Senior ML/AI Engineer (f/m/d) - Data Science

At IONOS, the leading European provider of cloud infrastructure, cloud services and hosting services, you will work together with a wide range of teams. We are characterized by open structures, a friendly working culture and flat hierarchies with a strong team spirit. We firmly believe that work and fun are compatible, and offer you the right environment for this. Our constant growth means that we are always looking for new colleagues. Become part of IONOS and grow with us.

Tasks

We are seeking an ambitious individual to enrich our Machine Learning/AI team in the realm of AdTech Solutions.

• Development and optimization of ML/AI solutions in the booming AdTech market, such as revenue optimization of advertising campaigns, automated analysis of advertisements, and automated content creation.

• Proactive coordination of project details with stakeholders in various departments.

• Designing and developing tailored solutions by combining traditional ML methods with the latest LLM approaches.

• Covering all phases of ML projects: acquiring domain knowledge, building the data foundation, selecting appropriate methods, training and evaluating models, and integrating them into existing processes.

Qualifications

• Strong ability to act independently and a willingness and capacity to acquire new knowledge purposefully.

• Proactive and confident communication skills in German and English (fluent in one, B2+ level in the other).

• Degree in a relevant field (e.g., Data Science, Computer Science, Statistics, Psychology with a quantitative focus).

• At least 4 years of professional experience in the ML/AI field.

• Ideally, proven success in ML projects with measurable economic value.

• Excellent knowledge and practical experience with Python and common machine learning libraries such as Scikit-Learn, XGBoost, Keras, and/or Pytorch, as well as LLM-specific tooling (Langchain, vector databases, etc.).

• In-depth knowledge of LLM usage, including observability/monitoring aspects.

• Knowledge in SQL.

• Experience in ML Operations and the Machine Learning Lifecycle (e.g., model and data version control, evaluation of machine learning systems, model deployment, etc.).

• Practical experience with Linux systems.

• Good coding practices and ideally foundational knowledge in software development.

Benefits

• Hybrid working model with home office option.

• Flexible working hours through trust-based working hours.

• Subsidised canteen and various free drinks at some locations.

• Modern office space with excellent transport links.

• Various employee discounts for activities and products.

• Employee events such as summer and winter parties and workshops.

• Numerous training and development opportunities.

• Various health programmes, such as sports and health courses.

About IONOS

IONOS is the leading European digitalization partner for small and medium-sized businesses (SMB). The company serves around six million customers and operates across 18 markets in Europe and North America, with its services being accessible worldwide. With its Web Presence & Productivity portfolio, IONOS acts as a 'one-stop shop' for all digitalization needs: from domains and web hosting to classic website builders and do-it-yourself solutions, from e-commerce to online marketing tools. In addition, the company offers Cloud Solutions to enterprises who are looking to move to the cloud as their businesses evolve.

We value diversity and welcome all applications - regardless of, for example, gender, nationality, ethnic or social origin, religion, disability, age as well as sexual orientation and identity, physical characteristics, marital status or any other irrelevant factor subject to applicable law.