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[Remote] AI Engineer/ML Engineer - Senior Developers - AI Training - Germany

Remote · Poland Full-time

Note: The job is a remote job and is open to candidates in USA. Prolific is building the biggest pool of quality human data in the world. They are seeking AI and Machine Learning Engineers to join their Expert Network to help train and evaluate the next generation of LLMs using deep technical expertise.

Responsibilities

  • Evaluate LLM Architecture Logic: review AI-generated explanations of model architectures, loss functions, and backpropagation for technical accuracy
  • Audit Code & Notebooks: validate ML-specific code (e.g., training loops, data preprocessing scripts, or model evaluations) for efficiency and correctness
  • Refine RLHF Frameworks: provide the high-quality human feedback necessary to align models with human intent, safety, and helpfulness
  • Analyze Model Reasoning: critically assess how an AI model navigates complex chain-of-thought (CoT) prompts and identify where the reasoning breaks down
  • Benchmark Performance: conduct comparative testing between different model outputs based on specific technical taxonomies and performance metrics

Skills

  • A BS, MS, or PhD in Computer Science, Artificial Intelligence, Robotics, or a related quantitative field with a focus on Machine Learning
  • Experience building, deploying, or fine-tuning ML models in a production environment
  • Professional-level understanding of neural network architectures (Transformers, CNNs, RNNs) and optimization techniques
  • Hands-on experience with Prompt Engineering, RLHF (Reinforcement Learning from Human Feedback), or RAG (Retrieval-Augmented Generation) workflows
  • The ability to audit complex model logic, identify training data contamination, and evaluate mathematical proofs behind ML algorithms
  • High attention to detail in spotting 'hallucinations,' biased outputs, or logical failures in AI-generated technical content
  • Expert proficiency in PyTorch or TensorFlow/Keras
  • Advanced Python (NumPy, Pandas, Scikit-learn) and experience with Hugging Face Transformers
  • Experience with AWS (SageMaker), Google Cloud (Vertex AI), or specialized tools like Weights & Biases and LangChain
  • Familiarity with Pinecone, Milvus, or Weaviate for RAG evaluation

Benefits

  • Paid to train and evaluate powerful AI models
  • Competitive pay rates
  • Flexible hours
  • Ability to work from home

Company Overview

  • Building the most advanced global infrastructure for People Science. It was founded in 2014, and is headquartered in London, England, GBR, with a workforce of 51-200 employees. Its website is https://www.prolific.com/.
  • Company H1B Sponsorship

  • Prolific has a track record of offering H1B sponsorships, with 12 in 2025, 7 in 2024, 16 in 2023, 39 in 2022, 16 in 2021, 8 in 2020. Please note that this does not guarantee sponsorship for this specific role.
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