Senior AI Engineer
About PubNub
PubNub 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 Role
We 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 platform
Architect low-latency ML and LLM pipelines processing millions of messages per minute
Build internal frameworks, APIs, and tooling for AI feature adoption
Train, fine-tune, and operate models in production
Develop and maintain infrastructure for running LLMs at scale
Extend existing backend and client systems to support AI features
Collaborate with product and engineering teams on system design and trade-offs
Improve developer experience through clean APIs, SDKs, and documentation
About you
Must Have
5+ years of software engineering experience
1+ year of hands-on experience with AI/ML systems in production
Experience shipping customer-facing AI features
Experience deploying and scaling LLMs in production
Experience working with high-throughput systems (millions of messages/minute)
Strong knowledge of TypeScript, Python, or Rust
Solid system design and backend development skills
Regular use of AI-assisted development tools (Copilot, Cursor, Claude, etc.)
Fluent English
Nice to Have
Real-time or streaming systems (Kafka, Kinesis, WebSockets)
Developer platforms, SDKs, or internal tooling
Cloud AI platforms (AWS Bedrock, Azure OpenAI, Vertex AI)
Docker, Kubernetes, infrastructure as code
Model serving frameworks (TorchServe, MLflow, TensorRT)
Vector databases and embedding-based systems
Why Join PubNub
Build a greenfield intelligence platform at internet scale
Ship features that land directly in customer-facing products across healthcare, fintech, gaming, and streamingAbout the Role
High ownership and influence over technical decisions
Remote-first setup within Poland
Competitive B2B compensation ranging between PLN26,000 - PLN32,000 per month
Open paid time off
Stock options
Optional office in central Katowice
If you’re excited to make AI real-time, we’d love to hear from you.

PubNub
PubNub is a dynamic technology company that creates innovative solutions for modern business. We specialize in software development, mobile applications, and data management systems.
Senior AI Engineer
Senior AI Engineer