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Business Intelligence Data Warehousing Linux MySQL Pentaho
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$80 USD / hour
sofia, bulgaria
$80 USD / hour
It's currently 7:23 PM here
Joined January 14, 2011
1 Recommendation

Veselin Z.


4.8 (7 reviews)
$80 USD / hour
sofia, bulgaria
$80 USD / hour
Jobs Completed
On Budget
On Time
Repeat Hire Rate

Data Warehouse Architect

I am a Data Warehouse (DWH) expert with solid knowledge and proven experience. I have 12+ years within the Business Intelligence (BI) field and I've worked on a different type of DWH projects: from small ones to medium sized and large scale solutions. My core competences are DWH and ETL design and implementation, but I have no fear to create complex charts and dashboards. Over the years I've gained experience of various DWH/ETL/BI tools and technologies like: Teradata, Oracle, MS SQL Server, Pentaho BI, Microsoft BI (SSIS, SSAS, SSRS), and many others. I'm looking for challenging DWH, ETL or BI projects.
Freelancer Business Intelligence Analysts Bulgaria

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Portfolio Items

This is a design of database which is part of data testing framework. Tables structure can handle different types of test cases, stores the parameters of the case, outcome of the test case as well as the data validation results.
  Test cases are written on SQL and executed via a custom made engine leveraging Pentaho Kettle as test engine.

Key technologies:
Data Testing Framework
Files Crawler is tool developed using Pentaho Kettle and serves as an entry point for the data processed. It could automatically download files from several different sources - ftp/sftp servers, direct http requests, emails and etc. Status and progress of the files being downloaded is tracked into a supporting database.

Picture shows the jobs that handles the emails extraction.
Files Crawler
Intelligent Trader is a retail decision support tool, which goal is to facilitate and optimize the actions taken by the owner of online business when trying to maximize the trading profit.
Project is developed using the Pentaho BI technologies, MySQL and Infobright databases and Mondrian as an OLAP provider. It has staging area for the data, where later is cleansed and aggregated, data warehouse area using Infobright DB as storage and OLAP cube has 5 fact tables, 7 dimensions and about 180 metrics.

The picture shows sample loading of a fact table.

Key technologies:
 Pentaho BI 4.x,
 MySQL 5.x,
 Infobright 3.x,
 Liferay Portal 4.x
E-commerce Data Warehouse


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Showing 1 - 5 out of 6 reviews
Filter reviews by: 5.0
€540.22 EUR
It was a great pleasure to work with Veselin He has a lot of experience in the whole area of BI, ETL and DWH. He will be on my list if i start the next one. [07 August, 2018] everything best !
Linux MySQL Pentaho Data Warehousing
+1 more
User Avatar
Flag of Christian D. @christiandollfus
5 years ago
$664.93 AUD
Vesko (veselin Z) quickly picked up what I needed and delivered 100%. He not only fixed my Pentaho issues, but also provided excellent guidance on a few mysql & linux issues that were impacting performance. Very happy with the outcome.
Linux MySQL Pentaho
Flag of Matt H. @matt176
5 years ago
$75.00 USD
He is kind, and He is honnest. so He is very very good workers
Business Intelligence
Flag of Akio I. @chanpeter
5 years ago
€60.00 EUR
Quick and good, nice to work with. Very helpful.
Flag of Marian R. @mritter3
6 years ago
$446.80 USD
Veskojl completed a complex task in setting up and developing reports in Pentaho BI. Communication went smooth and business understanding was excellent. My recommendations.
Data Warehousing Business Intelligence
Flag of Michael R. @michaelringkvist
6 years ago


BI Architect

Nov 2014 - Nov 2016 (2 years)
Smart IT ( is a Bulgaria based financial company, specialized in the consumer financing and personal loans. My role as a BI Architect was to gather, review and compile all of the business requirements, as well as to translate these requirements to technical tasks and finally implement a Proof of Concept (PoC) version of the Data Warehouse.

Business Intelligence Developer

Xentio Ltd.
Apr 2012 - Apr 2014 (2 years)
Xentio Ltd. ( is a Bulgarian based company that provides outsourcing and business analytics solutions. My role as a senior developer was to enhance and improve the Data Warehouse as well as the ETL process responsible for the data loading. Another focus of the position was to maintain the Cognos BI part of the project.

Business Intelligence Developer

eCommera Ltd.
Jan 2011 - Jan 2012 (1 year)
eCommera Ltd. is UK based company which provides e-commerce solutions Intelligent Trader is decisions support tool which goal is to optimize performance and profit your online business. I was part of the Data Warehouse team, which role was to extract, cleanse and store trading and web analytical data from third party providers. The ETL has been developed with Pentaho and MySQL as a storage. DWH contains 7 cubes and about 180 measures, built on top of an Inforbright database.


Bachelor of Engineering

Technical University Sofia, 2001 - 2005
(4 years)

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Top Skills

Business Intelligence 6 Data Warehousing 5 Linux 4 MySQL 4 Pentaho 4

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