Gdańsk, Poland Wrocław, Poland Bulgaria Romania Remote

Lead Data Scientist



Ciklum is looking for a Lead Data Scientist to join our team full-time.

We are a leading global product engineering and digital services company that unites 4000+ seasoned professionals globally on various projects in healthcare, fintech, travel, sportswear, entertainment, and security. Ciklum delivers high-impact technology solutions to Fortune 500 and fast-growing organizations worldwide.

About the role:

As a Lead Data Scientist, you’ll become a part of a development team working for our client, who is focused on data-driven solutions in the advertising industry and develops technical solution to efficiently address target groups with first-class target group segments and intelligent solutions for retargeting and new client acquisition.


  • Lead the development of graph-based technical solutions by developing and implementing algorithms and methodologies to extract insights from complex networks and interconnected data sources.
  • Development of prototype solutions, mathematical models, algorithms, machine learning techniques, and robust analytics to support analytic insights and visualization of complex data sets
  • Contribute to product features like offers, personalization, and recommender by analyzing complex data sets and developing algorithms to produce results that increase customer engagement.
  • Drive innovation by exploring new experimentation methods and data analytics techniques that could sharpen or speed up product decision-making processes
  • Develop and deploy testing hypotheses and analyze test results, providing the necessary analytical rigor to ensure data quality, consistency, repeatability, and accuracy of insightsCross-trains other team members on technologies being developed, while also continuously learning new technologies from other team members.
  • Interacts with engineering teams and ensures that solutions meet customer requirements in terms of functionality, performance, availability, scalability, and reliability.


  • 5+ years of experience as a Data Scientist/ML Engineer/Data Engineer/Big Data Developer with a proven track record of leveraging analytics to drive significant business impact2+ years contributing to production deployments of large backend data processing and analysis systems
  • Expertise in Graph-based Learning Techniques
  • Experience with Graphene (graphene-python) – GraphQL framework for Python
  • Experience in Machine Learning (e.g. regression and classification algorithms such as random forest, boosting)
  • Deep Learning techniques
  • Hands-on experience coding in Python with solid CS fundamentals including data structure and algorithm design
  • High proficiency with Python libraries (Pandas, NumPy, scikit-learn, PyTorch).
  • Experience in processing and analyzing big data setsHands-on implementation experience working with Spark (PySpark, Spark ML)
  • Previous background with cloud data platform AWS (AWS Sage Maker, AWS Glue)
  • Knowledge of software engineering best practices across the development lifecycle, including agile methodologies, coding standards, code reviews, source management, build processes, testing, and operations
  • BSc or equivalent in Mathematics, Statistics, Computer Science, Economics, or another related field


  • Experience in Web AdsExperience in TelecommunicationsUse of ML in Digital Marketing

Personal skills

  • Fluent English – spoken and written
  • German knowledge (is a plus)
  • Collaborative, willing to help, talkative, able to clearly express and discuss ideas
  • Curious mind and willingness to work with client in consultative manner to find areas to improve
  • Good analytical skills
  • Good team player, motivated to develop and solve complex tasks
  • Self-motivated, self-disciplined and result-oriented
  • Strong attention to details and accuracy.

What's in it for you

  • Care: your mental and physical health is our priority. We ensure comprehensive company-paid medical insurance, life insurance and Multisport card
  • Tailored education path: boost your skills and knowledge with our regular internal events (meetups, conferences, workshops), Udemy licence, language courses and company-paid certifications
  • Growth environment: share your experience and level up your expertise with a community of skilled professionals, locally and globally
  • Opportunities: we value our specialists and always find the best options for them. Our Internal Mobility Program helps change a project if needed to help you grow, excel professionally and fulfil your potential
  • Global impact: work on large-scale projects that redefine industries with international and fast-growing clients
  • Welcoming environment: feel empowered with a friendly team, open-door policy, informal atmosphere within the company and regular team-building events

Be bold, not bored!

Experiences of tomorrow. Engineered together

Interested already?

We would love to get to know you! Submit your application. Can’t wait to see you at Ciklum.


Looking for something else?

Find a vacancy that works for you. Send us your CV to receive a personalized offer.

Send CV