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About SagaSaga is building the infrastructure and products for the next generation of AI agents. Our AI Character Agent Network allows studios, creators, and publishers to turn their most iconic IP into living, breathing digital companions that engage fans across social media, drive organic user acquisition, and power a new kind of agentic commerce. Our agents run on a proprietary training architecture that combines LLMs and SLMs to produce fine-tuned character AI agents — autonomous enough to develop their own intelligence and personality, while guided by the creative vision of the original studios and creators. We've processed over 23 million transactions worth more than $2 billion since our early 2024 launch, and we're just getting started. Our team is world-class — veteran web3 entrepreneurs and builders from Apple, X (formerly Twitter), Robinhood, Samsung, NVIDIA, Tendermint and Skuchain — and we're looking to grow as we scale our agent platform to more studios, more platforms, and more users. We offer a flexible, remote working environment. You can expect a warm welcome from a friendly and international team that will support you in your personal and professional growth.The RoleAs a Senior AI Agent Engineer, you'll be at the center of how we build, train, deploy, and operate character AI agents at scale. You'll work across the full lifecycle — from fine-tuning models and orchestrating SLM swarms to deploying agents across social platforms and building the infrastructure that keeps them running reliably. This role blends ML engineering, backend development, and systems thinking.The WorkBuild and maintain the training and inference pipelines for character AI agents, including LLM/SLM orchestration and swarm-based architecturesDeploy and operate AI agents across social media platforms (Instagram, X, WhatsApp, TikTok) with consistent character behavior and personality coherenceDevelop tooling for studios and creators to customize agent personality, lore, brand guidelines, and behavioral guardrailsBuild and improve the feedback loops — fine-tuning, reward models, RLHF, and RLAIF — that keep agents improving over timeArchitect and scale the infrastructure supporting agent deployments, including multi-modal capabilities (text, voice, video, livestreaming)Contribute to the agentic commerce platform — enabling agents to drive transactions, recommend products, and interact with payment systemsImplement safety and content moderation systems to ensure agents behave appropriately across diverse user interactionsCollaborate with studio partners to translate creative direction into agent training parameters and behavioral specificationsMonitor agent performance, engagement metrics, and behavioral drift in productionMust Have5+ years of backend or ML engineering experience, with hands-on work deploying AI/ML models to productionExperience with LLM fine-tuning, prompt engineering, and inference optimizationStrong proficiency in Python; experience with Golang is a plusExperience building and operating API services and data pipelines at scaleFamiliarity with reinforcement learning techniques (RLHF, reward modeling) or agent framework developmentUnderstanding of multi-model architectures — orchestrating multiple models or agents to collaborate on tasksExperience deploying applications that integrate with third-party platforms and APIs (social media, messaging, commerce)Strong systems thinking — comfortable reasoning about distributed systems, scaling, and reliabilityExceptional problem-solving and communication skillsNice to HaveExperience with character AI, conversational AI, or NPC behavior systemsBackground in gaming, entertainment, or media technologyExperience with multi-modal AI (voice, image, video generation or processing)Familiarity with blockchain infrastructure, on-chain payments, or crypto-native commerceExperience with MCP (Model Context Protocol) or agent-to-agent communication protocolsUnderstanding of content safety, trust & safety systems, or responsible AI practicesContributions to open-source AI/ML projectsBenefitsWork remotely from anywhere in the worldWork at the intersection of AI, entertainment, and cryptoFlexible working hoursFlexible vacation policyCompetitive salaryStock optionsFull benefits**Medical, Dental, Vision, and 401k retirement plans for US employees only.
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