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Character.AI

15 open roles indexed with location, benefit, and apply-link signals where available.

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  • Technical Program Manager, Model Alignment and Deployment

    Redwood City, CA, Redwood City, California, United States

    unspecified Salary not disclosed

    Technical Program Manager, Model Alignment and Deployment Redwood City, CA, Redwood City, California, United States About the role Model Alignment and Deployment is a critical, cross-functional effort spanning our Post-Training, Safety Engineering, Trust & Safety, ML Infra/Model Serving, and User Experience Research (UXR) teams. Together, these groups are responsible for transforming powerful pretrained language models into intelligent, engaging, safely aligned, and highly scalable products-working across data, compute, algorithms, infrastructure, and user insights to improve model performance and ensure reliable delivery. As a Technical Program Manager, you will be the operational and programmatic backbone connecting these teams: driving clarity, structure, and execution across some of the most technically complex and high-stakes work at Character.AI . This is a role for someone who thrives at the intersection of research, safety, user experience, and production. You'll partner closely with research engineers, safety experts, data scientists, infrastructure engineers, and UX researchers to turn ambitious model development goals into well-scoped, well-tracked, cross-functional programs. You will ensure that the data pipelines, evaluation frameworks, alignment workflows, and serving infrastructure underpinning our models are moving fast and moving well. You'll operate effectively in high-ambiguity environments, anticipate risks before they become blockers, and bring the kind of technical fluency needed to earn trust with researchers while communicating clearly to leadership. What you'll do - Program ownership: Lead planning and execution of cross-functional programs spanning data collection, annotation pipelines, alignment workflows (RLHF, DPO, Constitutional AI), safety guardrails (adversarial testing, red-teaming), and model serving. Establish scopes, goals, timelines, risks, and success

  • Staff Data Scientist, Monetization

    Redwood City, CA, Redwood City, California, United States, New York, NY

    unspecified Salary not disclosed

    Staff Data Scientist, Monetization Redwood City, CA, Redwood City, California, United States, New York, NY About the Role: Character.AI is building the future of open-ended interactions between people and intelligent agents. As our platform scales, so does the opportunity to build sustainable, user-aligned monetization through subscriptions, advertising, and virtual currency economies. We are seeking a Staff Data Scientist to partner closely with product, engineering, and growth teams to scale and optimize Character.AI 's monetization systems. This role focuses on enabling teams to design, launch, and iterate on data-informed, user-centric monetization experiences, while shaping how we measure, experiment with, and grow revenue without compromising the creativity and openness that define Character.AI . What you'll do: You will partner closely with product and engineering teams to drive data-informed monetization across subscriptions, advertising, and virtual currency economies. This role defines success metrics, leads experimentation, and translates complex behavioral and economic data into actionable insights, while building the data science foundations needed to support rapid product iteration and long-term growth. Qualifications: - 7+ years of experience as a Data Scientist working on consumer-facing products, ideally in chat, social, UGC, or entertainment platforms - Strong intuition for identifying the right questions and quickly driving to high-impact insights - Proven ability to turn analysis into product decisions and shipped outcomes - Comfortable working in fast-moving, experimental environments with incomplete data - Experience building or scaling data science practices, including experimentation, metrics, and analytics tooling You will be a good fit if you have: - Direct experience

  • Technical Program Manager, AI Infrastructure

    Redwood City, CA, Redwood City, California, United States

    unspecified Salary not disclosed

    Technical Program Manager, AI Infrastructure Redwood City, CA, Redwood City, California, United States About the Role We're hiring a Technical Program Manager, AI Infrastructure to lead high-impact programs that power Character.AI 's model development and serving systems at scale. In this role, you'll partner closely with engineering, research, and product teams to shape infrastructure strategy, align roadmaps, and drive end-to-end execution for critical initiatives across training, evaluation, and inference. You'll help ensure our systems are reliable, efficient, and capable of supporting rapid iteration as we scale AI experiences to millions of users. This role is a good match for someone who thrives in technically complex environments, enjoys bringing structure to ambiguous problem spaces, and can drive alignment across deeply cross-functional teams. You'll often operate at the intersection of research and production, helping teams navigate tradeoffs between speed, quality, and reliability. You should be comfortable influencing without authority, anticipating risks early, and keeping large, interdependent efforts moving forward. What You'll Do - Lead planning and execution of major AI infrastructure initiatives spanning training pipelines, data systems, model evaluation, and inference/serving - Build structures that keep teams aligned: scopes, goals, requirements, timelines, risks, and success metrics - Partner with engineering, research, and product to translate model and product needs into infrastructure roadmaps and priorities - Drive cross-functional accountability and communication across teams working on tightly coupled systems - Track key infrastructure metrics (e.g., reliability, latency, throughput, cost efficiency) and define reporting that surfaces progress and risk - Identify bottlenecks in infrastructure workflows

