Machine Learning Engineer
Salem, OR · On-site
We curated OpenThoughts, one of the best open reasoning datasets, and have trained SOTA models such ... train/eval contamination
Salem, OR · On-site
We curated OpenThoughts, one of the best open reasoning datasets, and have trained SOTA models such ... train/eval contamination
Salem, OR · On-site
We curated OpenThoughts, one of the best open reasoning datasets, and have trained SOTA models such ... train/eval contamination
Gresham, OR · On-site
We curated OpenThoughts, one of the best open reasoning datasets, and have trained SOTA models such ... train/eval contamination
Gresham, OR · On-site
We curated OpenThoughts, one of the best open reasoning datasets, and have trained SOTA models such ... train/eval contamination
We curated OpenThoughts, one of the best open reasoning datasets, and have trained SOTA models such ... train/eval contamination
We curated OpenThoughts, one of the best open reasoning datasets, and have trained SOTA models such ... train/eval contamination
We curated OpenThoughts, one of the best open reasoning datasets, and have trained SOTA models such ... train/eval contamination
We curated OpenThoughts, one of the best open reasoning datasets, and have trained SOTA models such ... train/eval contamination
Portland, OR · On-site +1
$80/hr
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
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Portland, OR · On-site +1
$80/hr
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
Portland, OR · Remote
$120/hr
The role We are looking for Licensed Pharmacists to help train and evaluate cutting-edge AI models. As AI begins to play a larger role in healthcare, these systems must be guided by pharmaceutical ...
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Portland, OR · Remote
$120/hr
The role We are looking for Licensed Pharmacists to help train and evaluate cutting-edge AI models. As AI begins to play a larger role in healthcare, these systems must be guided by pharmaceutical ...
Portland, OR · On-site +1
$45 - $90/hr
The role We're looking for Environmental Researchers and Sustainability Experts to join our Expert Network to help train and evaluate cutting-edge AI models using real-world ecological and climate ...
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Portland, OR · On-site +1
$45 - $90/hr
The role We're looking for Environmental Researchers and Sustainability Experts to join our Expert Network to help train and evaluate cutting-edge AI models using real-world ecological and climate ...
Portland, OR · Remote
$100/hr
The role We're looking for Legal Subject Matter Experts to join our Expert Network to help train and evaluate cutting-edge AI models using professional legal insight. If you have a legal background ...
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Portland, OR · Remote
$100/hr
The role We're looking for Legal Subject Matter Experts to join our Expert Network to help train and evaluate cutting-edge AI models using professional legal insight. If you have a legal background ...
Eugene, OR · Remote
$25/hr
The role We're looking for AI Training Experts to help train and evaluate cutting-edge AI models. If you have the necessary experience, we'll send you a quick 10- to 15-minute test to assess your ...
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Eugene, OR · Remote
$25/hr
The role We're looking for AI Training Experts to help train and evaluate cutting-edge AI models. If you have the necessary experience, we'll send you a quick 10- to 15-minute test to assess your ...
Salem, OR · Remote
$25/hr
The role We're looking for AI Training Experts to help train and evaluate cutting-edge AI models. If you have the necessary experience, we'll send you a quick 10- to 15-minute test to assess your ...
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Salem, OR · Remote
$25/hr
The role We're looking for AI Training Experts to help train and evaluate cutting-edge AI models. If you have the necessary experience, we'll send you a quick 10- to 15-minute test to assess your ...
Medford, OR · Remote
$25/hr
The role We're looking for AI Training Experts to help train and evaluate cutting-edge AI models. If you have the necessary experience, we'll send you a quick 10- to 15-minute test to assess your ...
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Medford, OR · Remote
$25/hr
The role We're looking for AI Training Experts to help train and evaluate cutting-edge AI models. If you have the necessary experience, we'll send you a quick 10- to 15-minute test to assess your ...
Gresham, OR · Remote
$25/hr
The role We're looking for AI Training Experts to help train and evaluate cutting-edge AI models. If you have the necessary experience, we'll send you a quick 10- to 15-minute test to assess your ...
Quick apply
Gresham, OR · Remote
$25/hr
The role We're looking for AI Training Experts to help train and evaluate cutting-edge AI models. If you have the necessary experience, we'll send you a quick 10- to 15-minute test to assess your ...
Bend, OR · Remote
$25/hr
The role We're looking for AI Training Experts to help train and evaluate cutting-edge AI models. If you have the necessary experience, we'll send you a quick 10- to 15-minute test to assess your ...
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Bend, OR · Remote
$25/hr
The role We're looking for AI Training Experts to help train and evaluate cutting-edge AI models. If you have the necessary experience, we'll send you a quick 10- to 15-minute test to assess your ...
Hillsboro, OR · Remote
$25/hr
The role We're looking for AI Training Experts to help train and evaluate cutting-edge AI models. If you have the necessary experience, we'll send you a quick 10- to 15-minute test to assess your ...
