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
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
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
