Data Scientist III

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OpenX

WebsiteLinkedInAll Job Openings

201 - 500 employees

Founded 2008

💰 Secondary Market on 2015-05

Advertising

OpenX is an independent supply-side platform specializing in ad tech, enabling publishers and advertisers to achieve better ad buying and selling experiences with a focus on addressability, transparency, and sustainability. Established in 2008, OpenX provides omnichannel targeting capabilities across all channels, including CTV, and integrates seamlessly with various data sets and identity types. As the first Net-Zero verified adtech company, OpenX emphasizes responsible media practices, helping clients reduce their environmental impact while supporting social initiatives. They offer a platform that democratizes identity access for marketers, allowing for seamless audience targeting similar to walled gardens. OpenX has established itself as a leader in programmatic advertising, working with high-profile clients to integrate their technology efficiently and effortlessly.

📋 Description

• Own the end-to-end data science lifecycle for moderately complex models and significant project components — spanning data ingestion, feature engineering, modeling, validation, deployment, monitoring, and retraining. • Apply expertise across several core areas of machine learning and statistics (e.g., gradient-boosted models, deep neural networks, time series, causal inference concepts, experimentation design), selecting appropriate methods for complex data science problems. • Write efficient, modular, well-tested code for data processing, feature engineering, and model training/inference, leveraging distributed tooling (e.g., Vertex AI pipelines, Dataflow, BigQuery) where appropriate. • Design and implement robust validation frameworks for complex experiments and models, accounting for potential biases and real-world performance. • Troubleshoot complex model performance issues, data anomalies, and code bugs effectively with little guidance. • Define analytical approaches and scope data science projects for moderately complex or ambiguous business problems. • Partner with product managers and stakeholders to define success metrics and experiment goals, and to translate marketplace problems into data science solutions. • Lead the design and analysis of experiments (e.g., A/B tests, switchback) for your projects, and interpret complex model results and experimental outcomes with a focus on actionable insights and business outcomes. • Proactively identify opportunities within your domain where data science can provide significant value, and initiate exploration. • Follow and help improve established team processes for coding standards, documentation, reproducibility, and experimentation. • Mentor DS I and DS II scientists, providing technical guidance, reviewing code, analyses, and models, and supporting their growth in analytical and modeling skills. • Influence technical decisions within the team regarding modeling choices, validation strategies, and tooling through well-reasoned arguments and expertise. • Drive improvements to team standards, data science best practices, and analytical rigor; take ownership of specific team practices or technical components (e.g., a feature store component, leading experimentation reviews). • Educate stakeholders on the capabilities and limitations of data science models, and clearly explain complex methodologies and findings to both technical and non-technical audiences. • Participate actively in recruiting, providing high-quality, graded interview feedback for candidates up to this level.

🎯 Requirements

• B.S. or M.S. in Data Science, Machine Learning, Computer Science, Physics, Mathematics, Operations Research, or a related technical field with 5+ years of relevant industry experience; OR a Ph.D. in a related field with 2+ years of relevant experience. • Demonstrated ability to independently own the full data science lifecycle — from problem formulation and feature engineering through model deployment, monitoring, and ongoing maintenance. • Solid expertise in several core areas of machine learning and/or statistics (e.g., gradient-boosted models, deep neural networks, time series, causal inference, experimentation design), with the judgment to select appropriate methods for complex problems. • Strong foundation in probability and statistics, including techniques that scale to large datasets. • Experience designing and analyzing experiments (e.g., A/B testing) and building robust model and experiment validation frameworks. • Strong Python and SQL skills; experience with ML frameworks such as TensorFlow or PyTorch. • Ability to write efficient, modular, well-tested code and to collaborate with engineering to move models and analyses into production. • Strong communication skills, including the ability to convey complex technical concepts to both technical and non-technical audiences.

🏖️ Benefits

• 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 • 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)