I am a results-driven Data & BI Analyst with several years of experience delivering insights across financial institutions and capital markets. I harness SQL, Python, Power BI, and Excel to optimize investment strategies, streamline reporting, and support executive decision-making. I am passionate about applying data analytics and BI methodologies to unlock business value, mitigate risks, and drive actionable growth across teams.

Marietta Ziazia

I am a results-driven Data & BI Analyst with several years of experience delivering insights across financial institutions and capital markets. I harness SQL, Python, Power BI, and Excel to optimize investment strategies, streamline reporting, and support executive decision-making. I am passionate about applying data analytics and BI methodologies to unlock business value, mitigate risks, and drive actionable growth across teams.

Available to hire

I am a results-driven Data & BI Analyst with several years of experience delivering insights across financial institutions and capital markets. I harness SQL, Python, Power BI, and Excel to optimize investment strategies, streamline reporting, and support executive decision-making.

I am passionate about applying data analytics and BI methodologies to unlock business value, mitigate risks, and drive actionable growth across teams.

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Experience Level

Expert
Expert
Expert
Expert
Intermediate
Intermediate

Language

English
Fluent
French
Intermediate
Spanish; Castilian
Intermediate
German
Intermediate

Work Experience

Investment Research and Data Analyst at National Bank of Greece
May 1, 2015 - November 11, 2025
Developed interactive dashboards using Power BI to monitor portfolio performance; Conducted statistical analysis in Python to identify market trends, supporting investment decisions; Automated data cleaning workflows in SQL, improving data accuracy; Preparing and presenting analytical reports to senior management to support decision-making
Market and Data Analyst (FESE Statistical Committee Member) at Athens Exchange Group
June 1, 2025 - June 1, 2025
Prepared monthly and annual reports to international institutions; Prepared and presented analytical reports to senior management to support decision-making and presentations for institutional clients; Automated data cleaning workflows in SQL, improving data accuracy; Developed and issued daily, monthly and annual publications for public communication and awareness; Issued E-signatures to partners; Responsible for the management and evaluation of stock market indices
Market Analyst (Market Analyst and Trader) at Alpha Finance
December 1, 2022 - December 1, 2022
Produced daily, weekly, monthly, mid-year and annual equity market reports covering Greek and European stocks, integrating macroeconomic indicators and sector trends to support institutional investment decisions; Conducted valuation modeling (DCF, comparables) for listed companies; Collaborated with trading and sales teams to deliver real-time market intelligence; Executed equity and derivative trades across Greek and European markets; Monitored intraday market movements to optimize trading strategies
Processing Specialist and Back Office Reporting Analyst at First Data Hellas Processing Services S.A
January 31, 2018 - January 31, 2018
Prepared analytical reports to senior management; Verified and executed orders and requests from banks

Education

Master of Science in Finance and Banking for Executives at Athens University of Economics and Business
January 11, 2030 - November 11, 2025
Bachelor’s in Applied Mathematics (major in Economics) at University of Crete
January 11, 2030 - November 11, 2025

Qualifications

A1 Certification
January 11, 2030 - November 11, 2025
A2 Certification
January 11, 2030 - November 11, 2025
B1 Certification
January 11, 2030 - November 11, 2025

Industry Experience

Financial Services, Professional Services, Software & Internet