Middle Full Stack Developer, Node.js/React

• Build an AI assistant that understands users' documents and acts on them
• Build an MCP server exposing pdfFiller's capabilities to external AI clients
• Develop AI-powered improvements to existing product features
• Build tool-calling, streaming, and RAG features
• Own features end to end, from requirements to production and post-release monitoring
• Own automated quality, including unit and integration tests and LLM evaluation cases
• Review code and documentation
• Participate in duty rotation, monitor production, and respond to incidents
• Propose improvements to processes, tooling, and legacy code
• Work approximately 80% on backend and 20% on frontend using the listed technology stack

• Experience with LangGraph or LangChain, agent orchestration, and state machines
• Experience with RAG and vector search (pgvector)
• Familiarity with SSE or other streaming protocols
• Experience with observability tools such as OpenTelemetry and the Grafana stack
• Experience with LLM evaluation, including eval datasets and LLM-as-judge
• Experience writing technical documentation (C4, ADR)

• Educational budget
• Regular knowledge-sharing sessions
• Clear growth path