Senior Data Scientist / Machine Learning Engineer

ArcelorMittal · Luxembourg

About ArcelorMittal Global Solutions AI Team

The ArcelorMittal Global Solutions AI Team is a transversal Artificial Intelligence capability enabling business divisions to create measurable value through responsible, production-grade AI and data solutions. We support the full lifecycle of AI initiatives across Finance, HR, Supply Chain, Logistics, Manufacturing, and Operations, while owning technical delivery, quality, and risk controls.

Our portfolio includes document automation, forecasting, optimization, computer vision, predictive maintenance, AI-powered assistants, and GenAI-driven enterprise applications.

Role Summary

As a Senior Data Scientist / Machine Learning Engineer, you will design, build, and operate end-to-end AI and machine learning solutions for the AMGS AI Team.

In the initial phase, you will work hands-on, primarily on Microsoft Azure, performing data analysis, training ML/DL models, and building AI applications, including LLM-powered solutions. As the team grows, you will progressively lead and mentor other data scientists and ML engineers, oversee their work, and ensure high standards of technical quality, robustness, and delivery across AI solutions.

While Azure will be the primary platform, you are expected to expand into AWS over time as AMGS AI solutions evolve.

Key Responsibilities

Hands-on AI / ML Development (Initial Phase)

Analyze structured and unstructured data to extract insights and define AI use cases
Design, train, evaluate, and improve ML and DL models
Build AI solutions across domains such as NLP, computer vision, forecasting, and optimization
Design and implement GenAI solutions using API-based LLMs (e.g. RAG, agents)
Decide on the most appropriate approach (LLMs, classical ML, DL, or hybrid) based on the problem
Develop production-ready AI components and services

AI Engineering & Platform Enablement

Integrate AI models and LLM-based components into applications and workflows
Collaborate with software developers and cloud engineers on deployment and integration
Support monitoring, evaluation, and continuous improvement of AI systems
Contribute to AI architecture, best practices, and reusable components

Technical Leadership (As Team Grows)

Guide and mentor other data scientists and ML engineers
Review code, models, and solution designs
Define and enforce standards for data science, ML engineering, and GenAI development
Ensure development quality, robustness, and maintainability of AI solutions

Cross-Functional Collaboration

Work closely with business analysts, software developers, cloud engineers, and domain experts
Translate business problems into measurable AI and data solutions
Support adoption and change management for AI-driven applications

Required Skills & Experience

AI / ML Expertise

Strong experience in data science and machine learning in production environments
Deep expertise in at least one ML domain (e.g. NLP, Computer Vision, Forecasting)
Broad understanding of other ML domains and techniques
Strong Python programming skills
Experience training, evaluating, and improving ML/DL models

GenAI & Modern AI Patterns

Hands-on experience with LLM-based applications
Up-to-date knowledge of modern GenAI patterns (e.g. RAG, agents, prompt design)
Ability to assess limitations, risks, and trade-offs of GenAI approaches

Cloud & Engineering

Experience developing AI solutions on Azure
Ability and willingness to work with AWS as needed
Solid software engineering fundamentals (modularity, testing, version control)
Ability to work independently and own AI solutions end-to-end

Professional Experience

Proven experience delivering AI/ML solutions in real-world projects
Experience working in cross-functional teams
Experience in complex or enterprise environments

Nice to Have

Experience with MLOps practices and tooling
Experience deploying and monitoring ML models in production
Experience building AI-powered APIs or services
Familiarity with responsible AI, explainability, and model governance

What We Look For in This Role

A hands-on AI engineer who enjoys solving real business problems
A strong data scientist with engineering mindset
A future technical leader who can grow and guide an AI team
Someone who can balance innovation with robustness and maintainability
A pragmatic decision-maker who chooses the right AI approach for each problem

What This Role Is Not

A purely research-focused role
A PoC-only or experimentation-only position
A narrow specialization without system-level thinking

If you enjoy building production-grade AI solutions, working across ML and GenAI, and growing into a technical leadership role, this position offers the opportunity to shape how AI is delivered within AMGS AI.

ArcelorMittal is the world's leading steel and mining company, with a presence in 60 countries and primary steelmaking facilities in 15 countries. Our material is part of the fabric of life. What we produce makes a difference – to individuals, communities, businesses and society. At ArcelorMittal, the safety, health, and wellbeing of our employees are our top priorities. We believe that every accident is avoidable, and it is essential for every employee, from the shop floor to the management committee, to hold this belief.

Our purpose is to produce ever smarter steels that have a positive benefit for people and planet. Steels made using innovative processes which use less energy, emit significantly less carbon and reduce costs. Steels that are cleaner, stronger and reusable. Steels for electric vehicles and renewable energy infrastructure that will support societies as they transform through this century. With steel at our core, our inventive people and an entrepreneurial culture at heart, we will support the world in making that change. This is what we believe it takes to be the steel company of the future.

ArcelorMittal Global Solutions AI Team is looking for a Senior Data Scientist / Machine Learning Engineer.

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