Senior AI Fullstack Engineer (Next.js & LLM)

Your responsibilities, Ship Production Apps: Build scalable web applications using Next.js (App Router) and TypeScript, ensuring high performance and clean architecture., Engineer AI Workflows: Develop and orchestrate LLM-powered features using Anthropic and OpenAI APIs, focusing on tool use and streaming., Agentic Orchestration: Design autonomous agent loops and multi-turn workflows, knowing when to use a structured pipeline versus a dynamic agent., Optimize & Evaluate: Manage token economics (pricing, context windows) and implement prompt evaluations (LLM-as-judge, rule-based) to ensure system reliability., Collaborate: Work directly with senior engineers, founders, and client teams to shape AI capabilities from concept to production. What we offer, B2B: 120 – 180 PLN/h + VAT 🔥, 100% remote (Poland), 29 paid vacation days, Private healthcare + sports card, High-impact work on real AI systems