Senior JavaScript Engineer

REMOTE Node.jsReactMongoDBB2 English level fluency We’re looking for a Senior JavaScript Engineer (Node.js + React) with the potential to grow into a Tech Lead role! You will join a long-term project for a Germany-based company focused on digital transformation and business process automation for SMEs. The core product is a document management system used to streamline internal workflows and improve collaboration. Major responsibilities: Maintain and extend an existing application (Node.js + React) Debug and resolve complex issues across frontend and backend Implement new features while working within legacy constraints Improve performance, stability, and security of the system Propose and implement incremental architectural improvements Collaborate with the Product Owner and team to clarify requirements Mentor junior developers and contribute to team growth. We'd love to hear from you if you have: 5+ years of experience in JavaScript/TypeScript development Strong expertise in React (hooks, context, state management) Solid experience with Node.js Hands-on experience with MongoDB Strong debugging skills and ability to work without full system visibility Experience working with large-scale or legacy codebases Ability to navigate poorly documented and heterogeneous systems Experience working in remote environments (Docker, SSH, remote IDEs, etc.) English level B2 or higher. Nice to have: Expertise with other Front-End framework (Angular, Vue) Experience with AI tools and integrations.