LLM Post-training Engineer Intern (Research & Product) - 2027 Summer

TikTok
San Jose
InternshipFunction: Education & TrainingEducation: bachelorsSkills: ["Learning quickly","Fast-paced execution","Collaboration","Data analysis"]

Join TikTok’s Multimedia AI team to help develop and optimize LLM post-training strategies, including instruction tuning and preference tuning methods. You’ll build evaluation pipelines for model performance, helpfulness, and safety across multimedia product use cases. The role involves reward modeling and human preference learning research, collaborating with engineering to transition experimental work to production-ready AI for video understanding, translation, and content classification.

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FursaFursa
TikTok
TikTok
4 hours ago

LLM Post-training Engineer Intern (Research & Product) - 2027 Summer

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Last checked: 4 hours agoStatus: Live

Job Summary

Join TikTok’s Multimedia AI team to help develop and optimize LLM post-training strategies, including instruction tuning and preference tuning methods. You’ll build evaluation pipelines for model performance, helpfulness, and safety across multimedia product use cases. The role involves reward modeling and human preference learning research, collaborating with engineering to transition experimental work to production-ready AI for video understanding, translation, and content classification.
Location: San Jose
Employment Type: Internship
Job Function: Education & Training
Seniority: Intern level

Key Responsibilities

  • •Support the development and optimization of post-training strategies, including instruction tuning and preference tuning (SFT/DPO/PPO).
  • •Build robust evaluation pipelines to measure model performance, helpfulness, and safety across multimedia product use cases.
  • •Participate in research and implementation of reward modeling and human preference learning methodologies.
  • •Collaborate with engineering teams to bridge research and production-ready AI applications such as video understanding, translation, and content classification.
  • •Analyze and process large-scale datasets to improve model behavior and alignment quality.

Pay and Benefits

Perks:Learning BudgetPaid Leave

Key Requirements

  • •Currently pursuing an Undergraduate or Master’s degree in Computer Science, Machine Learning, or a related technical discipline.
  • •Strong programming skills in Python and experience with deep learning frameworks such as PyTorch or JAX.
  • •Foundational understanding of Transformer architectures and LLM training principles.
  • •Demonstrated ability to learn quickly in a fast-paced environment and a strong passion for AI product application.
  • •Preferred: experience or research projects involving LLM fine-tuning, RLHF, or synthetic data generation.
Experience:AIMultimodal AILLMOpen sourceResearch
Education:Bachelor's in Computer Science, Machine Learning, or related technical discipline
Skills:Learning quicklyFast-paced executionCollaborationData analysis
Tech Stack:PythonPyTorchJAXTransformersDeepSpeedMegatron-LMSFTDPOPPO

Company Brief

TikTok
Short-form video platform that lets users create, share, and discover entertainment content through algorithmic recommendations. It also offers advertising and creator tools for brands, influencers, and businesses.
Industry: Digital Media
Company Size: Enterprise (1,001+ employees)
Growth: Scaleup
Headquarters: Singapore, Singapore
Founded: 2016
WebsiteLinkedIn