Senior Node.js. Developer (Sunday–Thursday working week)

ZentixSoft is looking for a Senior Node.js Engineer! 🚀 Format: Full-Time Outstaffing , long-term remote project. You will focus on building robust, high-performance, data-heavy product interfaces and enterprise backend workflows. Key Responsibilities: Design and build backend services in Python and/or Node.js Own API design - contracts, versioning, validation, documentation and backwards compatibility Implement asynchronous and background processing using queues, workers and event-driven patterns Handle retries, idempotency and failure paths so that processing stays reliable under load Containerise services and deploy them on Azure with automated CI/CD Maintain test coverage, observability and logging to support debugging and production support Investigate and resolve production issues, and optimise performance and scalability Participate in code review, technical discussions and estimation Requirements: 6+ years of backend engineering experience Strong Python and/or Node.js at a senior level Proven API design experience beyond endpoint implementation Hands-on experience with asynchronous processing — message queues, background workers, event-driven architecture Experience with Docker and containerised deployment Practical Azure experience Strong testing discipline and production ownership Good communication skills and ability to work independently Nice to Have: Kubernetes, Helm and infrastructure as code PostgreSQL and NoSQL databases at scale Experience mentoring engineers or leading a small team Exposure to LLM integration within backend services Experience in a consulting or client-facing environment Experience in the energy sector Availability to work a Sunday–Thursday working week