Machine Learning Engineer

About the role

Shalion, a data and insights company serving global manufacturers and brands through Digital Shelf Optimization, Retail Media and Food Service Aggregators solutions, is hiring a Machine Learning Engineer for its Data Science team in Barcelona. The engineer turns research-driven work into robust, production-ready systems, raises the team's engineering maturity and ensures models are scalable, maintainable and impactful.

Key responsibilities

• Own the end-to-end lifecycle of ML systems, with focus on deployment and monitoring.
• Refactor and productionize existing models and notebooks into clean, modular, testable code.
• Introduce and enforce best practices in coding, testing and model versioning.
• Set up and improve CI/CD workflows for ML systems.
• Work with Data Scientists and Data Engineers to ensure clean interfaces and reliable data flows.
• Act as a technical reference, reviewing code and guiding less experienced members.

Required profile

• Experience building and deploying ML systems in production environments.
• Proven experience moving models from notebook to production.
• Solid understanding of the model development lifecycle.
• Pragmatic, solution-oriented approach focused on what works in production; comfortable in ambiguous environments and quality-driven.

Required skills

• Strong software engineering in Python, with clean, maintainable and testable code.
• Bonus: familiarity with containerization (Docker).
• Bonus: experience with cloud environments (AWS preferred) and data platforms such as Snowflake.

What we offer

• Permanent contract in the Sarrià-Sant Gervasi district of Barcelona.
• Hybrid work: 3 days in office, 2 days remote.
• International team with colleagues from 10+ nationalities.
• Flexible benefits: pre-tax allocation of part of gross salary to meal vouchers, transport allowance and private healthcare.
• Fresh fruit and specialty coffee daily.