Team Lead - Data Science - OpenX

Job Title: Team Lead - Data Science
Job Location: Krakow
Job Listing URL: https://jobs.lever.co/openx/ad0368ca-e8da-4c23-a23a-8d7c46a22fd2
Job Description: Company at a Glance
OpenX is focused on unleashing the full economic potential of digital media companies. We do this by making digital advertising markets and technologies that are designed to deliver optimal value to publishers and advertisers on every ad served across all screens.

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 Team Lead 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 datasets
We want to talk to you.

1.5-Year Contract (Maternity Leave Coverage)
What we offer
Employment contract (21 250 - 23 750 PLN gross/monthly)
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 Responsiebilities
Lead a team of data scientists and engineers in delivering high-quality products and services with measurable business impact.
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 engineers 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.
Own the end-to-end development lifecycle, managing technical risks and delivering consistent results.
Partner with business teams to align technical priorities with strategic goals and ensure measurable outcomes.
Stay informed on industry trends and advancements, applying relevant insights to improve team practices and solution performance.
Required Qualifications
5+ years of experience in engineering, with a strong technical foundation.
1+ year of experience leading engineering 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, with a strong grasp of statistical analysis.
Deep understanding of probability and statistics, with experience applying methods at scale.
Bachelor’s degree in Computer Science 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)