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Senior Data Engineer · Warsaw, Poland

Porfyrios Giannakouris

Software Engineer (Data & AI) with 7+ years of experience building data pipelines, ML systems, and web apps. Currently working as a Senior Data Engineer at Asana.

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About

I design and build data systems end-to-end. From ingestion and transformation pipelines to ML model deployment to web apps that put insights in front of users. My background spans Python, SQL, cloud data platforms (Databricks, BigQuery, Azure), and the Django/FastAPI ecosystem.

Experience

Senior Data Engineer · Asana

Warsaw, Poland
Sep 2025 – present
  • Optimizing core data pipelines used by Data Science and Analytics.
  • Migrating data infrastructure from Snowflake to Databricks.
  • Automating recurring data workflows for cross-functional teams.

Senior Data Engineer · emendSys

Athens, Greece
Apr 2024 – Aug 2025
  • Client-serving contractor for Ernst & Young (EY) Netherlands.
  • Maintained an ETL pipeline on Azure Data Factory, Azure Functions, and Databricks (PySpark).
  • Built the backend of a desktop application using Python, SQL, and DuckDB.
  • Designed parallel pipelines for handling large datasets efficiently.

Data Scientist / Data Engineer · XPLAIN Ltd

Athens, Greece
Jan 2018 – Apr 2024
  • Researched and shipped state-of-the-art NLP techniques and ML models.
  • Built and maintained scrapers across blogs, forums, social media, and review sites.
  • Designed automated ETL pipelines in Python and SQL.
  • Developed Django, FastAPI, and Docker web apps for analytics and visualization.
  • Deployed ML models behind Flask/FastAPI APIs containerized with Docker.
  • Designed a GCP-based ETL on BigQuery, automating Looker-ready data delivery.

Education

BSc, Digital Systems

University of Piraeus
Piraeus, Greece

Coursework: Mathematical Analysis, Linear Algebra, Software Engineering, OOP, Data Structures, Database Systems, AI, UNIX, Data Warehousing & Mining. Thesis: Textual Emotion Classification with Python & Scikit-Learn.

MSc, Quantum Computing and Quantum Technologies

Democritus University of Thrace
Remote · Oct 2023 – present

Coursework: Quantum computing, qubit devices, solid-state quantum devices, quantum communications, quantum algorithms, quantum machine learning. Thesis: Quantum Computing and Quantum Machine Learning in the Life Sciences.

Projects

baionic.net

Personal portfolio site (this one) — Django + Bootstrap 5, dockerized, hosted on Digital Ocean App Platform.

Django Bootstrap 5 Docker Digital Ocean
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pgnlp

Python package of NLP utilities for cleaning text — strips or replaces numbers, hashtags, URLs, punctuation, dates, emojis and more.

Python NLP
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crudlib

Lightweight CRUD library on top of SQLAlchemy ORM. Drop-in for projects that need quick database management.

Python SQLAlchemy
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Skills

Programming

Python SQL JavaScript HTML/CSS C

Databases

PostgreSQL MySQL BigQuery MongoDB DuckDB

Data & ML

Pandas NumPy Scikit-Learn TensorFlow Hugging Face Transformers LangChain spaCy NLTK FastText

Web

Django FastAPI Flask Bootstrap

Data Platforms

Databricks PySpark Airflow Azure Data Factory Azure Functions

Tooling

Docker Linux Git Selenium

Languages

Greek · Native
English · Highly proficient
Chinese · HSK2

Get in touch

Have a project in mind, a role you'd like to discuss, or just want to say hi? Send me a message.