Worked on optimizing memory usage within the JetBrainsRuntime repository by refactoring the java.time subsystem’s date and time representations. Focused on reducing the storage footprint of LocalDate, MonthDay, YearMonth, and HijrahDate by changing their month and day fields to use the byte data type. This Java development effort targeted improved cache locality and lower per-instance memory consumption for date-heavy workloads. The work involved API refactoring and memory optimization techniques, laying the groundwork for broader efficiency improvements in core date-time classes. No bugs were addressed during this period, with the primary contribution being a targeted feature enhancement in Java.