character.ai
AI platform for conversational characters
Character.AI builds a platform where users create and interact with customizable AI characters for entertainment, storytelling, and connection. It serves millions of monthly users seeking immersive, personalized conversations powered by advanced language models. The service enables endless creativity and exploration through AI-driven interactions.
Principal Research Engineer, Post-Training
Lead technical vision and execution for post-training systems that transform foundation models into intelligent, engaging products. Drive alignment algorithms, RL, and infrastructure for large-scale LLM training and serving.
Technical Program Manager, Model Alignment and Deployment
As a Technical Program Manager, you will be the operational and programmatic backbone connecting cross-functional teams responsible for transforming pretrained language models into intelligent, engaging, safely aligned, and highly scalable products. You will drive clarity, structure, and execution across technically complex and high-stakes work.
Staff Data Scientist, Monetization
Staff Data Scientist partners with product and engineering to optimize monetization via subscriptions, ads, and virtual currencies. Leads experimentation, defines metrics, and delivers insights from behavioral data for revenue growth. Requires 7+ years in consumer products.
Technical Program Manager, AI Infrastructure
Leads high-impact AI infrastructure programs for model training, evaluation, and serving at scale. Partners with engineering, research, and product teams to align roadmaps, drive execution, track metrics, and optimize workflows in technically complex environments. Requires 5-8 years experience in technical program management.
Product Marketing Manager
Leads go-to-market for product launches, owns ASO across iOS/Android, and crafts in-product conversion copy for monetization. Requires 5-8+ years in product marketing at high-growth consumer tech firms with strong copywriting and analytical skills.
Research Engineer, Multimodal
Research Engineer advancing video/image generation models for AI characters, leading fine-tuning, novel architectures, data pipelines, and optimizations using PyTorch and multimodal techniques. Requires expertise in generation models and distributed training.
Product Manager, Activation & Growth
Owns activation, onboarding, growth loops, retention, and monetization for Character.AI's conversational AI platform. Drives metrics through A/B experiments, data analysis, and cross-functional collaboration; requires 5+ years consumer PM experience with proven growth impact.
Product Manager, Core Product
Owns core user experiences like conversations, characters, and creation tools at Character.AI, translating AI model capabilities into engaging consumer products. Requires 5+ years consumer PM experience, strong design sense, and ability to innovate in ambiguity with research and engineering teams.
Software Engineer, Backend/Applied ML (Safety & Integrity)
Designs and builds scalable backend systems and applies machine learning to address safety, integrity, and Generative AI risks. Requires 8+ years backend experience, ML expertise, and distributed systems knowledge.
Software Engineer, Applied ML (Discovery, Recommendation & Search)
Builds and optimizes ML backend systems for recommendation, ranking, and search in a fast-growing AI consumer app. Requires 5+ years experience, CS bachelor's, ML frameworks like PyTorch/TensorFlow, cloud infra, and modern typed languages.
Software Engineer, Backend
Builds and maintains scalable backend systems and APIs, collaborating with cross-functional teams to deliver high-performance solutions aligned with business needs. Requires 5+ years experience with Python/Go, databases, cloud platforms, and containerization.
Software Engineer, Monetization
Builds and optimizes user-facing monetization features like payments, subscriptions, and in-app purchases across mobile and web. Requires strong frontend expertise in TypeScript/React/React Native and backend comfort with Python/Golang, plus experience driving revenue through consumer products.
Software Engineer, Core Product
Builds performant, visually appealing front-end interfaces and design systems for AI interaction products. Requires strong React/TypeScript expertise, focus on UX/craft, and collaboration with design/product teams in a fast-paced environment.
Research Engineer, AI Safety & Alignment
Develops evaluation methods, alignment techniques, and adversarial testing for large language models to ensure safety and alignment with human values. Requires PhD in ML/CS, production code skills, GPU experience, and transformers/RL expertise.
Machine Learning Infrastructure Engineer
Designs, builds, and maintains ML training and serving infrastructure, providing support to research teams. Requires 4+ years in ML infrastructure, cloud platforms like Kubernetes and Google Cloud, and GPU experience.
Research Engineer, Post-Training (All Industry Levels)
Develops alignment algorithms, data pipelines, and sampling methods to optimize post-training AI models for performance and efficiency. Requires PhD or equivalent, ML expertise including reinforcement learning and transformers, and production code experience.