AI Fullstack Engineer (Next.js & LLM)

At Blazity, we are a team of React.js and Next.js experts building modern, API-first digital products. We partner with enterprise clients as trusted technology advisors, delivering solutions that span complex web platforms and e-commerce ecosystems.

Recently, we’ve been expanding our AI capabilities—autonomous agents, AI-driven automation, and LLM-powered workflows—helping companies unlock operational efficiency and innovate at scale.

Must-have Technical Excellence:

• 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: 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.

Soft Skills & Communication:

• 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.

Nice to have:

• 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 must be performed 100% remotely from Poland.