Janez developed a progressive loan interest accrual control feature for the openMF/web-app repository, addressing the need to prevent interest from being calculated on past-due principal balances for progressive loan types. The solution involved adding a configurable loan product setting, implemented as a checkbox in the UI, with conditional display logic to ensure clarity for users. Janez aligned the front-end changes with API-level enforcement, following the FINERACT-1981 specification. Using Angular, TypeScript, and CSS, Janez delivered a targeted enhancement that improved the accuracy and configurability of interest calculations, demonstrating a focused approach to solving a nuanced business requirement within a short timeframe.