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Hillsboro, OR · Remote
$25/hr
The role We're looking for AI Training Experts to help train and evaluate cutting-edge AI models. If you have the necessary experience, we'll send you a quick 10- to 15-minute test to assess your ...
Portland, OR · Remote
$25/hr
The role We're looking for AI Training Experts to help train and evaluate cutting-edge AI models. If you have the necessary experience, we'll send you a quick 10- to 15-minute test to assess your ...
Quick apply
Portland, OR · Remote
$25/hr
The role We're looking for AI Training Experts to help train and evaluate cutting-edge AI models. If you have the necessary experience, we'll send you a quick 10- to 15-minute test to assess your ...
Beaverton, OR · Remote
$25/hr
The role We're looking for AI Training Experts to help train and evaluate cutting-edge AI models. If you have the necessary experience, we'll send you a quick 10- to 15-minute test to assess your ...
Quick apply
Beaverton, OR · Remote
$25/hr
The role We're looking for AI Training Experts to help train and evaluate cutting-edge AI models. If you have the necessary experience, we'll send you a quick 10- to 15-minute test to assess your ...
Portland, OR · On-site +1
$40/hr
The role We're looking for Materials Science Specialists to join our Expert Network to help train and evaluate cutting-edge AI models using real scientific expertise. If you have a background in ...
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Portland, OR · On-site +1
$40/hr
The role We're looking for Materials Science Specialists to join our Expert Network to help train and evaluate cutting-edge AI models using real scientific expertise. If you have a background in ...
$110K - $148K/yr
Work with on-site project team to update models to reflect as-built conditions * Utilize Revit ... Manage, train, and supervise project team on creation, manipulation & updating of layout, detailing ...
$110K - $148K/yr
Work with on-site project team to update models to reflect as-built conditions * Utilize Revit ... Manage, train, and supervise project team on creation, manipulation & updating of layout, detailing ...
Portland, OR · On-site
$110K - $148K/yr
Work with on-site project team to update models to reflect as-built conditions * Utilize Revit ... Manage, train, and supervise project team on creation, manipulation & updating of layout, detailing ...
Portland, OR · On-site
$110K - $148K/yr
Work with on-site project team to update models to reflect as-built conditions * Utilize Revit ... Manage, train, and supervise project team on creation, manipulation & updating of layout, detailing ...
Portland, OR · On-site +1
$50/hr
The role We're looking for people with Psychology experience to work as self-employed AI Trainers to help train and evaluate cutting-edge AI models from some of the world's biggest AI labs. If you ...
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Portland, OR · On-site +1
$50/hr
The role We're looking for people with Psychology experience to work as self-employed AI Trainers to help train and evaluate cutting-edge AI models from some of the world's biggest AI labs. If you ...
| Aspect | Model Train | Model Railroader |
|---|---|---|
| Credentials | Hobbyist knowledge, sometimes certifications for advanced techniques | Hobbyist or professional skills, certifications less common |
| Work Environment | Home workshops, hobby clubs | Home, clubs, or small-scale manufacturing |
| Industry Usage | Primarily hobby and recreation | Hobby, small-scale manufacturing, or restoration |
Model Train refers to the miniature trains used in hobbies, while Model Railroader is a person who designs, builds, and maintains model train layouts. Both share similar skills and environments but differ in scope—Model Trains are the models themselves, whereas Model Railroader is the hobbyist or professional involved in creating and operating these models.

Full-time
Posted 14 days ago
About Us
We are AI researchers and builders who understand how to curate data and RL environments that truly improve models. We curated OpenThoughts, one of the best open reasoning datasets, and have trained SOTA models such as Bespoke-MiniCheck and Bespoke-MiniChart.
We are embarked on a journey to build Environments that are entire digital worlds that can be used to push the frontier of agents.
What You'll Be Working On
You will work directly with our research team on RL environment and task creation for agent training. This means designing observation spaces, action spaces, reward signals, and success criteria for new environments — and building the infrastructure that makes world-scale RL training possible. This is a high-ownership role; you will be building novel systems, not maintaining legacy ones.
Must-Have Skills
3+ years of ML engineering experience — model training, fine-tuning, or post-training pipelines in research or production
Strong Python and deep learning proficiency (PyTorch preferred; familiar with training loops, optimizers, mixed precision)
Hands-on experience with LLM post-training — SFT, RLHF, PPO, DPO, or reward model training — and understanding of how training data quality affects model behavior
Familiarity with RL frameworks (Gymnasium, dm_env) and the ability to design or modify reward functions for agent training objectives
Experience running experiments at scale on cloud or HPC (AWS, GCP, SLURM, or Ray)
Solid understanding of evaluation methodology — held-out sets, benchmark design, avoiding train/eval contamination