During January 2026, Maacosta focused on backend development for the cashapp/misk repository, addressing a complex dependency injection issue in Kotlin using Guice. They resolved a multibinding conflict in the ServiceModule by introducing a dependencyKey, ensuring unique bindings for disabled dependencies when feature switches are off. This approach preserved upstream dependency integrity and reduced the risk of runtime errors under dynamic feature toggling. Maacosta also implemented regression tests to verify that services bind as no-ops when disabled, supporting safer deployment of feature flags. Their work demonstrated depth in dependency injection and testing, improving service graph stability and maintainability.