Team Lead - Data Science (Fixed Term)

Company at a GlanceOpenX 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.
1.5-Year Contract (Maternity Leave Coverage)
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 questionsOpen-minded - happy to give & receive feedback, not afraid to fail and move onPersistent - exhibit the skills and attitude to lead a project to success as well as how to extract yourself from common pitfallsCreative - researching and developing a solution to challenging problems with large datasetsWe want to talk to you.

What we offer

• 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

• Extracting data from terabyte-scale datasets and transforming it to compact representations which are amenable to use by a wide variety of models
• Developing and managing ML pipelines to predict and model key components and phenomena in our ad exchange, leveraging these to answer questions and improve performance
• Construction of novel model types and tuning existing models and their products to enhance functionality and drive new developmental features
• Guiding and developing DS / ML projects from inception to production-level deployment while reporting to stakeholders on progress and challenges
• Coordinating with other members of the team to deploy, manage, and synchronize the function of all ML models in production and development

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)

OpenX VALUESOur five company values form a solid bedrock serving to define us as a group and guide the company. Our values remind us that how we do things often matters as much as what we do.
WE ARE ONEWe are one team. There are no exceptions. We are a group of strong and diverse individuals unified by a shared mission. We embrace challenges and win together as a team. We respect and care about our colleagues and cultivate an inclusive culture
WE ARE CUSTOMER CENTRICWe innovate on behalf of our customers. We understand, respect, and listen carefully to our customers. We build great products to solve our customers’ problems. We manage our customers’ expectations clearly and honestly. We are a trusted partner to all of our customers - we act with integrity at all times. We care.
OPENX IS OURSWe are all owners of OpenXWe all have a voice to improve OpenXWe stake our personal and professional reputations on the excellence of our workWe are not interested in just "doing our jobs"; we take ownership to drive results
WE ARE AN OPEN BOOKWe understand and respect what each of us does. We are eager to teach and share what we know with others, both internally and externally. We are eager to learn from others and we ask questions internally and externally. 
WE EVOLVE FASTWe take responsible risks and own and learn from our mistakes. We recognize and repeat success. We actively seek out and provide constructive feedback. We adapt quickly and embrace change. We tackle growth and learning with real urgency. We are endlessly curious.
OpenX TRAITSOur three traits capture what makes a great team member at OpenX.
HUMBLEIdeal team players are humble and demonstrate integrity. They put the team's success above their own, share credit generously, and value collective achievements. They are self-assured, open to coaching, and committed to continuous learning.
DRIVENIdeal team players are results-driven and motivated. They are curious, always seeking more to do, learn, and take on. As proactive problem-solvers, they take initiative without needing external motivation. They continuously think about the next steps and opportunities for improvement.
SMARTIdeal team players are smart and possess the intellectual acumen to understand the complexities of our organization and industry. They are interpersonally intelligent, good communicators, and exemplify sound judgment in their interactions across the company to foster a collaborative environment.
OpenX is committed to equal employment opportunities. It is a fundamental principle at OpenX not to discriminate against employees or applicants for employment on any legally-recognized basis including, but not limited to: age, race, creed, color, religion, national origin, sexual orientation, sex, disability, predisposing genetic characteristics, genetic information, military or veteran status, marital status, gender identity/transgender status, pregnancy, childbirth or related medical condition, and other protected characteristic as established by law.
OpenX Applicant Privacy PolicyApplicants can review our Applicant Privacy Policy at any time by visiting the following link: https://www.openx.com/privacy-center/applicant-privacy-policy/.
Effective Date: November 21, 2024