Research Engineer, Post-Training (All Industry Levels)

Character.ai
United States
Workplace: OnsiteFull timeUSD 225,000 - 400,000 annuallyFunction: Education & TrainingEducation: phdSkills: ["Communication"]

Research Engineer on the Post-Training team focusing on fine-tuning AI models, improving alignment, data processing, and training methods to enhance performance and efficiency across large language models used by millions of users daily.

Loading

Loading job details...

Preparing the role view and application actions.

FursaFursa
Character.ai
Character.ai
2 years ago

Research Engineer, Post-Training (All Industry Levels)

✓ Verified Job

Canonical indexed version, validated from employer's careers page.

Source: Company careers pageValidated by: Fursa AI
Last checked: 1 hour agoStatus: Live

Job Summary

Research Engineer on the Post-Training team focusing on fine-tuning AI models, improving alignment, data processing, and training methods to enhance performance and efficiency across large language models used by millions of users daily.
Location: United States
Workplace: Onsite
Employment Type: Full time
Job Function: Education & Training

Key Responsibilities

  • •Develop alignment algorithms and loss functions to improve data sample efficiency.
  • •Write data pipelines to process diverse web data into a format models can ingest.
  • •Identify quality signals to understand our model’s performance in the real world.
  • •Design sampling algorithms to improve serving efficiency of large generative models.

Pay and Benefits

Salary: USD 225,000 - 400,000 annually

Key Requirements

  • •All Industry Levels: have at least PhD (or equivalent).
  • •Write clear and clean production-facing and training code.
  • •Experience working with GPUs (training, serving, debugging).
  • •Experience with data pipelines and data infrastructure.
  • •Strong understanding of modern machine learning techniques (reinforcement learning, transformers, etc).
Education:PhD / Doctorate
Skills:Communication
Languages:English
Tech Stack:GPUsTransformersReinforcement learningData pipelinesKubernetesDockerCloud

Company Brief

Character.ai
Builds a conversational AI platform where users create and interact with lifelike AI characters for entertainment, learning, and productivity, backed by advanced large‑language‑model research and consumer-facing products.
Industry: AI & Machine Learning
Company Size: Medium (51 to 250 employees)
Growth: Scaleup
Valuation: Unicorn (USD 1B+)
Funding: Series A
Headquarters: Menlo Park, United States
Founded: 2021
Glassdoor
Glassdoor: 3.6
WebsiteLinkedInGlassdoor