Senior Backend Engineer (AI/LLM Systems)
PubNubSilesian Voivodeship, Poland
Posted March 9, 2026
312000 - 420000 PLN
Full Time
About the Company
PubNub is a San Francisco–based product company powering real-time experiences including chat, live updates, and interactive applications.
Job Description
PubNub is looking for a Senior Backend Engineer to build and operate AI services at scale, with a focus on low-latency inference pipelines and model routing.
Requirements
- Ship AI-powered features into production
- Integrate LLM inference and build evaluation and observability tooling
- Design low-latency inference pipelines for high-throughput message streams
- Implement model routing, prompt and retrieval patterns (RAG), caching, batching, and fallbacks
- Build internal frameworks, APIs/SDKs, and tooling for other teams to ship AI features safely and consistently
Benefits
- Competitive monthly compensation: 26,000 – 35,000 PLN + VAT
- Flexible time management focused on outcomes
- Access to modern tools and infrastructure
- Optional access to our centrally located Katowice office
- Equity participation opportunity
