Senior ML Engineer, Retail Media

Location: Cologne, Germany. Individual work-from-home arrangements may be available, including up to 20 days per year anywhere in the EU.

Company

hirify.global is a leading European e-pharmacy developing digital health and retail solutions.

What you will do

• Design, build, and operate machine learning systems for retail media use cases, including sponsored product ranking, audience segmentation, campaign optimization, attribution, and performance measurement.
• Translate product and business requirements into scalable ML solutions while balancing model quality, latency, reliability, scalability, and maintainability.
• Develop pipelines for feature engineering, training, evaluation, deployment, monitoring, and continuous model improvement.
• Bring models into production using a cloud-based stack and ensure they remain reliable, observable, and maintainable.
• Collaborate with Data & AI colleagues, product managers, engineers, and commercial stakeholders.
• Communicate technical decisions, assumptions, limitations, and uncertainty, and contribute to ML engineering standards and knowledge sharing.

Requirements

• Several years of hands-on experience as a Machine Learning Engineer, ML-focused Software Engineer, or Data Scientist with strong engineering experience.
• Experience building and operating production-grade machine learning systems, pipelines, or model-based products.
• Experience with retail media, recommender systems, or ranking.
• Understanding of complex data and ML failure modes, including data leakage, feedback loops, distribution shifts, and misleading offline metrics.
• Ability to explain complex technical topics clearly to non-technical stakeholders and work effectively in an ambiguous early-stage product environment.
• Strong ownership, proactive collaboration, openness to feedback, and interest in helping others grow.

Culture & Benefits

• Collaborative work with Data & AI, product, engineering, and business teams.
• Individual work-from-home arrangements where the role allows it, including up to 20 days per year anywhere in the EU.
• Urban Sports Club membership package.
• Anonymous, free professional mental health support through Likeminded.
• Fully funded Deutschland Ticket.
• Support for individual development through internal and external training.