Marian Paul, Data Migration Developer in Pezinok, Bratislava Region, Slovakia
Marian Paul

Data Migration Developer in Pezinok, Bratislava Region, Slovakia

Member since August 15, 2016
Marian is a senior developer and designer of data migrations and back-end solutions. He has Oracle SQL and Microsoft SQL expert certifications. His focus lies in data analysis, consolidation and cleansing, processing large volumes of data, and database performance tuning.
Marian is now available for hire




Pezinok, Bratislava Region, Slovakia



Preferred Environment

Windows, Java, C#, Oracle PL/SQL, Oracle SQL, T-SQL, Microsoft SQL Server

The most amazing...

...project I've contributed to is a multi-national data migration into a centralized Salesforce CRM solution for a global power and automation company.


  • Data Migration and Back-end Programmer

    2013 - PRESENT
    Accenture Slovakia
    • Transitioned local legacy B2B CRM solutions for The ABB Group, Switzerland, into one global Salesforce application. Designed and developed the migration solution and performed data migrations. Tech: MS SQL, Oracle, and Salesforce, C#. Reach: 67 countries, 1.6M business accounts, and 20k Salesforce users. Role: Technical leader of team of 6 developers.
    • Performed a Salesforce data migration for global pharmaceutical company QIAGEN GmbH. Transitioned a legacy global B2B CRM solution into Salesforce. Tech: MS SQL, Salesforce, C#, and PowerShell.
    • Customized a packaged Rating and Billing Manager system by NetCracker (formerly known as Geneva or Infinys) for T-Mobile Poland. Led an international team of developers. Oracle DB, PL/SQL, SQL, Unix shells, and Java.
    • Migrated data of 6 countries for Nestle into a centralized Salesforce consumer relationship management solution. Migrated data of 5M Germany consumers into a centralized custom MDM solution. Cleansed and deduplicated data for customers. Tech: MS SQL T-SQL, C#, MS SSIS, and Java.
    Technologies: Java, C#, Salesforce, Microsoft SQL Server, Oracle
  • Data Migration and Back-end Programmer

    2007 - 2013
    Softec Slovakia
    • Did configuration testing of the product catalog in Siebel CRM and Infinys billing system for T-Mobile Slovakia. Oracle PL/SQL.
    • Designed, built, and executed data migration and consolidation of 79 district databases into one centralized database, a part of a large e-government program, for the Ministry of Labor, Social Affairs, and Family of the Slovak Republic. The migration covered 100 GB of data and 5M subjects in total. Tech: Oracle RAC 11g2, Oracle SQL, and PL/SQL.
    • Built the back-end for a reference data management and master data management system and integration with core banking system for ING Bank N.V, Slovakia. Tech: MS SQL Server 2008.
    • Designed and developed batch data imports and synchronization of customer data into the front-end system from a variety of subsystems, namely MIDAS, for Volksbank Czech Republic, Slovak Republic. Designed and built the back-end of a payment processing system. Integrated with MIDAS. Tech: Java, DB2, MySQL, AS400, AIX, MS SQL, Oracle PL/SQL, and integration with the Java front-end.
    • Implemented data pumps (ETL) over the core policy system UNIUS in Oracle SQL for insurance company Allianz Slovakia. Did SQL performance tuning.
    Technologies: Java, Microsoft SQL Server, Oracle
  • Back-end Programmer

    2003 - 2007
    Accenture Slovakia
    • Deployed a new Siebel CRM and Geneva billing solution for a Bulgarian telecom. Led a team of developers, customized the Geneva billing system, and implemented interfaces. Tech: Oracle PL/SQL, C++, Unix shells, and VB.
    • Led a team of data migration developers for a Slovak telecom company. Made Siebel CRM data migrations, customized the Geneva billing system, and implemented interfaces. Tech: Oracle PL/SQL, C++, Unix shells, VB, and Siebel AIM.
    Technologies: Siebel, C, C++, Unix, Oracle
  • Windows Programmer

    2002 - 2003
    Microstep HDO Slovakia
    • Built Windows CRM/ERP applications.
    Technologies: C++, Oracle
  • Windows Programmer

    2001 - 2002
    Partnersoft Slovakia
    • Built CRM/ERP applications for Windows.
    Technologies: C++, Microsoft Access


  • Migrate Legacy Data Without Screwing It Up (Publication)
    Nobody wants to leave valuable customer data behind. Unfortunately, though, the hardest part of data migration to a complex CRM system, such as Salesforce, is the handling of legacy data. In this article, Toptal Software Engineer Marian Paul provides 10 tips for successful legacy data migration to Salesforce.


  • Languages

    SQL, C++, C, Java, C#, T-SQL
  • Tools

    Salesforce Dataloader, Microsoft Access, Convergys/Infynis/Geneva Billing System
  • Storage

    Oracle PL/SQL, Oracle SQL, Siebel EIM, Master Data Management (MDM), Microsoft SQL Server
  • Other

    Data Migration, Siebel, Unix Shell Scripting, Data Quality Analysis
  • Platforms

    Oracle, Salesforce, Windows, Unix


  • Engineer's Degree in Software Engineering
    1997 - 2002
    Faculty of Electrical and Informatics - Slovakia, Bratislava

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