k
koutsourelis

Giannis K

@koutsourelis

Data Analyst for Dashboards RFM and Excel Automation

Greece
English, Greek
About me
I help retail, hospitality and e-commerce businesses turn Excel and CSV data into clear dashboards, customer segments and practical business decisions. I specialize in sales reporting, KPI dashboards, RFM customer analysis and automated Excel/Power Query reporting. My work combines business analysis with hands-on experience in Tableau, Power BI, Excel, Python and SQL. You receive clear deliverables, practical insights and reporting you can actually use.... Read more

Skills

k
koutsourelis
Giannis K
Offline • 

See my services

BI Analytics
I will build a power bi or tableau sales dashboard with actionable insights
From$20 / projectMore details
BI Analytics
I will perform rfm customer segmentation and identify high value customers
From$20 / projectMore details

Portfolio

Work experience

The_Mart

Business Intelligence & CRM Analyst

The Mart • Full-time

Mar 2026 - Present • 5 mos

-Analyze sales, customer, CRM and commercial data to support marketing and business decision-making. -Led customer data standardization initiatives, improving segmentation accuracy by developing a taxonomy categorization framework. -Proposed and contributed to the design of a multi-level customer classification system, including the introduction of additional data attributes to enhance analytical depth. -Built Tableau dashboards and reports to support customer analysis, campaign execution, and data extraction workflows. -Conducted data scraping projects (Phantombuster, Apify, Python) to identify and enrich new customer datasets, particularly for regional expansion (e.g., island markets). -Developed Python-based automation scripts and internal tools for customer data cleaning, preprocessing, matching, deduplication, and outreach workflow optimization. -Collaborated cross-functionally with IT, Marketing, Ecommerce, and Commercial teams to implement CRM process improvements, data structure enhancements, and reporting solutions. -Utilized Tableau, SAP ERP/BW, Excel Power Query, Python, SQL-oriented logic and advanced data transformation techniques to improve reporting efficiency, automation, and business decision-making. -Supported commercial controlling operations through pricing analysis, competitor benchmarking, supplier price list analysis, and SAP BW / Excel-based reporting. -Created internal documentation, glossary and process playbooks to improve onboarding and operational consistency.