  • Product Marketing Manager

    Redwood City, CA, Redwood City, California, United States

    unspecified Salary not disclosed

    Product Marketing Manager Redwood City, CA, Redwood City, California, United States About the Role At Character.AI , our mission is to build the future of AI entertainment, giving everyone access to personalized, engaging AI experiences. To bring that mission to the world, we need a product marketing leader who can own how we launch, how we message, and how we show up-in app stores, inside our product, and across every surface users encounter. As PMM, you will lead go-to-market for product launches, own ASO performance across iOS and Android, and write the in-product copy that drives conversion across our monetization surfaces. You'll partner with Monetization PMs (who own revenue strategy, pricing, and channel P&Ls) to translate their decisions into compelling user-facing messaging. This is Character's first dedicated PMM hire. You'll report to the Head of Growth Marketing and sit at the center of Product, Growth, and Creative-defining the function from the ground up. Responsibilities Go-to-Market Strategy - Lead GTM end-to-end for product launches: positioning, messaging, launch plans, cross-functional timelines, and branded campaigns - Own the c.ai + subscription promo calendar: plan and execute deals, discounts, and trial offers timed to brand moments, cultural moments, and product launches - Conceive and execute branded campaigns that build awareness, drive trial, and reinforce Character's brand with consumers - Build and maintain the positioning framework: product positioning, competitive messaging, and value propositions that evolve with the product and market - Monitor the competitive landscape: track competitor positioning, pricing, and marketing to inform messaging and

  • Research Engineer, Multimodal

    Redwood City, CA, Redwood City, California, United States

    unspecified Salary not disclosed

    Research Engineer, Multimodal Redwood City, CA, Redwood City, California, United States About the Role and Team Joining us as a Research Engineer on the Multimodal team, you'll be at the forefront of building and advancing video and image generation models that bring AI characters to life in entirely new ways. Your work will directly shape how millions of users experience rich, expressive, and visually compelling AI interactions every day. The Multimodal team is responsible for training, fine-tuning, and deploying cutting-edge image, audio and video generation models that power Character.AI 's visual experiences. We work across the full model lifecycle - from data pipelines and training to deployment and product integration. As a Multimodal Research Engineer, you will own and advance our video model training efforts, including joint audio-visual generation and image-to-video. You will collaborate across research, product, and infrastructure to push the boundaries of what AI-generated visuals can look and feel like at scale. What You'll Do - Lead fine-tuning and continued training of video generation models, including image-to-video and joint audio-visual generation. - Design and experiment with novel model architectures for multimodal generation, including multimodal conditioning (voice, structured text, reference images). - Leverage techniques such as LoRA, RLHF, and full-parameter fine-tuning to improve model quality across diverse visual scenarios. - Design and build large-scale data pipelines and automated annotation workflows to support continuous model improvement. - Explore model compression, inference acceleration, and serving optimizations to enable efficient real-time video processing at scale. Who You Are - Strong passion for

  • Product Manager, Activation & Growth

    Redwood City, CA, Redwood City, California, United States

    unspecified Salary not disclosed

    Product Manager, Activation & Growth Redwood City, CA, Redwood City, California, United States Character.AI is building what comes after television, after gaming, after social media. We're creating a new medium-one where anyone can bring a character to life and share it with millions. Our platform is already one of the largest consumer AI products on Earth. Millions of people use Character every day to talk, play, learn, and create. Now we're building the tools and formats that will define what entertainment looks like for the next decade. The company has rapidly scaled to tens of millions of monthly active users, achieved unicorn status within roughly two years of launch, and has been recognized as Google Play's AI App of the Year, underscoring its cultural relevance and product momentum. Product Overview Character.AI 's core product is an immersive conversational platform where users interact with customizable AI characters across mobile and web. Key product pillars include: - AI Characters & Conversations: Deep, open-ended conversational experiences designed for long-form engagement. - Creative Tools: User-generated characters and worlds that encourage creation, remixing, and sharing. - Entertainment-Led UX: A focus on delight, emotional resonance, and repeat engagement rather than task completion. From a growth perspective, the product behaves like a hybrid of social, gaming, and subscription entertainment platforms, with strong network effects to delight and engage users. Role Overview: Product Manager, Activation & Growth This role owns the critical transition from first interaction to long-term engaged user. It sits at the center of product, data,

