About Milen
I help companies transform complex data into clear, actionable insights by designing robust data platforms and delivering business-ready dashboards that decision-makers actually trust and use.
With my experience in BI, Data Warehousing, and Analytics, I work with clients in retail, logistics, telecom, and finance to build end-to-end data solutions — from data ingestion and modeling to advanced analytics and visualization.
How I help my clients
- Design and implement scalable data architectures (DWH, Azure, Oracle, SQL)
- Build and optimize data pipelines (Azure Data Factory, Synapse, ODI, Python)
- Transform raw, fragmented data into clean, analytics-ready models
- Develop interactive Power BI dashboards that track KPIs, performance, and trends
- Support migration projects (Business Objects → Power BI / Tableau)
- Ensure automation, monitoring, and reliability of data flows
What makes me stand out
- Strong business understanding: I translate business questions into the right data models and KPIs
- End-to-end ownership: from requirements gathering to production support
- Hands-on technical expertise combined with BI leadership experience
- Proven background in high-volume, mission-critical environments (telco, finance)
- Experience working in agile, international teams and directly with stakeholders
Typical projects & deliverables
- Power BI executive dashboards (Sales, Performance, Finance, Operations)
- Azure-based data platforms (ADF, Azure SQL, Synapse)
- Enterprise DWH design and redevelopment
- Data integration from ERP, CRM, OSS, Excel, APIs, ElasticSearch, InfluxDB
- KPI definition, DAX calculations, and performance optimization
- Documentation, knowledge transfer, and long-term support
Tech stack
Power BI • Azure Data Factory • Azure SQL • Synapse • Oracle • PostgreSQL • SQL Server • Python • Tableau • SAP Business Objects • Denodo • Grafana • Databricks
English
Fluent
Bulgarian
Native or bilingual
Remote only
Primarily works remotely
Experience
- ORNOReports for a client in Retail and Logistics industryLOGISTICS AND SUPPLY CHAINJanuary 2024 - February 2025 (1 year and 1 month)Project Description: Prepare data models, data maps and transformations. Design data pipelines to ingest data from various sources using ADF (Azure Data Factory) and Azure SQL. Automate, orchestrate, schedule, support and monitor of new and existing pipelines. Develop a comprehensive Sales Performance Dashboard using Power BI to visualize key metrics and trends. Utilize Azure SQL DB, and Cloud services to provide a unified view of the sales data. Implement DAX (Data Analysis Expressions) to create calculated KPIs for advanced analytics.Project Role: Team Leader, Power BI Developer and Data AnalystProject Tasks: Gather and analyze business requirements, develop pipelines:Collect, analyze, and integrate data from various sources (ERP, Excel spreadsheets, Elastic Search)Cleanse and transform data using Power Query and Azure Synapse Analytics to optimize data storage and analysis performanceMap source data to target modelDevelop Power BI interactive dashboards with dynamic visualizations
- Hutchison Drei Austria (H3A)Network Performance Monitoring (NPM)TELECOMMUNICATIONSJuly 2022 - November 2023 (1 year and 4 months)Project description.Analyze, design, develop, test, deploy, and supportH3A Network Performance Monitoring and Management system in an agile teamProject TasksGather and analyse client’s requirements, Data modeling and design, Design data flows. Ingest various OSS data (RAN and Core Network) from Oracle DB, data files, and InfluxDB according to priorities from Product Owner and Stakeholders using Python, C++, Bash. Automate and schedule the data ingestions and data flows. Support and monitor the existing data pipelines. Data presentation layer in Grafana (InfluxDB) and Denodo (Oracle).
- BulsatcomBilling/CRM Migration DWH RedevelopmentTELECOMMUNICATIONSSeptember 2021 - April 2022 (7 months)Sofia, BulgariaProject description.Analysis of the source systems, design and development of DWH data model, implementation of ETL solution based on Oracle ODIProject TasksAnalyze data, implementation of processes and flows for loading data daily, develop the needed reporting and dashboard structuresFurther ElaborationIt was a Billing/CRM migration, development, and support.My duties were:- analyze the raw data- meetings with those responsible for the raw data, and meetings with business people to develop and implement their wishes.- data prep-еxpanding the data model according to the new requirements of the business (Incl. Oracle, ODI, SAP Business Objects)- monitoring and troubleshooting- project support and daily monitoring of data loadingding
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Education
- Databricks Certified Data Engineer Associate Databricks Certified Data Engineer Professional Microsoft Certified: Power BI Data Analyst AssociateDatabricks Certified Data Engineer Associate Databricks Certified Data Engineer Professional Microsoft Certified: Power BI Data Analyst Associate
- Software DevelopmentComputer Academy IT STEP2020Software Development
Certifications
- Databricks Certified DAta Engineer ProfessionalDatabricks2025
- Databricks Certified Data Engineer AssociateDatabricks2024