Senior Data Scientist IV - Fixed Term

OpenX - Senior Data Scientist IV - Fixed Term

What we offer

Employment contract (24 437 - 27 300 PLN gross/monthly) OR B2B (190 - 213 PLN net/hourly)

• Working with the newest technologies such as Cloud Computing (GCP)
• Challenges at work that are difficult to find anywhere else!
• Solving important problems in a scale
• Joining a company that is growing and scaling
• Flexible working hours & remote work option

Key Responsibilities

• 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.

Required Qualifications

• 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
• 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.

Desired Characteristics

• Experience mentoring and guiding junior team members.
• Strong decision-making skills with a pragmatic mindset and ability to avoid over-engineering.
• Hands-on experience with cloud platforms, especially Google Cloud Platform (GCP)
• Background in digital media, marketing technology, or advertising technology industries.

Our benefits (on employment contract):

• Annual performance bonus
• Tax-deductible system due to copyright protection: 75%
• Private health care for you and your family (covered by OpenX)
• Private life and travel insurance (Covid insurance included)
• MultiKafeteria program
• Training: access to the LinkedIn learning platform and Tech workshops
• Holiday Allowance
• Pension scheme (PPK from PZU)
• Additional paid day off
• Free parking lot
• Access to peer to peer recognition platform
• Monthly work-from-home allowance and one-time payment when you join us to help you set up your home office
• We celebrate team members' important personal milestones (vouchers, gifts)