  • Product Manager, Core Product

    Redwood City, CA, Redwood City, California, United States

    unspecified Salary not disclosed

    Product Manager, Core Product Redwood City, CA, Redwood City, California, United States Character.AI is building what comes after television, after gaming, after social media. We're creating a new medium-one where anyone can bring a character to life and share it with millions. Our platform is already one of the largest consumer AI products on Earth. Millions of people use Character every day to talk, play, learn, and create. Now we're building the tools and formats that will define what entertainment looks like for the next decade. The company has scaled rapidly to tens of millions of monthly active users, reached unicorn status within roughly two years, and was named Google Play's AI App of the Year, reflecting both mainstream adoption and strong cultural relevance. Product Overview The Core Product team owns the foundational experiences that define Character.AI 's identity and long-term differentiation: - Conversations: Long-form, emotionally engaging interactions powered by frontier language models. - Characters: Creation, discovery, and interaction with AI characters that feel alive and distinct. - Creative & Creator Tools: Systems that empower users and creators to expand the content ecosystem. The product challenge is not simply making AI work, but translating rapidly evolving model capabilities into polished, intuitive, and magical consumer experiences that keep users engaged for hours at a time. Role Overview: Product Manager, Core Product This role shapes the heart of Character.AI . As a Product Manager on Core Product, you will own the experiences that users spend the most time with-conversations, characters, discovery, and

  • Software Engineer, Backend/Applied ML (Safety & Integrity)

    Redwood City, CA, Redwood City, California, United States

    unspecified Salary not disclosed

    Software Engineer, Backend/Applied ML (Safety & Integrity) Redwood City, CA, Redwood City, California, United States About the role We're looking for a talented and creative Software Engineer to join our Safety Engineering team at Character.AI ! In this role, you will be at the forefront of designing, developing, and scaling robust backend systems and leveraging applied machine learning to tackle critical integrity and safety challenges. You will be architecting and implementing innovative solutions in a key role in addressing the unique safety challenges that come with human-to-AI interaction-bringing your technical expertise to the table as we define industry best practices in this emerging space. This is a high-impact role where you will provide technical leadership, drive innovation, and contribute to the core of our platform's trustworthiness. What you'll do - Architect & Build: Design, develop, and maintain highly scalable, resilient, and performant backend systems that power our integrity and safety features. - Lead Complex Solutions: Lead the technical design and implementation of sophisticated backend solutions for detecting, preventing, and mitigating a wide array of integrity risks. This includes traditional issues (e.g., content classification, spam, etc.) as well as emerging threats related to Generative AI (e.g., misuse of generative models, generation of harmful or biased content, etc). - Apply Machine Learning: Conceptualize, develop, deploy, and iterate on machine learning models and algorithms to address complex integrity challenges. This includes areas like content classification (including AI-generated content), anomaly detection, risk scoring, behavior analysis, and developing safeguards for Generative AI systems (e.g., robust

  • Software Engineer, Applied ML (Discovery, Recommendation & Search)

    Redwood City, CA, Redwood City, California, United States

    unspecified Salary not disclosed

    Software Engineer, Applied ML (Discovery, Recommendation & Search) Redwood City, CA, Redwood City, California, United States About the Role As a Software / ML Engineer you will work cross functionally with product, data science and data platform to identify, design and implement the applied ML models and infra, ranging from the model optimization, data pipeline to model training and serving infrastructure, on one of the fastest growing native AI consumer applications on the market today. You will work on implementation of our ML backend systems to power the discovery surfaces including recommendation, ranking and search, supporting new AI generated content formats on our product while working with the team to support optimizing our existing systems. Requirements: - B.A.S. in Computer Science or equivalent experience. - 5+ years of industry experience - Experience building/consuming RESTful and gRPC based web-services - Experience building and managing infrastructure in a cloud environment (GCP, AWS or Azure) - Familiar with one of the popular ML Frameworks like Pytorch, Tensorflow - Experience writing highly performant service in a modern typed language - Experience configuring and maintaining CI/CD pipelines and automated testing Desired Experience: - Experience with shipping intelligent features, end-to-end, and from idea to production - Experience with understanding, designing or implementing a full pipeline from data ingestion to model training. - Experience with production AI/ML systems and services including optimizing GPU/TPU deployments - Experience working with vector databases or other feature storage You will be a good fit if you are proactive and have a

