September 2025 monthly summary focused on delivering clear, business-value driven documentation improvements for resource planning on LUMI-C. Key features delivered: Updated memory allocation guidance in Lumi-userguide to help users allocate memory as total node memory minus 32GB on the standard partition, enabling more precise and efficient memory usage. Major bugs fixed: none reported this month. Overall impact: reduced risk of memory over- or under-allocation, improved user guidance, and lower support overhead through clearer documentation and reproducible guidance. Technologies/skills demonstrated: documentation engineering, memory/resource planning knowledge, version-controlled content with clear commit traceability.

Delivered focused documentation enhancements for Python scheduled jobs on LUMI via Lumi-userguide, covering serial and containerized MPI workflows, job arrays for data post-processing, enhanced data file organization guidance, and clearer submission counts. These updates improve user onboarding, reduce misconfigurations, and support scalable HPC workflows.