Company profile

Character.AI Tech Stack

Consumer AI character chat platform with in-house LLM training and serving

Software Development Redwood City, CA 51–200 employees Founded 2021 Privately Held

Character.AI runs a consumer platform where users chat with and build AI characters, backed by its own model training stack: PyTorch, JAX, DeepSpeed, vLLM, Triton and FlashAttention on Kubernetes and GCP. Hiring is senior-heavy and engineering- and research-led, centered on GPU efficiency, cluster reliability and AI safety, while payment and virtual currency work points to an active monetization push.

Tech Stack 38 technologies

Core StackKubernetes Docker PyTorch TensorFlow TypeScript React React Native Tailwind CSS Python Go Java PostgreSQL MySQL GraphQL AWS Kafka RabbitMQ Apache Spark GCP JAX Azure Mistral Qwen Gemini DeepSpeed Triton CUDA vLLM FlashAttention Apache Beam+8 more

What Character.AI Is BuildingChallenges and projects from their job posts

◆Challenges

Maximizing GPU allocation
Scaling AI backend systems under high load
Supporting large language model training
Ensuring AI model safety and mitigating risks
Scalable payments and monetization experimentation
Improving tooling for engineering velocity

▲Active Projects

Model serving infrastructure
Training pipelines
Tooling to diagnose cluster issues
Safety evaluation and adversarial vulnerability testing
Virtual currency system
Model alignment technique research

Hiring Activity

Minimal15 roles · 0 in 30d

Department

Engineering

Research

Product

Data

Seniority

Senior

Mid

Principal

Staff

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About Character.AI

Character.AI is a privately held company founded in 2021 and headquartered in Redwood City, California. It operates a consumer conversational AI product where people hold open-ended chats with AI characters and create their own chatbots, supported by a creator community. The company employs 51–200 people and hires in the United States. Its teams span engineering, research, product and data, building web and mobile apps with TypeScript, React and React Native alongside large-scale model training and inference infrastructure.

HeadquartersRedwood City, CA

Company Size51–200 employees

Founded2021

Hiring MarketsUnited States

Frequently Asked Questions

What tech stack does Character.AI use?

Character.AI uses PyTorch, JAX, TensorFlow, DeepSpeed, vLLM, Triton, CUDA and FlashAttention for models, Kubernetes and GCP for infrastructure, and TypeScript, React and React Native for apps.

Is Character.AI hiring engineers?

Yes. Engineering is its largest hiring area, followed by research, with mostly senior-level roles in the United States focused on GPU allocation, training pipelines and model serving.

Where is Character.AI headquartered?

Character.AI is headquartered in Redwood City, California. Founded in 2021, it has 51–200 employees.

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How this profile is built

Character.AI's technology stack, projects, and hiring signals are inferred from public hiring and company data — career pages, public listings, and company web presence — then clustered and de-duplicated. Figures are estimates that refresh over time. Read our full methodology →

This is not an official vendor or customer list. It is a technology-adoption signal inferred from public data, intended for B2B research.