Machine Learning Engineer (AI Data Trainer)
About The Role
What if your technical expertise could directly influence how the world's most advanced AI systems learn to reason, plan, and solve problems? We're looking for Machine Learning Engineers to help train cutting-edge AI models by demonstrating expert-level problem-solving — step by step, tool by tool, decision by decision.
Machine Learning Engineer (AI Data Trainer)
About The Role
What if your technical expertise could directly influence how the world's most advanced AI systems learn to reason, plan, and solve problems? We're looking for Machine Learning Engineers to help train cutting-edge AI models by demonstrating expert-level problem-solving — step by step, tool by tool, decision by decision.
This isn't a typical ML engineering role. You'll be working at the frontier of AI development, producing the high-quality reasoning data that teaches large language models how to think like an expert. Your work will have a direct, lasting impact on how AI handles real-world technical challenges.
This is a fully remote, flexible contract role built for experienced technical professionals who want to contribute to something genuinely significant.
Organization: Alignerr
Type: Hourly Contract
Location: Remote
Commitment: 10–40 hours/week
What You'll Do
Construct precise, well-structured reasoning logs that walk through complex technical problems — capturing your strategy, tool use, and decision‑making at each step
Demonstrate how an expert approaches sophisticated ML and engineering challenges, producing training data that shows AI models how to reason consistently and reliably
Generate annotated workflows that illustrate proficient tool interaction,



from problem framing through to solution execution
Review and critically evaluate AI‑generated reasoning sequences, identifying gaps, errors, and opportunities for improvement
Produce high‑quality training datasets that directly improve LLM performance on real‑world technical tasks
Who You Are
Professional background in Machine Learning, Software Engineering, or a closely related technical discipline
Able to clearly articulate complex reasoning processes — you can explain not just what you did, but why, step by step
Strong critical thinker with the ability to evaluate and refine AI‑generated problem‑solving approaches
Comfortable working independently and asynchronously with minimal supervision
Detail‑oriented and methodical — you care about precision and consistency
Nice to Have
Master's Degree or PhD in Machine Learning, Computer Science, or a related technical field
Prior experience with data annotation, data quality assurance, or AI evaluation systems
Familiarity with LLMs, prompt engineering, or AI reasoning frameworks
Experience documenting technical workflows or writing technical specifications
Why Join Us
Work directly with leading AI research labs on projects shaping the next generation of AI
Fully remote and adaptable — structure your hours around your life, not the other way around
Freelance autonomy: choose your own pace, work asynchronously, and collaborate globally
Gain deep, hands‑on exposure to how frontier LLMs are built and trained
Contribute to work that genuinely matters — your expertise helps make AI smarter and more reliable for everyone
Potential for ongoing work and contract extension as new projects launch
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📌 Machine Learning Engineer (Madrid)
🏢 Alignerr
📍 Madrid