> Markdown version of [/jobs/ext/3868303-research-scientist-environments-data-and-post-training](https://www.wearedevelopers.com/jobs/ext/3868303-research-scientist-environments-data-and-post-training). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Research Scientist - Environments, Data and Post-Training

- **Company:** Mercor, Inc.
- **Location:** San Francisco, CA, United States
- **Salary:** $10,000.0 - $15,000.0
- **Contract:** Permanent contract
- **Skills:** Training Data, Application Programming Interfaces (APIs), Artificial Intelligence, Cloud Computing, Computer Programming, Databases, Machine Learning, Open Source Technology, Reinforcement Learning, Model Validation, Backend, Machine Learning Operations, Data Generation
- **Published:** October 22, 2026
- **Apply:** https://www.careerbuilder.com/job-details/research-scientist-environments-data-and-post-training-san-francisco-ca--ab580c63-eae7-4b55-bde2-5589d15be5e1

## About the Role

* Demonstrated experience training and evaluating machine learning models.
 * A strong research record in post-training, reinforcement learning, language-model evaluation, data-centric ML, or a closely related field.
 * Ability to reason rigorously about model behavior, experimental results, and data quality.
 * Strong programming skills and experience implementing machine learning systems.
 * Knowledge of the current AI research landscape and important open problems.
 * Excitement to work in person in San Francisco, five days a week (with optional remote Saturdays), and thrive in a high-intensity, high-ownership environment.

Nice To Have

 * Experience on an industry post-training or frontier-model team.
 * Main authorship of publications at top-tier conferences (NeurIPS, ICML, ACL).
 * Experience with synthetic-data generation
 * Experience building large-scale evaluation or data-generation infrastructure.
 * Solid foundations in distributed or backend systems, and experimental design.
 * Familiarity with APIs, databases, and cloud infrastructure.

## Description

As a Research Scientist at Mercor, you will work at the intersection of research and engineering on frontier post-training. You will develop new training and evaluation methods, test them through rigorous experiments, and implement successful approaches at scale.

Working with researchers, engineers, domain experts, and customers, you will investigate how data, rewards, environments, and optimization methods shape model behavior. Your work will influence frontier models, Mercor's products, and the broader research community through releasing blogposts, technical reports, and papers.

What You'll Do

 * Implement novel post-training methods that improve model reasoning, tool use, and agentic behavior.
 * Develop new training recipes for frontier open models.
 * Design and run experiments across datasets, reward functions, environments, and optimization strategies, including methods such as GRPO and DAPO.
 * Build reinforcement learning with verifiable rewards (RLVR) and other post-training pipelines at scale.
 * Investigate model capabilities and failure modes, then develop targeted training interventions.
 * Create methods for measuring data quality, usability, and causal impact on model performance.
 * Build scalable pipelines for data generation, filtering, augmentation, and selection.
 * Develop rubrics, evaluators, benchmarks, and scoring systems that inform training decisions.
 * Translate open-ended research questions into rigorous experiments and production systems.
 * Collaborate with researchers, applied AI teams, engineers, and domain experts producing training data.
 * Contribute to open-source post-training tools and research.