Senior Machine Learning Engineer (AI Training)

About The Role

What if your deep expertise in machine learning could directly shape how AI reasons, plans, and solves complex problems for millions of people? We're looking for Senior Machine Learning Engineers to author high-fidelity reasoning traces that teach cutting-edge LLMs how to think — step by step, decision by decision.

This is a fully remote, versátil contract role built for experienced ML professionals who understand model behavior at a deep level and can translate that understanding into structured, actionable training data.

Organization: Alignerr
Type: Hourly Contract
Location: Remote
Commitment: 10–40 hours/week

What You'll Do

Author complex, high-fidelity reasoning traces that capture how an AI should plan, use tools, and make decisions across sophisticated real-world tasks
Decompose difficult technical problems into clear, logical, well-documented steps that serve as ground truth for model training
Review and mentor the quality of structured traces produced by others, ensuring accuracy, consistency,



and optimal planning documentation
Design data strategies that help LLMs navigate intricate, multi-step decision-making scenarios
Collaborate with a global team of ML professionals working at the frontier of AI research

Who You Are

Experienced machine learning engineer or researcher with a strong foundation in model reasoning, training, or evaluation
Able to break down complex, ambiguous problems into structured, logical reasoning chains
Deeply familiar with how LLMs work — including their failure modes, capabilities, and training dynamics
Detail-oriented and rigorous in your thinking — you care about getting things exactly right
A clear, precise written communicator who can articulate complex reasoning accessibly
Self-directed and productive when working independently in an async environment

Nice to Have

Prior experience with data annotation, data quality workflows, or model evaluation systems
Fam

📌 Senior Machine Learning Engineer (España)
🏢 Alignerr
📍 España