Work Experience
SENIOR DATA ENGINEER - Merck Group (Data delivery and maintainability through medallion architecture)
Duration: March 2022 – Current
Summary:
- Large-scale modernization of enterprise data ecosystem by migrating legacy Qlik Sense ETL pipelines to a new high-availability Data Hub built on Snowflake and dbt
- The project aimed to consolidate fragmented data processing into a unified, scalable, cloud-based architecture integrating with Palantir Foundry and Qlik SaaS, reducing technical debt and retiring on-premises dependencies
Responsibilities:
- Designed entire DWH architecture from scratch with ELT/ETL using SQL across multiple data layers.
- Led migration of numerous sources and tables from Salesforce and Qlik Sense code to dbt and Snowflake.
- Developed complex integration layer logic with extensive business definitions.
- Managed code and deployment using Azure DevOps.
Technologies: SQL, Snowflake, dbt, Azure DevOps, Salesforce, Qlik Sense, Palantir Foundry
BI, DWH CONSULTANT - eSports Technologies, US (Tactical Data Warehouse Architecture)
Duration: September 2020 – March 2022
Summary:
- Established a comprehensive cloud-ready data warehouse infrastructure for a fast-growing startup, integrating operational, financial, and analytics business dimensions
- The solution ensured real-time access, full governance, and automated reporting to support informed decision-making and advanced analytics readiness
Responsibilities:
- Designed data architecture, modeling, and reconciliation of diverse data sources aiming for full automation.
- Developed Power BI operational reports and dashboards for ETL process tracking and business metrics.
- Implemented ELT automation and performance tuning on Amazon RedShift clusters.
- Supported main data consumers using Tableau and Power BI.
Technologies: Amazon RedShift, S3, Lambda, Power BI, Tableau, Dataddo, Power Query, DAX
Senior DWH Developer & Tech Team Lead - The Stars Group, UK (Enterprise BI Solutions and Team Leadership)
Duration: June 2017 – September 2020
Summary:
- Led the development and enhancement of enterprise BI solutions for the world’s largest online cardroom company, supporting over 70 million clients globally
- Ensured SOX compliance and improved data mart accuracy while managing a remote development team in Bulgaria
Responsibilities:
- Designed end-to-end BI architecture including ETL, data modeling, and reporting.
- Led and trained a remote technical team to achieve self-sufficiency and productivity.
- Developed using full Microsoft BI stack: SSIS, SSAS, SSRS, and Azure technologies.
- Managed over 15 TB data warehouse on SQL Server and integrated Azure Data Factory and Data Lake for raw data extraction.
- Ensured compliance with auditors and maintained documentation and coding standards.
Technologies: SQL Server 2016/2019, SSIS, SSAS, SSRS, Azure Data Factory, Azure SQL Database, Azure Analysis Services, Power BI, GIT, SVN, Jira
Snr Developer – Database and BI - Ladbrokes Coral (Company Merger and Data Transformation)
Duration: November 2016 – May 2017
Summary:
- Led the data transformation and integration project following the merger of Ladbrokes and Coral, combining historical and current data sources to create unified analytical and reporting functions
- The project resulted in the largest market share and retail presence in the UK betting industry
Responsibilities:
- Transformed and integrated data from multiple source systems including SQL Server and Oracle.
- Developed Microsoft BI platform solutions for combined analytics and reporting.
- Collaborated with stakeholders to agree on source systems and data governance.
Technologies: Microsoft BI platform, SQL Server, Oracle
Snr Developer – Database and BI - Gala Coral Group, Gibraltar (UK) (Data Warehouse and BI Development)
Duration: January 2014 – November 2016
Summary:
- Implemented presentation layer and contributed to building the data warehouse supporting multiple business teams including C-level executives
- Supported the company’s rapid growth as a leading gaming operator in Europe with doubling revenues
Responsibilities:
- Developed and maintained SQL Server and Oracle databases and data structures.
