During January 2026, this developer focused on enhancing the reliability and accuracy of the YunaiV/ruoyi-vue-pro backend by addressing three critical bugs. Using Java and the Spring Framework, they resolved a stock calculation overflow for SPUs by refining the summation logic, ensuring accurate inventory reporting. They also improved analytics by initializing SKU-level sales tracking during product creation, enabling more granular sales data. Additionally, they enforced stricter order validation for self-pickup scenarios, requiring an 'undelivered' status before pickup to reduce processing errors. Their work demonstrated solid backend development skills and contributed measurable improvements to business metrics and system robustness.