Machine Learning Engineer
At a glance
Mid-level Machine Learning Engineering role at Shalion. Barcelona · full-time.
Pay not stated Machine Learning Engineer salary
aimlroles summary, based on the employer's posting.
What you'll do
- Take machine learning systems through deployment and ongoing monitoring
- Turn existing models and notebooks into modular, tested code that can run reliably in production
- Set coding, testing and model-versioning practices, then improve the CI/CD workflows that support ML systems
- Coordinate with data scientists and data engineers to keep interfaces clear and data flows dependable
- Review code and support less experienced teammates as a technical point of reference
What you bring
- You have built and deployed machine learning systems in production settings
- You write strong Python software, with attention to readable, maintainable and testable code
- You have taken models from notebooks into production and understand the model development lifecycle
Who this fits
This role suits a mid-level machine learning engineer who can turn research work into robust production systems and bring structure to ambiguous work. You’ll work in a hybrid setup, with three days in the Barcelona office and two remotely. The role includes reviewing code and guiding less experienced team members.
From the employer
Shalion is a data and insights-driven company that serves world-class manufacturers and brands globally. Through our Digital Shelf Optimization, Retail Media, and Food Service Aggregators solutions, we provide innovative tools for e-commerce monitoring.
At Shalion, we empower brands to make smarter business decisions in eCommerce by delivering actionable data and insights on online product prices, availability, share of search, and more. We operate across 1000+ e-retailers in 60+ countries, serving industry giants such as Heineken, Lego, Danone, Nestlé, and JDE.
As a leader in data intelligence, we specialize in gathering, analyzing, and applying proprietary artificial intelligence to deliver relevant data and monitoring tools, helping our clients maximize their e-commerce performance.
The role
As a Machine Learning Engineer, you will join our Data Science team and play a key role in transforming research-driven work into robust, production-ready systems. You will help elevate the team’s engineering maturity, promote best practices, and ensure that models are scalable, maintainable, and deliver real business impact.
Your 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, and testable code.
Introduce and enforce best practices in coding, testing, model versioning
Set up and improve CI/CD workflows for ML systems.
Work closely with Data Scientists and Data Engineers to ensure clean interfaces and reliable data flows
Act as a technical reference within the team, reviewing code and guiding less experienced members.
Experience building and deploying ML systems in production environments
Strong software engineering skills in Python, with a focus on writing clean, maintainable, and testable code
Proven experience taking models from notebook to production
Solid understanding of model development lifecycle
(Bonus) Familiarity with containerization (Docker)
(Bonus) Experience with cloud environments (AWS preferred) and data platforms such as Snowflake
Pragmatic and solution-oriented: you focus on what works in production, not just in theory
Comfortable working in ambiguous environments and bringing structure where needed
Quality-driven mindset with attention to maintainability and long-term scalability
Interview process:
First interview: Intro & mutual fit
Second interview: Technical discussion
Third interview: Deep dive with Tech Lead
🌍 An international team – Work with colleagues from 10+ nationalities.
🚀 A dynamic and innovative environment – Be part of a high-performing team.
🏢 Hybrid work model – 3 days in-office, 2 days remote.
💡 Impactful work – Contribute to a challenging and innovative project.
🎟 Flexible benefits – allocate part of your gross salary (pre-tax) to meal vouchers, transport allowance, and private healthcare at a preferential rate.
🍏 Office perks – Fresh fruit and specialty coffee daily.
📄 Contract: Permanent
📍 Great location – Office in Barcelona’s Sarrià-Sant Gervasi district.
Shalion Data Services Limited is an equal-opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.
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Machine Learning Engineering
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