About PubNubPubNub powers the world’s most engaging real-time experiences—chat, live updates, and interactive applications—for over 2,000 companies including Verizon, Autodesk, Zillow, and Dropbox. Our global data network processes trillions of messages each month with sub-100 ms latency across 15+ data centers. Backed by $130M in funding, we’re shaping the future of how the world connects.We’re now building something new: an intelligence layer that lets developers weave large language models (LLMs) and deep-learning pipelines directly into high-speed streams. We believe AI should be as real-time as the data it reasons about, and we’re hiring founding engineers to make that vision real.About the RoleWe are looking for a Senior AI Engineer to design and operate AI systems that run in real time and at high scale. You will join a focused AI team responsible for building production-grade AI features and shared infrastructure that enables other engineering teams to deploy AI safely and efficiently. This role is remote-first within Poland, with the option to work from our Katowice office if you prefer.Responsibilities Design, build, and maintain AI-powered services integrated into PubNub’s platformArchitect low-latency ML and LLM pipelines processing millions of messages per minuteBuild internal frameworks, APIs, and tooling for AI feature adoptionTrain, fine-tune, and operate models in productionDevelop and maintain infrastructure for running LLMs at scaleExtend existing backend and client systems to support AI featuresCollaborate with product and engineering teams on system design and trade-offsImprove developer experience through clean APIs, SDKs, and documentationAbout youMust Have5+ years of software engineering experience1+ year of hands-on experience with AI/ML systems in productionExperience shipping customer-facing AI featuresExperience deploying and scaling LLMs in productionExperience working with high-throughput systems (millions of messages/minute)Strong knowledge of TypeScript, Python, or RustSolid system design and backend development skillsRegular use of AI-assisted development tools (Copilot, Cursor, Claude, etc.)Fluent EnglishNice to HaveReal-time or streaming systems (Kafka, Kinesis, WebSockets)Developer platforms, SDKs, or internal toolingCloud AI platforms (AWS Bedrock, Azure OpenAI, Vertex AI)Docker, Kubernetes, infrastructure as codeModel serving frameworks (TorchServe, MLflow, TensorRT)Vector databases and embedding-based systemsWhy Join PubNubBuild a greenfield intelligence platform at internet scaleShip features that land directly in customer-facing products across healthcare, fintech, gaming, and streamingAbout the RoleHigh ownership and influence over technical decisionsRemote-first setup within PolandCompetitive B2B compensation ranging between PLN26,000 - PLN32,000 per monthOptional office in central KatowiceIf you’re excited to make AI real-time, we’d love to hear from you.