  • Software Engineer, Backend

    Redwood City, CA, Redwood City, California, United States

    unspecified Salary not disclosed

    Software Engineer, Backend Redwood City, CA, Redwood City, California, United States About the Role We are looking for a talented and motivated Backend Engineer to join our team. You will be responsible for building and maintaining scalable, high-performance backend systems that power our products. Collaborating with designers, data scientists, and engineers, you'll play a key role in conceptualizing, designing, and delivering robust and efficient backend solutions. What you'll do - Design, develop, and maintain scalable backend services that support our applications and infrastructure. - Implement secure and efficient APIs to support frontend applications and third-party integrations. - Optimize system performance, reliability, and scalability through effective architecture and engineering best practices. - Work closely with product managers, data analysts, and frontend engineers to develop backend solutions that align with business and user needs. - Ensure high availability, fault tolerance, and performance of backend systems. - Monitor system health, troubleshoot issues, and implement improvements to enhance efficiency and stability. - Maintain security best practices to protect user data and system integrity. - Stay up to date with industry trends and emerging technologies in backend development and distributed systems. Who you are - 5+ years of experience in backend development, building scalable and reliable applications. - Strong proficiency in programming languages such as Python, Java, or Go. Python and Go are preferred. - Experience with database technologies such as PostgreSQL, MySQL, or NoSQL solutions. - Familiarity with designing and integrating APIs, including REST and GraphQL. - Understanding of distributed systems, microservices architecture, and

  • Software Engineer, Monetization

    Redwood City, CA, Redwood City, California, United States

    unspecified Salary not disclosed

    Software Engineer, Monetization Redwood City, CA, Redwood City, California, United States About the Role We are scaling personalized AI to billions of users and monetization is at the core of making this vision sustainable. Our monetization team is reimagining how users interact with virtual currency, subscriptions, and premium features in ways that feel intuitive, rewarding, and fun. We're looking for a product engineer who thrives at the intersection of core product, commerce, and user experience-someone excited to design and build systems that not only drive revenue but also enhance user delight. If you have experience with subscriptions, ads, virtual economies, or in-app purchase flows, and care deeply about building high-quality user experiences we'd love to work with you. What you'll do - Build and optimize user-facing features across mobile and web that power payments, subscriptions, and in-app purchase flows. - Design and experiment with monetization surfaces, from virtual currency systems to premium upsells to advertising. - Partner closely with design and product to create delightful, performant, and trustworthy purchase experiences. - Collaborate with data science to define monetization success metrics, run experiments, and analyze outcomes. - Work with backends to design scalable, reliable systems for payments, entitlements, and transactions. - Maintain a high bar for UI/UX polish, performance, and privacy in sensitive user flows. - Help shape the company's approach to monetization experimentation, including frameworks for A/B testing and iteration velocity. Who you are - Experience in consumer products with monetization, IAP, or subscription flows. - Deep understanding of Typescript,

  • Software Engineer, Core Product

    Redwood City, CA, Redwood City, California, United States

    unspecified Salary not disclosed

    Software Engineer, Core Product Redwood City, CA, Redwood City, California, United States About the role and team We are building the future of open-ended interactions between people and intelligent agents. This requires rethinking design, user interfaces, workflows and interactivity from first principles. We're looking for a Core Product engineer who is genuinely excited about this future and can make significant contributions to our front-end development efforts. If you are a skilled software engineer with a deep passion for front end development, design, craft, and you thrive in a fast-paced, agile environment, we encourage you to apply for this exciting opportunity. What you'll do - Develop highly performant, visually appealing, and user-friendly interfaces that push the boundaries of what's possible. - Enhance and refine our user interface, focusing on engaging our users by fulfilling their needs, desires, and expectations. - Collaborate closely with the design team to translate visionary concepts into tangible user experiences and product interfaces. - Establish, evolve, and maintain design foundations, systems, and patterns for the team, setting the bar for product consistency and quality. - Collaborate with others to define and implement new product features and design patterns Who you are - Experience as a Front-End or Full-Stack Software Engineer with a strong focus on user experience and design systems - Deep understanding of Typescript, React, React Native, Tailwind, HTML, and modern front-end best practices. - Demonstrated experience with building features and experiences for consumer products - Passionate about the pixels, an exceptional eye for detail, and

