Senior Machine Learning Expert (AI Training)

About The Role

What if your deep expertise in machine learning could directly shape how the world's most advanced AI systems think, plan, and solve problems? We're looking for Senior Machine Learning Experts to author the reasoning traces that teach LLMs how to reason step by step - turning your technical intuition into the training data that powers next-generation AI.

This is a fully remote, versátil contract role designed for experienced ML practitioners who understand how models make decisions and want to influence that process from the inside.

Organization: Alignerr
Type: Hourly Contract
Location: Remote

Commitment: 10-40 hours/week

What You'll Do

Author complex, high-fidelity reasoning traces that document how an LLM should plan, use tools, and make decisions across sophisticated technical tasks

Break down intricate real-world problems into clear, structured, logical steps that models can learn from

Design and contribute to data strategies that help LLMs navigate multi-step decision-making scenarios reliably

Review and refine reasoning traces for quality, completeness, and alignment with best practices in model training

Apply your architectural and systems-level ML knowledge to ensure traces reflect how expert practitioners actually think

Who You Are

Experienced in machine learning,



AI research, or a closely related technical field - you understand how models reason and where they fail

Skilled at decomposing hard problems into clear, documented, logical steps

Familiar with LLM evaluation methodologies, training pipelines, or RLHF-style workflows

Detail-oriented and rigorous - you care about getting things exactly right

Comfortable working independently and asynchronously in a remote environment

Nice to Have

Prior experience in data annotation, data quality, or AI evaluation systems

Top-tier Kaggle competition results (Grandmaster or Master level), demonstrating elite-level understanding of model performance and feature engineering

Background in NLP, reasoning systems, or agent-based model development

Experience writing technical documentation or structured problem-solving guides

Why Join Us

Work on some of the most technically challenging AI problems in the industry alongside leading research labs

Fully remote and flexible - work when and where it suits you

Freelance autonomy with the structure and purpose of meaningful, high-impact work

Gain deep, hands-on exposure to how frontier LLMs are trained and evaluated

Potential for ongoing work and contract extension as new projects launch

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📌 Senior Machine Learning Expert (Málaga)
🏢 Alignerr
📍 Málaga