George Sifonios Email & Phone Number

Greater London, England, United Kingdom

London, England, United Kingdom

- Led the automation of marketing reporting through SQL, transitioning from Excel files to self-service dashboards utilizing Quicksight, dramatically reducing report preparation time from two days to one hour.- Championed the implementation of an integrated marketing environment that consolidates data from multiple vendors (e.g., Google Ads, Facebook Ads) into a unified dashboard, enhancing campaign management efficiency for Marketing Managers.- Spearheaded experiments with media… Show more - Led the automation of marketing reporting through SQL, transitioning from Excel files to self-service dashboards utilizing Quicksight, dramatically reducing report preparation time from two days to one hour.- Championed the implementation of an integrated marketing environment that consolidates data from multiple vendors (e.g., Google Ads, Facebook Ads) into a unified dashboard, enhancing campaign management efficiency for Marketing Managers.- Spearheaded experiments with media vendors to measure the incremental impact of social campaigns on conversions.- Conducted deep dives to improve the performance of the Media Mix Model. Show less

London, England, United Kingdom

Main responsibilities: Create Looker dashboard using online transactional data aiming to provide customers insights, Lead experiments (A/B testing) to help Marketing team to target better customers, Deep dive to online transactional data to provide insights that shaped strategical positions for the application.- Conducted in-depth analysis of online transactional data to optimize customer online journeys using Google Analytics, providing strategic insights to the digital… Show more Main responsibilities: Create Looker dashboard using online transactional data aiming to provide customers insights, Lead experiments (A/B testing) to help Marketing team to target better customers, Deep dive to online transactional data to provide insights that shaped strategical positions for the application.- Conducted in-depth analysis of online transactional data to optimize customer online journeys using Google Analytics, providing strategic insights to the digital department.- Collaborated closely with senior leadership across Marketing, Finance, and CRM teams to develop and maintain insightful dashboards with Looker and BigQuery, enhancing web performance monitoring.- Led experiments designed to improve decision-making processes and informed strategic initiatives. Show less

London, England, United Kingdom

Main responsibilities: Create Tableau dashboards for various teams to present customer insights,Deep dive into transactional data to provide customer insights leading to strategic decisions- Analyzed transactional data to monitor key customer KPIs and evaluate commercial performance, driving strategic insights.- Developed and enhanced Tableau dashboards to facilitate ongoing understanding of customer trends, producing weekly/monthly trade reports and identifying key product… Show more Main responsibilities: Create Tableau dashboards for various teams to present customer insights,Deep dive into transactional data to provide customer insights leading to strategic decisions- Analyzed transactional data to monitor key customer KPIs and evaluate commercial performance, driving strategic insights.- Developed and enhanced Tableau dashboards to facilitate ongoing understanding of customer trends, producing weekly/monthly trade reports and identifying key product drivers.- Partnered with senior leadership to deliver detailed, ad hoc customer analytics focused on key markets, enabling data-driven strategic decisions. Show less

London, United Kingdom

Main responsibilities: Create end-to-end data pipelines in SQL, Develop forecasting models to predict customer retention, Build data products focused on the energy and postal services industries- Provided comprehensive profile analysis to support client campaigns and strategic initiatives across Banking, Energy, and Telecommunications industries.- Enhanced and automated processes using SQL and Python to reduce execution time and ensure data quality.- Liaised with stakeholders to… Show more Main responsibilities: Create end-to-end data pipelines in SQL, Develop forecasting models to predict customer retention, Build data products focused on the energy and postal services industries- Provided comprehensive profile analysis to support client campaigns and strategic initiatives across Banking, Energy, and Telecommunications industries.- Enhanced and automated processes using SQL and Python to reduce execution time and ensure data quality.- Liaised with stakeholders to understand data content and business requirements, translating them into actionable insights. Show less

Kos Island, Greece

- Administered the Brigade’s Active Directory, ensuring optimal network functionality and security.- Maintained and provided technical support for local networks and military applications, ensuring operational efficiency.

Athens, Greece

- Debugged SQL scripts, troubleshot code, and resolved performance issues to maintain system integrity.- Designed, developed, and maintained reports using QlikView, TARGIT, and Tableau, providing critical business insights.- Translated written business requirements into detailed technical specifications, ensuring accurate implementation.

Malta

- Developed a data mining project to collect and process game behavioral data, implementing the Generalized Sequential Pattern algorithm in a Java environment.- Clustered gamers based on their strategic approaches using Weka software, providing actionable insights into player behavior.

Kos

- Maintained the official municipal website, ensuring up-to-date content and optimal performance.- Coordinated with content creators to improve the website’s structure, enhancing user experience and accessibility.

Msc Business Analytics, 2:1 Upper Second

Activities and Societies: Social Media (Administrator of UEBS’ Instagram account) UEBS Business Society Main modules studied: Business.

Bachelor’S Degree, Information & Communication Systems Engineering, 2:1 Upper Second

Modules studied: Data structures, Databases, Data Warehouses and Knowledge Mining from Data, Information Systems Management, Information.