Senior AI/ML Engineer at SumUp

At SumUp, the Senior AI/ML Engineer role is critical for developing and deploying the next generation of AI-driven solutions that automate support and improve the experience for both merchants and support agents.

What You'll Be Doing

Lead the Operations AI team designing and deploying scalable ML/AI solutions in production

Architect, design, develop, and deploy AI systems ensuring reliability, high performance, and scalability

Own development and maintenance of core AI products: AI Assistant (automating ~40% of merchant requests), AI Translation (enabling cross-language agent service), and AI Agent Copilot

Develop and maintain ML infrastructure and pipelines for data processing, model training, serving, and monitoring

Optimize and fine-tune machine learning models; manage large text datasets

Apply software development best practices including Git, CI/CD, and unit testing

Collaborate with Data Scientists, Product Managers, Developers, and stakeholders

Rapidly master existing AI assistant infrastructure; work on behaviour improvements and agentic rollouts

Lead Voice Assistant pilot and innovation initiatives

Requirements

7+ years as ML/AI Engineer building production systems

Expert Python proficiency and software engineering skills

Experience with GenAI/LLM APIs and production LLM evaluation

Cloud platform experience (AWS, GCP, or Azure)

MLOps tools familiarity (MLFlow, Kubeflow, Airflow, Langfuse)

Kubernetes, Git, Airflow hands-on experience

Data pipeline and API design expertise

Docker and CI/CD pipeline knowledge

Location: Berlin, Germany. Posted: November 28, 2025.