Senior Software Engineer, Backend (AI Agent Runtime)

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About this role

Senior Software Engineer, Backend (AI Agent Runtime) Canada (Remote) Cresta unlocks the true potential of the customer experience, turning every conversation into a competitive advantage. Cresta's unified AI platform combines conversational AI agents, real-time human agent augmentation, and comprehensive conversation intelligence to drive revenue and efficiency gains across every channel. The world's leading companies, including United Airlines, Cox Communications, and Marriott, use Cresta to power world-class customer experiences every day. Born from the Stanford AI Lab, Cresta has raised more than $270 million from the world's leading investors, including a16z, Greylock, and Sequoia. Cresta's leadership includes some of the leading minds in AI today. Our CEO, Ping Wu , founded and led Google's Contact Center AI and Vertex AI platforms before joining Cresta to build the future of AI-driven customer experiences. Over the next few years, AI is going to redefine how people all over the world interact with businesses every day. Come build that future at Cresta. About the role - Build real-time AI agent infrastructure : Design and operate the stateful, low-latency runtime that powers voice and chat AI agents - from LLM streaming and conversation state management to graceful recovery and multi-channel support. - Solve distributed systems problems : Own session management across scaled-out workers - including affinity, checkpointing, crash recovery, and consistency under concurrent access. - Build a function execution platform : Own a serverless-style runtime where customers deploy custom logic - build orchestration, container lifecycle, autoscaling, and versioned rollouts. - Own developer experience and test

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