Christos Alexakis

Freiberuflich, Data Analytics Freelancer, Freelancer
Abschluss: M. Sc. (1.4, "excellent"), TU Berlin
Berlin, Deutschland

Fähigkeiten und Kenntnisse

Python
SQL
BigQuery
Data Analysis
Data Mining
Pyspark
GCP
Machine Learning
AI
Looker Studio
Looker
Superset
Tableau
Power BI
BI
Marketing Intelligence
Google Analytics
Google Tag Manager
Data Science

Werdegang

Berufserfahrung von Christos Alexakis

  • Bis heute 5 Jahre und 1 Monat, seit Jan. 2021

    Data Analytics Freelancer

    Freelancer

    Enabling data-driven growth for e-commerce clients contributing to over 20% YoY revenue impact. Clients include large companies with annual marketing spends > €30M as well as smaller ones with low data fluency. •Marketing Intelligence •KPI Definition •Attribution Models •Advanced Analytics •Data Modelling •Marketing Operations Automation Tech Stack: Python, BigQuery, SQL, ML, Looker, Superset, Tableau, Power BI, Google Analytics, GTM, GCP, Airflow, Docker, Dataform, dbt

  • 1 Jahr und 7 Monate, Juli 2019 - Jan. 2021

    Senior Data Scientist

    fromAtoB GmbH

    • Developed marketing attribution models using PySpark, BigQuery and Airflow • Worked closely with Marketing and Growth teams delivering insights to optimize campaigns and reach OKRs • Served as data consultant for Acquisition and Retention squads as well as in projects of the data science team • Analyzed user journeys in web and mobile application to provide funnel performance transparency • Extracted insights from user text reviews using NLP methods in Python uncovering improvement potential

  • 1 Jahr und 1 Monat, Juli 2018 - Juli 2019

    Data Scientist

    fromAtoB GmbH

    • Delivered advanced analytics including cohort analyses, customer clustering, CLV and TV marketing performance • Migrated reporting to Looker Studio and consulted marketing and product teams with setting and monitoring KPIs • Wrote PySpark ETL jobs and configured Dataproc clusters to load Snowplow event data in BigQuery • Designed and analyzed A/B Tests in Google Optimize and Firebase Remote Config • Built marketing data connectors to BigQuery and web scraping scripts in Python to use in reporting

  • 1 Jahr und 4 Monate, März 2017 - Juni 2018

    Data Analyst

    fromAtoB GmbH

    • Analyzed Snowplow events (~1m/ day) and transactional data with Apache Spark, Python (pandas, NumPy, matplotlib, Seaborn, Bokeh) and PostgreSQL • Prepared business performance reports for the CEO and investors • Enhanced tracking data with new events using Javascript and GTM • Maintained the BI data pipeline and dashboard application in AWS ensuring data integrity

  • 1 Jahr und 11 Monate, Feb. 2016 - Dez. 2017

    Consultant

    Done! Berlin

    • Automated reporting process with Python and Google Sheets • Tracked project performance and provided with recruiting KPIs • Conducted active search for all seniority level positions for high value Startup companies

  • 10 Monate, Mai 2015 - Feb. 2016

    Data Analyst

    Hellenic Army, Research and Informatics Corps

    • Developed MS Access database applications • Administered the local computer network and maintained hardware (100 workstations) • Created PowerPoint presentations for high level military meetings and events • Operated Strictly Confidential Documents

  • 1 Jahr und 8 Monate, Sep. 2013 - Apr. 2015

    Researcher - Fraunhofer HHI, Photonic Networks & Systems

    Fraunhofer Institute for Telecommunications, Heinrich-Hertz-Institute

    •Developed a mathematical model of an optical wireless communication system in MATLAB to predict its performance given specific parameters •Increased system throughput 5 times and range 2 times •Set up a 6 month test and implemented the acquisition and logging of the communication system and weather measurement data •Analysed statistically and visualised data for publications, conferences and internal meetings •Co-authored 5 publications and contributed to the development of the HHI LED-Backhaul

  • 1 Jahr und 5 Monate, Mai 2012 - Sep. 2013

    Research Assistant

    Fraunhofer Institute for Telecommunications, Heinrich-Hertz-Institute

    • Performed characterisation tests and measurements for high frequency photodiodes and lasers (up to 40 Gb/s) • Managed, statistically analysed and evaluated the measurement data for project reports

  • 8 Monate, Okt. 2011 - Mai 2012

    HR Assistant

    Springstar GmbH

    Side job during preparation for Master studies. • Talent sourcing for Startup companies with active search and candidate contacting

  • 7 Monate, Apr. 2011 - Okt. 2011

    Data Research & HR Assistant

    Wimdu GmbH

Ausbildung von Christos Alexakis

  • 2 Jahre und 11 Monate, Apr. 2012 - Feb. 2015

    Electrical Engineering

    TU Berlin

    Optische Nachrichtentechnik, Photonik, Lichttechnik, Signal Verarbeitung Master Thesis: Design and Analysis of High Bandwidth Optical Wireless Systems with LED, Grade: 1.3

  • 6 Jahre und 3 Monate, Sep. 2004 - Nov. 2010

    Electrical and Computer Engineering

    Democritus University of Thrace

    5 year studies with advanced mathematics core. Relevant Courses: Probability Theory and Statistics, Linear Algebra, Numerical Analysis, Differential Calculus, Physics, Scientific Programming, C, HTML Thesis: "Amplification of DPSK Optical Pulses in Semiconductor Optical Amplifier", Grade: 10/10

Sprachen

  • Deutsch

    Fließend

  • Englisch

    Fließend

  • Griechisch

    Muttersprache

  • Italienisch

    Grundlagen

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