Artificial intelligence
10 Character.AI machine learning engineers
These ten current and former Character.AI machine learning engineers have held ML infrastructure, research engineering and technical staff roles focused on model training and serving there. A reader can learn what machine learning engineering at Character.AI involves from people who have done it.
Professionals to explore
01—10Archit Gupta
LinkedInExperience: Member of Technical Staff · Character.ai
Former Member of Technical Staff at Character.AI (2023–2024); the profile says he was on the early team at Character AI and worked on training and scaling language models. Now Member of Technical Staff at SpaceXAI, and former Staff Research Engineer at Meta (2024–2025) and Research Engineer at Google DeepMind (2018–2022).
Arnav Kartikeya
LinkedInExperience: Research Engineer, Post-Training · Character.ai
Research Engineer, Post-Training at Character.AI since April 2026, in the San Francisco Bay Area, with a headline naming OSS LLM Post-Training. Former Machine Learning Engineer II at Suki (2025–2026) and part-time Machine Learning Engineer at Suki (2024–2025), per the work history on the profile.
Cecilia Chen
LinkedInExperience: Member of Technical Staff · Character.ai
Member of Technical Staff at Character.AI since April 2026, in the San Francisco Bay Area; the role listing describes post-training research and building scalable data pipelines for LLMs. The profile also lists Software Engineer at Google, with the Google role starting in July 2017.
Jack Wang
LinkedInExperience: Technical Staff · Character.ai
Technical Staff at Character.AI since June 2026, with the role listing naming ML Infra and Inference, in the Engineering and Technical department. Former Machine Learning Researcher at MIT-IBM Computing Research Lab (2025–2026) and Researcher at MIT Computer Science and Artificial Intelligence Laboratory (CSAIL) (2025–2026).
Leqi Zou
LinkedInExperience: Research Engineer · Character.ai
Former Research Engineer at Character.AI (2023–2024), in the Research department; the role listing names reinforcement learning. Now Member of Technical Staff at OpenAI since September 2024, and former Software Engineer at ByteDance (2020–2023) and Software Engineer at Google (2016–2020).
Mukund Sudarshan
LinkedInExperience: Member of Technical Staff · Character.ai
Former Member of Technical Staff at Character.AI (2025) in San Francisco; the role listing describes post-training research and reward models for user engagement and memory. Now Member of Technical Staff at Anthropic since December 2025, and former Co-founder and CTO of Quilt Labs Inc (2023–2024).
Siddharth Verma
LinkedInExperience: Research Engineer · Character.ai
Former Research Engineer at Character.AI (2023–2024); the profile says he worked on LLM pretraining there. Now Research Engineer at Google DeepMind since August 2024, and former Senior Machine Learning Engineer at Square (2022–2023) and AI Resident at Facebook (2021–2022).
Wayne Huang
LinkedInExperience: ML Infrastructure Engineer · Character.ai
ML Infrastructure Engineer at Character.AI since March 2026 in San Francisco; the profile describes building infrastructure for LLM training and model inferencing. Former Lead DevOps Engineer at MediaAlpha (2025–2026), Lead Member Of Technical Staff at Salesforce (2022–2025) and DevOps Engineer at Zoom (2021–2022).
Wenting Ye
LinkedInExperience: Research Engineer · Character.ai
Former Research Engineer at Character.AI (2024) in Menlo Park; the role listing names efficient pretraining, distillation and evaluation, including a compute efficiency gain through distillation and GPU optimization. Now Member of Technical Staff at OpenAI, and former Staff Research Engineer at Google DeepMind (2024–2026).
Yuanfan Chen
LinkedInExperience: AI Infra Engineer · Character.ai
AI Infra Engineer at Character.AI since August 2026, in the San Francisco Bay Area, with a headline naming ML Infra at Character.AI, LLM inference research and efficient and scalable serving. Former AI Infra Engineer at Tencent (2025) and Research Assistant at Cornell Tech (2025–2026).
Choose the right perspective
Match the person's focus, such as pretraining, post-training, reward models, ML infrastructure or inference, to your question, and check whether they are still at Character.AI. Where they went next can also help you find someone who has compared Character.AI with other labs.
Questions to take into the conversation
- 01How do machine learning engineers at a consumer AI company like Character.AI make model training and serving cost-efficient?
- 02What goes into post-training a chat model for engagement while keeping its behavior safe?
- 03How should a team design inference infrastructure for very high volumes of conversational traffic?
Reaching Character.AI machine learning engineers
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Pick one of the 10 people on this page and choose "Book a paid call", or describe your project to find others. You offer a fee for a 15-minute call or a written answer, Instant Expert finds the person's work email and sends the invitation, and they decide whether to accept. The list covers 1 company: Character.ai, based on profile data retrieved on October 8, 2026. Being listed here doesn't mean someone has agreed to take calls.
How much does it cost to reach Character.AI machine learning engineers?
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About this directory
This is a professional research starting point based on business profile data retrieved on . Titles and companies reflect that source snapshot and may describe past or present roles. Check the linked profiles for current details. Inclusion does not imply Instant Expert membership or availability.
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