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Meta Platforms · Menlo Park, CA

# Research Engineer, Pre-training Data - MSL FAIR

Menlo Park, CA Data & Analytics 

Listed on Meta Platforms’s official careers site. Listed as of October 18, 2026. Check that it is still open and apply there.
[Apply on Meta Platforms’s careers site →](https://www.metacareers.com/jobs/1419173033108804/)

[OpenNash Jobs](https://jobs.opennash.com/) / [Meta Platforms](https://jobs.opennash.com/companies/meta-platforms/) / Research Engineer, Pre-training Data - MSL FAIR

## Job description

Meta is seeking AI research engineers to help us build the data foundation for Meta's most advanced Large Language Models. We're looking for engineers with LLM expertise to join us on working with data at scale and to push beyond the data ceiling. Our team contributes to data curation across all stages of LLM development (pre-training, mid-training, post-training) and all domains/modalities (e.g., web, code, agent, multilingual).

We tackle the hardest challenges at trillion-scale, including organic data curation, synthetic data generation, agent and interaction data, and frontier paradigms that redefine what's possible. Based in Meta Superintelligence Labs (MSL) within the Fundamental AI Research Organization (FAIR), you'll directly contribute to Meta’s frontier models like Llama, while having the chance to collaborate with researchers and engineers across MSL.

## Responsibilities
- Collaborate with cross-functional teams to develop Meta’s next foundational models Architect efficient and scalable data curation systems and pipelines Fundamentally improve our data velocity across workflows and projects by contributing to the advancement of data tooling
- Execute on high priority projects in pre-training, mid-training, or post-training data curation
- Apply specialized expertise in agentic data, synthetic data, reasoning data, web parser, coding data, data scaling laws, or datamix optimization
- Lead complex technical projects end-to-end

## Qualifications

Bachelor's degree in Computer Science, Computer Engineering, relevant technical field, or equivalent practical experience 2+ years of industry research experience in LLM/NLP or related AI/ML models Experience as a formal technical lead, leading major technical initiatives with cross-functional impact, and/or influencing strategy across multiple teams Practical experience with pre-training or mid-training data curation for large foundational models and experience working with organic, synthetic, agentic, or reasoning data for LLMs

Demonstrated data infrastructure and software background, and experience building data tooling and services Published research in leading peer-reviewed conferences (e.g., NeurIPS, ICML, ICLR, ACL, EMNLP) and/or demonstrated significant industry influence in the field of AI Experience working on frontier-quality/state-of-the-art Large Language Models Masters degree or PhD in Computer Science or a related technical field

Hands-on experience with modeling frameworks like PyTorch Hands-on experience on SQL and large-scale data handling, with familiarity of frameworks like Spark and Hive

## At a glance
- Posted by the employer: Not stated
- First seen by OpenNash: Jul 11, 2026
- Last checked: Oct 18, 2026
- Listed for: 99 days
- Location: Menlo Park, CA[Apply on Meta Platforms’s careers site →](https://www.metacareers.com/jobs/1419173033108804/)

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