  • Research Engineer, AI Safety & Alignment

    Redwood City, CA, Redwood City, California, United States

    unspecified Salary not disclosed

    Research Engineer, AI Safety & Alignment Redwood City, CA, Redwood City, California, United States About the role and team Joining us as a Research Engineer, you'll be at the forefront of tackling one of the most critical challenges in AI today: safety and alignment. Your work will be pivotal in understanding and mitigating the risks of advanced AI, conducting foundational research to make our models safer, and solving the core technical problems of AI alignment -ensuring our models behave in accordance with human values and intentions. The Safety team is dedicated to pioneering and implementing techniques that make our models more robust, honest, and harmless. As a Research Engineer, you will bridge the gap between theoretical research and practical application, writing high-quality code to test hypotheses and integrating successful safety solutions directly into our products. Your research will not only protect millions of users but also contribute to the broader scientific community's understanding of how to build safe, beneficial AI. What you'll do - Develop and implement novel evaluation methodologies and metrics to assess the safety and alignment of large language models. - Research and develop cutting-edge techniques for model alignment, value learning, and interpretability. - Conduct adversarial testing to proactively uncover potential vulnerabilities and failure modes in our models. - Analyze and mitigate biases, toxicity, and other harmful behaviors in large language models through techniques like reinforcement learning from human feedback (RLHF) and fine-tuning. - Collaborate with engineering and product teams to translate safety research into practical, scalable solutions

  • Machine Learning Infrastructure Engineer

    Redwood City, CA, Redwood City, California, United States

    unspecified Salary not disclosed

    Machine Learning Infrastructure Engineer Redwood City, CA, Redwood City, California, United States About the role We're looking for seasoned ML Infrastructure engineers with experience designing, building and maintaining training and serving infrastructure for ML research. Responsibilities : - Provide infrastructure support to our ML research and product - Build tooling to diagnose cluster issues and hardware failures - Monitor deployments, manage experiments, and generally support our research - Maximize GPU allocation and utilization for both serving and training Requirements: - 4+ years of experience supporting the infrastructure within an ML environment - Experience in developing tools used to diagnose ML infrastructure problems and failures - Experience with cloud platforms (e.g., Compute Engine, Kubernetes, Cloud Storage) - Experience working with GPUs Nice to have - Experience with large GPU clusters and high-performance computing/networking - Experience with supporting large language model training - Experience with ML frameworks like Pytorch/TensorFlow/JAX - Experience with GPU kernel development About Character.AI Character.AI empowers people to connect, learn and tell stories through interactive entertainment. Over 20 million people visit Character.AI every month, using our technology to supercharge their creativity and imagination. Our platform lets users engage with tens of millions of characters, enjoy unlimited conversations, and embark on infinite adventure s. In just two years, we achieved unicorn status and were honored as Google Play's AI App of the Year-a testament to our innovative technology and visionary approach. Join us and be a part of establishing this new entertainment paradigm while shaping the future of Consumer AI!

  • Research Engineer, Post-Training (All Industry Levels)

    Redwood City or New York City, United States

    unspecified Salary not disclosed

    Research Engineer, Post-Training (All Industry Levels) Redwood City or New York City, United States About the role and team Joining us as a Research Engineer on the Post-Training team, you'll be diving into the exciting world of fine-tuning AI models, optimizing their performance, and ensuring they meet the highest standards of quality and efficiency. Your work will directly contribute to our groundbreaking advancements in AI, helping shape an era where technology is not just a tool, but a companion in our daily lives. At Character.AI , your talent, creativity, and expertise will not just be valued-they will be the catalyst for change in an AI-driven future. The Post-Training team is responsible for developing our powerful pretrained language models into intelligent, engaging, and aligned products. As a Post-Training Researcher, you will work across teams and our technical stack to improve our model performance and training methods, including data, compute and algorithms. You will get to shape the conversational experience of millions of users per day. What you'll do - 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. Who you are - "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) -