_u0wFMMoSkills
Languages
SQL, T-SQL (Transact-SQL), Stored Procedure, Power Query M
Tools
IBM Cognos, Microsoft Power BI, SQL Server BI, Power Query, Looker, BEx Reporting, SSAS
Paradigms
Database Design, Business Intelligence (BI), Database Development, ETL, ETL Implementation & Design, OLAP
Platforms
Microsoft BI Stack, QlikView, Azure
Storage
PL/SQL, SQL Server Integration Services (SSIS), ANSI SQL, SQL Performance, Databases, SQL Stored Procedures, SQL Views, SQL Functions, Database Modeling, SQL Server Reporting Services (SSRS), SQL Server DBA, OLTP, Microsoft SQL Server, PostgreSQL, SQL Server Analysis Services (SSAS), IBM Db2, Azure SQL Databases, Azure SQL
Other
Cognos 10, PL/SQL Tuning, Query Optimization, Data Visualization, Data Warehousing, Data Warehouse Design, Requirements & Specifications, MCSE | Business Intelligence, ETL Development, BI Reports, Data Reporting, Reporting, Reports, Qlik, Data Engineering, Data Modeling, DAX, Star Schema, SAP Business Warehouse (BW), SAP, Tools, Azure Data Factory
Education
Master's Degree in IT (Information Systems and Technology)
University of Belgrade - Belgrade, Serbia
Bachelor's Degree in IT ( Information Systems and Technology)
University of Belgrade - Belgrade, Serbia
Certifications
Microsoft Certified: Azure Data Fundamentals
Microsoft
Microsoft Certified: Azure Fundamentals
Microsoft
Microsoft Certified: Data Analyst Associate
Microsoft
Google Cloud Certified — Associate Cloud Engineer
Google Cloud
Automation Anywhere Certified Advanced RPA Professional
Automation Anywhere
Microsoft Certified IT Professional: Database Developer 2008
Microsoft
Microsoft Certified IT Professional: Business Intelligence Developer 2008
Microsoft
Microsoft Certified Technology Specialist: SQL Server 2008, Database Development
Microsoft
Microsoft Certified Technology Specialist: SQL Server 2008, Business Intelligence Development and Maintenance
Microsoft