Middle Full Stack Developer (Node.js/React)

About the team: We are a passionate and ambitious team of 120+ people building pdfFiller, an online platform for creating, editing, and signing PDF documents. pdfFiller empowers over 10 million users every month to create and edit PDFs, send them for signing, and securely store documents within a single application. Offering unlimited storage, unlimited templates, and cross-platform integration, pdfFiller is the only PDF editor needed to get your document done. And now, we are looking for a Full Stack Developer who is prepared to contribute to the next chapter of our company's growth. The team builds an AI assistant that understands users' documents and acts on them, an MCP server that exposes pdfFiller's capabilities to external AI clients, and AI-powered improvements to existing product features. Our engineers propose improvements rather than just execute tickets, and our roadmap is planned a year ahead but stays flexible. You'll also get an educational budget, regular knowledge-sharing sessions, and a clear growth path. As Full Stack Developer, you will build tool-calling, streaming, and RAG features that real users rely on, owning them from problem definition to production metrics, with a focus that is about 80% backend and 20% frontend.