Senior Data Scientist (user behaviour)
Athens, Greece
πριν από 1 ώρα
source : Just Join IT

user behavior models (regular)

segmentation (regular)

churn prediction (regular)


Brainly is looking for a Data Scientist to join the App Experience & Monetization team to boost the performance of conversion optimization tactics , as well as driving an instantaneous app experience.

Product Teams at Brainly are working on some of the most complex technical challenges in the ed-tech space and creating the product for over 300 million students from all around the world.

We focus on building the infrastructure and features that enable Brainly users to learn and collaborate, ask, and answer millions of questions every day.

On a daily basis, you will work with a fully independent product team that includes : developers, Bi analysts, product designers, QA.

You will take full responsibility for your product area from conception to completion creating valuable and engaging products .

All of the features that we are releasing are under the A / B / n test, so you will see how your work impacts students and the company in practice.

You will have the chance to work with top-class scientists, engineers, and domain experts, and to drive the data science process of our products end-to-end.

We alternate the development workflow with research spikes on state-of-the-art machine intelligence applied to understanding and personalizing learning experiences.

The ideal candidate is an enthusiast of educational technologies and a business aware data scientist; strong in coding while having proper theoretical background in machine learning and statistics.

Are you a goal-driven team player? Do you like tackling new challenges using leading-edge industry tools? Can you adapt to rapidly changing conditions while learning and bettering yourself?

Are you a detail-oriented expert who loves focusing on quality? If you answered yes to these questions, you might just be the perfect candidate for this role!


  • Consult stakeholders to define most promising and time-to-value effective research areas.
  • Research and implement novel techniques for audience segmentation,
  • Develop user behavior modeling tools , especially for : purchase prediction, churn prediction and next best offer prediction ,
  • Explore and analyze multi-dimensional and unstructured data in order to find patterns and relationships.
  • Work closely with engineers in order to integrate models and algorithms with the larger system.
  • Effectively communicate results and storytelling with the data.
  • Ensure statistical and scientific rigor among the whole team.
  • Work closely with the product teams and business stakeholders to design new features or improve the functionalities and user experience of the platform.
  • Educate Brainly employees on topics related to Machine Learning.

  • 4+ years experience, or a comparable industry career, with machine learning, data mining, or statistical modeling.
  • Experience with analyzing massive datasets on a distributed cluster of machines (map / reduce or other parallel computing frameworks).
  • Strong theoretical background on at least a few among high-dimensional classifiers, regression models, clustering algorithms, recommender systems, time-series analysis, Bayesian inference, text analytics, knowledge graphs, representation learning (embeddings), computer vision, or social network analysis.
  • At least some of the data analysis and visualization tools such as pandas, dask, vaex, matplotlib, seaborn, plotly, dash, bokeh, shap, streamlit.
  • At least some of the data engineering technologies such as Spark, DataBricks, Glue, EMR, Docker, Kubernetes, SQL, key-value stores, Redshift, Snowflake.
  • At least some of the ML technologies such as AWS SageMaker, Tensorflow Extended, PyTorch, Spark ML, scikit-learn, XGBoost, KubeFlow, MLFlow, or related frameworks.
  • Working knowledge of Python and the PyData stack or other numerical programming languages.
  • Fluent in English, both verbal and written.
  • Ability to prototype and test suboptimal solutions quickly and iterate up to a final product that can be deployed in production.

  • Experience with segmentation, churn prediction or other machine learning models in production.
  • Experience with large volume ETL jobs or data streaming.
  • Experience with graphs data and algorithms.
  • Experience as a contributor or owner of GitHub repositories.
  • Master’s degree or above in STEM fields (science, technology, engineering, or mathematics) or a similarly quantitative field.
  • PhD with publications in Statistics, Data Science, Computer Science, Machine Learning, Mathematics or similar.

  • We want to see you grow along with us you will have 800$ per year for personal development, extra time for attending conferences and workshops, and unlimited access to an online learning platform (courses from Coursera, Udacity, Udemy, Harvard ManageMentor, and many others!)
  • Health is important, which is why at Brainly, we fully cover private health & dental care packages for you and your family and provide you with a sport card (Multisport Plus in Poland, Andjoy in Spain)
  • You will also get an access to online individual psychological consultations with professionals in English & Polish via the Mental Health Helpline
  • Flexible working hours working requires communication, so we work within the European business hours, but we also know that life may be unpredictable, so if you need to jump out of work (doctor’s appointment, emergency, anything) no problem!
  • Your personal concierge AskHenry will support you in your daily duties, eg. planning your dream vacation
  • We will provide you with all the necessary equipment & tools , including an additional budget for accessories which will make your remote setup even more comfortable.
  • You can join internal communities and contribute to charity, diversity and inclusion initiatives, take part in great internal events or represent Brainly at conferences or meet-ups.

    Brainly is the online learning platform where over 300 million students and parents go from questioning to understanding.

    With their smartphones, users can snap a photo to instantly solve any problem or homework question and be matched with a Brainly product such as Community Q&A, Brainly Tutor, Math Solver or Textbook Detective.

    Brainly is built to provide students, parents, experts, and teachers with a collaborative platform and tools needed to succeed in any educational environment.

    Based in Kraków, Poland, with U.S. headquarters in New York City, Brainly apps and websites are visited by users from over 35 countries.

    Backed by Prosus, Point Nine Capital, General Catalyst, Runa Capital, Learn Capital and Kulczyk Investments. Learn more about Brainly at .

    By sending us your application you agree that Brainly sp. z o.o. will process your personal data to participate in this recruitment process.

    If you want to know more about how Brainly processes your personal data please click here .

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