- Created business logic, performance tuning, and automation scripts for reporting needs.
- Developed MDX queries for analytical cubes supporting financial and CRM analysts.
- Managed security access and data migration between Oracle and SQL Server.
- Produced periodic reports and dashboards for Marketing, CRM, and Finance teams.
- Utilized SharePoint 2013 BI features for reporting and documentation.
Technologies: SQL Server 2014, Oracle, T-SQL, PL-SQL, MDX, PowerShell, SharePoint 2013, SSRS, SSAS
Snr Developer – Database and BI (Finance Team) - Coral Interactive, Gibraltar (UK) (Finance Reporting and Data Reconciliation)
Duration: November 2012 – December 2013
Summary:
- Supported the finance team by developing reports, reconciling data, and defining KPIs and business data dictionaries
- Delivered over 50 reports including daily management packs and executive dashboards for a 24/7 gambling and casino interactive services business
Responsibilities:
- Developed SSRS, SharePoint, and SSAS cube reports for finance and executive teams.
- Performed data reconciliation between source systems, data warehouse, and reporting layers.
- Developed Oracle 11g database objects in RAC environment and managed deployments.
- Provided Excel reporting and training for BI users.
Technologies: Oracle 11g, SQL Server, SSRS, SSAS, SharePoint, T-SQL, MDX, PowerPivot, Excel
IT Business Intelligence Consultant - Flexware Innovation, US (Manufacturing BI Project)
Duration: September 2011 – March 2012
Summary:
- Delivered a major BI project for a global manufacturing client that doubled company turnover by completing the project on time and under budget
- Focused on performance tuning and building ETL packages and reports
Responsibilities:
- Performed performance tuning including indexing and partitioning.
- Developed SSIS ETL packages and SSRS reports based on requirements.
- Utilized SharePoint 2010 for BI solutions.
Technologies: SQL Server, SSIS, SSRS, SharePoint 2010, T-SQL
Database Developer / Junior Analyst Programmer - ERA Environmental solutions, Canada (Environmental Consulting SaaS Solution Development)
Duration: July 2011 – March 2012
Summary:
- Developed complex reports and database modules for a SaaS environmental consulting solution used by major automotive companies
- Assisted in infrastructure and security model design
Responsibilities:
- Developed complex stored procedures, functions, and chemical calculations in T-SQL.
- Performed query analysis and optimization in a multi-tier architecture.
- Assisted with production server updates and Active Directory security model design.
- Contributed to ASP.NET and Visual Basic.NET tasks and debugging.
- Managed development using Team Foundation Server 2010.
Technologies: SQL Server, T-SQL, ASP.NET, Visual Basic.NET, Team Foundation Server 2010, Active Directory
Trainee – Database and BI technologies - Flexware Innovation, US (Database and BI Development and Maintenance)
Duration: May 2010 – May 2011
Summary: Gained hands-on experience in database development, performance tuning, and maintenance tasks including SQL Agent jobs and stored procedures for BI technologies.
Responsibilities:
- Developed stored procedures, functions, triggers, and queries.
- Performed performance tuning and maintenance tasks.
- Participated in user acceptance testing and SAP working skills.
Technologies: SQL Server, T-SQL, SQL Agent, SAP
Education
- MSc Microsoft Information Technologies
Scholarship Programme at Technical University of Varna
September 2009 – July 2012
- Cisco programme
4 modules providing deep knowledge in computer networks world at Technical University of Varna
September 2009 – February 2010
- Bachelor's Degree in Computer Science and Technology
Technical University of Varna, Bulgaria
2005 – April 2009
- Erasmus Scholarship Programme
Development of a bachelor’s thesis at Otto-von-Guericke University, Germany
April 2009 – September 2009
Certification
- SnowPro Core Certified Professional
Certification ID S0018898
- SQL Server 2008 – Database development and management
- SQL Server 2008 – Database administration and maintenance
- Udemy courses
30+ lifetime learner
Upstaffer since July, 2026
