Dev shares key lessons from building a production LMS with Node.js and AWS

A developer has detailed the technical decisions and hard-learned lessons from building a production Learning Management System used across web and mobile platforms. The system was built using Node.js with NestJS, MongoDB, AWS, Cloudflare, Docker, React/Next.js, and Flutter, serving students and tutors handling live classes, payments, and academic activities. The author found that Node.js handles I/O-heavy LMS workloads effectively, but that performance issues most often stemmed from poor database queries, missing indexes, and weak caching rather than the runtime itself. On the MongoDB side, treating schema design as optional led to problems, particularly when embedding high-growth data like attendance records inside parent documents instead of using dedicated collections. The post concludes that identifying and fixing the actual bottleneck — such as an unindexed query — is more effective than switching technology stacks entirely.