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

Prolific Academic Ltd; United States; Remote; USD 91,000 - 129,000; Full time

Job summary

Prolific is seeking AI & Machine Learning Engineers to join its Expert Network to train and evaluate the next generation of LLMs with deep technical expertise. You’ll complete a brief test and, if selected, join Prolific as a participant, paid to train and evaluate AI models from home.

Responsibilities include auditing ML code, refining RLHF frameworks, and evaluating reasoning and architecture logic for accuracy. Competitive hourly pay and flexible hours offered.

Qualifications

• Experience building or fine-tuning ML models in production.
• Deep learning architectures (Transformers, CNNs, RNNs) mastery.
• Hands-on experience with Prompt Engineering, RLHF or RAG workflows.
• Ability to audit model logic, detect data contamination, and evaluate proofs.
• Strong attention to detail in spotting hallucinations and biases.

Responsibilities

• Evaluate LLM Architecture Logic: review architecture explanations for technical accuracy.
• Audit Code & Notebooks: validate training loops and data preprocessing scripts.
• Refine RLHF Frameworks: provide high-quality human feedback for alignment.
• Analyze Model Reasoning: assess chain-of-thought prompts and breakdowns.
• Benchmark Performance: compare model outputs using technical metrics.

Skills

Education degree

ML experience

DL mastery

LLM specialization

Model auditing

Analytical critique

Education

BS/MS/PhD in CS/AI/Robotics

Tools

PyTorch

TensorFlow/Keras

Python

Hugging Face Transformers

SageMaker

LangChain

Pinecone

Job description

AI & Machine Learning Engineer - AI Training

About Prolific

Prolific is not just another player in the AI space – we are building the biggest pool of quality human data in the world.

Over 35,000 AI developers, researchers, and organizations use Prolific to gather data from paid study participants with a wide variety of experiences, knowledge, and skills.

The role

We’re looking for AI and Machine Learning Engineers to join our Expert Network to help train and evaluate the next generation of LLMs using deep technical expertise. If you have the necessary experience, we’ll send you a quick 10- to 15-minute test to assess your skills and suitability for AI tasks. If successful, you’ll be invited to join Prolific as a participant, where you’ll get paid to train and evaluate powerful AI models.

Researchers looking for your skills tend to pay up to $80 per hour. You must be prepared to complete paid tasks that require one hour of uninterrupted work, though many are shorter.

What you’ll bring

• Education: a BS, MS, or PhD in Computer Science, Artificial Intelligence, Robotics, or a related quantitative field with a focus on Machine Learning.
• Professional Experience: experience building, deploying, or fine-tuning ML models in a production environment.
• Deep Learning Mastery: professional-level understanding of neural network architectures (Transformers, CNNs, RNNs) and optimization techniques.
• LLM Specialization: hands‑on experience with Prompt Engineering, RLHF (Reinforcement Learning from Human Feedback), or RAG (Retrieval-Augmented Generation) workflows.
• Technical Rigor: the ability to audit complex model logic, identify training data contamination, and evaluate mathematical proofs behind ML algorithms.
• Analytical Critique: high attention to detail in spotting “hallucinations,” biased outputs, or logical failures in AI-generated technical content.

What you’ll be doing in the role

• 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.

Key Technologies

• 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.

Why Prolific is a great platform to join as a Participant

Joining our Expert Network will give you the chance to influence the AI models of the future using professional legal expertise. Once you pass our assessment, you can join Prolific in just 15 minutes, and start enjoying competitive pay rates, flexible hours, and the ability to work from home.

We’ve built a unique platform that connects researchers and companies with a global pool of participants, enabling the collection of high-quality, ethically sourced human behavioural data and feedback. This data is the cornerstone of developing more accurate, nuanced, and aligned AI systems.

We believe that the next leap in AI capabilities won’t come solely from scaling existing models, but from integrating diverse human perspectives and behaviours into AI development. By providing this crucial human data infrastructure, Prolific is positioning itself at the forefront of the next wave of AI innovation – one that reflects the breadth and the best of humanity.

Links to more information on Prolific

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