At Blazity, we are a team of AI engineering experts, building AI agents and agentic workflows on the Vercel AI Cloud. We partner with enterprise clients as trusted technology advisors, delivering solutions that span complex AI systems and eCommerce platforms.
We are looking for an AI Fullstack Engineer passionate about the intersection of modern web architecture and generative AI.
4+ years shipping production web apps using Next.js (App Router), TypeScript, and React.
Solid RSC mental model: Deep understanding of server vs. client boundaries, streaming, and caching (cache, revalidate, tags, Server Actions).
Proven AI Experience: You have shipped LLM-powered features to real users and worked directly with Anthropic or OpenAI APIs (messages, tool use, streaming).
Prompt Engineering: Practical experience with XML tags, structured output, and few-shot prompting.
Token Economics: Understanding of input vs. output pricing, context window management, and prompt caching.
Agentic Loops: Comfortable with tool calls, stop_reason, and multi-turn orchestration.
AI Security & Evals: Knowledge of LLM failure modes and hands-on experience writing prompt evals.
Professional Workflow: Proficient at Claude Code, Git, CI, and code reviews.
Communication: Ability to express thoughts clearly and practice active listening.
Collaboration: Effective team player, capable of working across different perspectives and technical backgrounds.
Adaptability: Thriving in fast-changing environments and managing uncertainty with a proactive mindset.
Critical Thinking: Ability to evaluate complex information objectively to make better technical and product decisions.
Ownership: Taking full responsibility for outcomes rather than just "closing tickets."
Language: English at a C1 level (both written and spoken) for seamless collaboration with international clients.
Experience with Agent SDK or Model Context Protocol (MCP).
Exposure to Vercel AI SDK or LangGraph.
Building production-grade RAG systems.
Familiarity with Claude extended thinking, prompt caching, and Batch APIs.
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.
Work Style: 100% remote work from Poland.
Vacation: 29 paid vacation days.
Health & Sport: Private medical insurance (fully covered) and a fully paid sports card.
Environment: High-impact, hands-on role delivering cutting-edge AI solutions for enterprise-grade clients.