Senior Data Scientist

7 days ago

Remote Kraków, Czech Republic OpenX Full time
  • 5+ years of experience in data science, with a strong technical foundation.
  • 1+ year of experience leading data science teams or technical projects.
  • Demonstrated ability to prioritize effectively, delegate tasks, and manage competing demands.
  • Excellent communication, leadership, presentation, and collaboration skills.
  • Proficient in Python and SQL
  • Hands on experience on experiment design (A/B and Switchback) and causal inference techniques - MUST
  • Deep understanding of probability and statistics, with experience applying methods at scale.
  • Bachelor's degree in Statistics, Mathematics or equivalent practical experience
  • Working proficiency in both Polish and English.

At OpenX, we have built a team that is uniquely experienced in designing and operating high-scale ad marketplaces, and we are constantly on the lookout for thoughtful, creative executors who are as fascinated as we are about finding new ways to apply a blend of market design, technical innovation, operational excellence, and empathetic partner service to the frontiers of digital advertising.

We are seeking a driven and pragmatic Senior Data Scientist to join our Data Science Research team on a 1.5-year temporary contract as a parental leave replacement. This hybrid role combines team leadership with hands-on technical contributions. You will lead a group of skilled engineers and data scientists, collaborate with cross-functional stakeholders, and ensure the successful delivery of impactful, high-quality solutions.

If you're:

Proactive - always seeking a satisfying solution to unexplored questions

Open-minded - happy to give & receive feedback, not afraid to fail and move on

Persistent - exhibit the skills and attitude to lead a project to success as well as how to extract yourself from common pitfalls

Creative - researching and developing a solution to challenging problems with large datasetsWe want to talk to you.

1.5-Year Contract (Maternity Leave Coverage)

,[Lead a team of data scientists and engineers in delivering high-quality insights, products and services with measurable business impact., Own the methodology that powers OpenX's experimentation framework, and the analysis of experimental results, Act as a proactive driver keeping projects moving forward, focusing on solutions over obstacles, and maintaining momentum even in uncertain situations., Prioritize team workload effectively, make thoughtful trade-offs, and balance excellence with practicality recognizing when "good enough" is sufficient., Mentor, coach, and guide data scientists by helping them set career goals and chart actionable development plans., Onboard new team members and cultivate a collaborative, inclusive, and high-performing team culture., Work closely with stakeholders across the business to align on priorities, share progress transparently, and ensure ongoing communication., Partner with business teams to align technical priorities with strategic goals and ensure measurable outcomes.] Requirements: Python, SQL, Data Science, mentoring, Leadership, causal inference , experiment design, Google Cloud Platform, AWS Tools: Jira, Confluence, Wiki, GitHub, GIT, Agile, Scrum. Additionally: Private health insurance, Lunch card, Small teams, Integration events, Flat structure, Life insurance, Multikafeteria, Free coffee, Canteen, Bike parking, Playroom, Free snacks, Free beverages, Free lunch, Free parking, Modern office, No dress code, Shower.

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