Prolific

Prolific

AI Engineer/ML Engineer - Senior Developers - AI Training - Sacramento, US

Sacramento, California · Senior

Work authorization required$51k-$200kDetected 11 days ago
PythonAlgorithmsVector DatabasesAWSGCPMachine LearningDeep LearningTensorFlowPyTorchscikit-learnPandasNumPyNLPLLMsRAGMLOpsRobotics

About the role

  • They are seeking AI and Machine Learning Engineers to help train and evaluate the next generation of LLMs using deep technical expertise.
  • 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.

Responsibilities

  • Audit Code & Notebooks: validate ML-specific code (e.g., training loops, data preprocessing scripts, or model evaluations) for efficiency and correctness
  • Building the most advanced global infrastructure for People Science.

Requirements

  • the ability to audit complex model logic, identify training data contamination, and evaluate mathematical proofs behind ML algorithms
  • 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

Skills

  • Frameworks: expert proficiency in PyTorch or TensorFlow/Keras
  • Language & Data: advanced Python (NumPy, Pandas, Scikit-learn) and experience with Hugging Face Transformers
  • Cloud & MLOps: experience with AWS (SageMaker), Google Cloud (Vertex AI), or specialized tools like Weights & Biases and LangChain
  • Vector Databases: familiarity with Pinecone, Milvus, or Weaviate for RAG evaluation
  • provide the high-quality human feedback necessary to align models with human intent, safety, and helpfulness

Compensation

  • $51k-$200k

Benefits

  • Flexible hours

Company info

  • It was founded in 2014, and is headquartered in London, England, GBR, with a workforce of 51-200 employees.

Visa & Work Authorization

  • 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.
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This listing is sourced directly from Prolific's careers page and normalized into a canonical job model.