Christos Alexakis

• Worked close to the CEO and Retention and Acquisition squads • Developed marketing attribution models using PySpark BigQuery and Airflow • Analysed user journeys in web and mobile application to provide funnel performance transparency • Extracted insights from user text reviews using NLP methods like sentiment analysis and co-occurence graphs • Oversaw the deployment of Snowplow tracking pipeline in GCP working closely with Data Engineers • Prepared learning sessions for data science topics

• Acquired data from external providers using APIs and web scraping to use in reporting • Wrote PySpark ETL jobs and configured Dataproc clusters to load event data in BigQuery ready to be consumed • Helped in hiring and mentored a data analyst in the team • Built Dashboards in Data Studio and assisted squads with setting and monitoring KPIs • Enhanced tracking data with new events using Javascript and Google Tag Manager • Designed and set up A/B Tests in Google Optimize and Firebase Remote Config

• Analysed raw data from Snowplow and PostgreSQL using Apache Spark (Scala and PySpark), Python (pandas, NumPy, matplotlib, Seaborn, Bokeh) and SQL • Prepared business performance reports for the CEO and investors • Analysed customers using cohort analysis and customer segmentations • Maintained the BI data pipeline and dashboard application ensuring data integrity

• 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

• 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

•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

• 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

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

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

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