Data engineer for RTB

We are building the “brain” of an RTB bidder — a system that buys advertising space in real-time auctions on behalf of e-commerce clients. Our ML models decide which campaign to display, what the ad should look like, and whether and how much to bid. We operate at a large scale: hundreds of thousands of requests per second, tens of billions of ML model decisions per day, and hundreds of millions of auction log rows entering the database every day. As a Data Engineer, you will develop processes that deliver data to these models.

• Building and optimizing processes that feed data to models.
• Designing and optimizing the data storage layer, including schemas and indexing for analytics performance and Real-Time systems.
• Creating an observability layer for input data, including dashboards and alerts that detect anomalies and declines in the quality of data feeding models.
• Developing tools for monitoring production models, including detecting distribution shift.
• Implementing CI/CD practices that support the process of creating, testing, and deploying predictive models.

• At least 3 years of commercial experience in Data Engineering or a related role involving data processing.
• Very good knowledge of Python and SQL.
• Experience processing large volumes of data using tools such as Spark and Polars.
• Experience with columnar analytical databases.
• Strong technical skills: programming skills supported by an understanding of how complex systems work.
• Experience working in a sector that operates with large-scale data.
• Experience designing and modeling data structures for advanced analytics and systems operating in near real time.
• Будет плюсом: Knowledge of specific analytical engines: ClickHouse and/or StarRocks; Knowledge of Kubernetes and GitOps tools (ArgoCD); Experience in the RTB (Real-Time Bidding) or programmatic advertising industry; Experience in machine learning (ML) projects; Knowledge of Go (Golang)

• Work for a technology leader and first-choice partner — we create content, services, and entertainment that accompany millions of Poles every day.
• Free access to our products, such as Pilot WP and Audioteka — we want you to feel part of what we create.
• Worksmile and a flexible benefits package — you choose what matters to you.
• Access to free and anonymous psychological consultations.
• Possibility of hybrid work — we work 3 days in the office and 2 days from home, combining the freedom of remote work with the best of the office.
• Events that bring us closer — from seasonal activities (Children’s Day is our favorite!) to webinars on health and neurodiversity.
• Opportunity to develop through training as part of the WP Academy program.
• A chance to take on new challenges and explore new directions within WP Holding companies — internal recruitment opportunities are within reach.