Senior ML Engineer (m/f/d) in Köln

• Work with colleagues from our Data & AI department and collaborate closely with product managers, engineers, and commercial stakeholders.
• Design, build, and operate machine learning systems for retail media use cases such as sponsored product ranking, audience segmentation, campaign optimization, attribution, and performance measurement.
• Translate business and product requirements into scalable ML solutions, balancing model quality, latency, reliability, scalability, and maintainability.
• Develop robust ML pipelines for feature engineering, training, evaluation, deployment, monitoring, and continuous model improvement.
• Bring models into production using our cloud-based stack and ensure they are reliable, observable, and maintainable over time.
• Communicate technical decisions, assumptions, limitations, and uncertainty clearly to product, engineering, and business stakeholders.
• Contribute to ML engineering standards, best practices, and knowledge sharing within the team.

About you:

• You have several years of hands‑on experience as a Machine Learning Engineer, ML‑focused Software Engineer, or Data Scientist with strong engineering experience.
• You have built and operated production‑grade machine learning systems, pipelines, or model‑based products.
• You have experience working with retail media, or alternatively recommender systems or ranking.
• You are comfortable working with complex data and understand common ML failure modes such as data leakage, feedback loops, distribution shifts, and misleading offline metrics.
• You enjoy working close to the business and can explain complex technical topics clearly to non‑technical stakeholders.
• You take ownership, work proactively, and are comfortable navigating ambiguity in an early‑stage product environment.
• You value collaboration, give and receive feedback openly, and enjoy helping others grow.

In order to provide our employees with the best possible support for their individual needs, we offer a wide range of benefits:

• Sports: Stay healthy. Profit from a membership (M) package at Urban Sports Club, so that you can take advantage of a huge variety of sport offers.
• Mental Health: Get quick and professional help from psychologists of Likeminded if you feel overwhelmed in private or professional life. Anonymous and free of charge.
• Work from Home: If your job does not require you to be present in the office, we can arrange the place you work from individually - even for up to 20 days a year anywhere in the EU.
• Mobility: We provide our employees with a fully costed Deutschland Ticket which can be used at any time. Click here to learn more.
• Personal development: Grow! We support and encourage your individual development through various in- and external trainings.
• And many more

#J-18808-Ljbffr