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About the Role

The Senior AI/ML Engineer role is critical for developing and deploying the next generation of AI-driven solutions that automate support and drastically improve the experience for both our merchants and support agents. You will be a key expert who builds and maintains the ML infrastructure and tooling that powers our core products using advanced AI/ML models. This role is essential for maintaining momentum as we expand complex use cases like our AI Assistant and translation tools.

Responsibilities

Serve as the dedicated technical leader for the Operations AI team, focused on designing, developing, and deploying high-performance, scalable ML/AI solutions in production environments.
Architect, design, develop, and deploy AI solutions and systems into production environments, ensuring reliability, high performance, and scalability.
Take ownership and technical leadership in the development and maintenance of main AI products, including the AI Assistant, AI Translation, and the AI Agent Copilot.
Develop and maintain ML infrastructure and pipelines to support efficient data processing, model training, serving, and continuous monitoring.
Optimize and fine-tune machine learning models, and collect, preprocess, and clean large text datasets.
Embrace software development principles, best practices, and industry standards, including version control (Git), CI/CD processes (GitHub actions), and unit testing frameworks.
Collaborate closely with Data Scientists, Product Managers, Developers, and other business stakeholders to enhance customer experience and improve operational efficiency globally.
Rapidly master a large, existing AI assistant infrastructure, starting immediately with working on behavior improvements and agentic rollouts.
Lead the creation of the pilot for the Voice Assistant and design how to leverage current AI assistant components to empower new channels.

Requirements

7+ years of proven experience as a Machine Learning Engineer or AI Engineer, focusing on building and deploying scalable machine learning or AI solutions and data-driven systems.
Expert-level Python proficiency and excellent software development engineering skills for designing computationally effective solutions in large-scale production.
Strong previous experience as an ML or AI engineer, with models in production, and a strong understanding of artificial intelligence, machine learning, and deep learning concepts.
Experience using GenAI / LLM API and experience evaluating LLM models in production.
Experience building and deploying ML Models using Cloud platforms (AWS, GCP, or Azure).
Familiarity with MLOps tools (e.g., MLFlow, Kubeflow, Airflow, Langfuse), and hands-on experience with Kubernetes, Git, and Airflow.
Good understanding of data pipelines, API design, containers (Docker), and version control (Git).
Experience building, maintaining, and scaling APIs, and deployment using CI/CD Pipelines in GitHub actions.
A true team player attitude who thrives on cross-functional collaboration.
Self-drive, proactiveness, and high adaptability in a fast-paced environment, with a commitment to data governance, quality, and ownership.
A passion for AI Technology, excited to power SumUp's next generation of automated support tools, and able to translate complex concepts to non-technical stakeholders.

Skills

Python
Machine Learning
AI
Deep Learning
GenAI
LLM API
Cloud platforms (AWS, GCP, or Azure)
MLOps tools (MLFlow, Kubeflow, Airflow, Langfuse)
Kubernetes
Git
Airflow
Data pipelines
API design
Docker
CI/CD
GitHub actions

Location

Berlin

Work Type

Office-first

Experience Level

Senior

Benefits

Virtual Stock Option programme
Dedicated annual L&D budget of €2000
Corporate pension scheme with up to 20% company match
28 days of paid leave plus public holidays and special leave days
Urban Sports Club subsidy
Kita placement assistance
Subsidised office lunches
1-month sabbatical after 3 years of service
Referral Bonus

About the Company

At SumUp, we're on a mission to empower small businesses around the world with simple, affordable tools to help them start, run, and grow.
More than 4 million merchants across 36 markets trust us as their financial partner — and we’re just getting started.
We’re a global team of 3,000+ people from over 90 nationalities, united by curiosity, collaboration, and care.
Our core values and culture shape everything we do, fostering inclusion, learning, and belonging.

Equal Opportunity

SumUp is proud to be an Equal Employment Opportunity employer, committed to building a safe, respectful, and diverse workplace where everyone can thrive.