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Development Process Improvements
Day1 Company · Sep 2024 - Feb 2026
JavaSpring Boot
Tasks
- •Introduced a Facade layer into the Spring MVC structure and established a Controller -> Facade(gateway) -> Service -> Repository development rule
- •Kept Service and Repository responsibilities domain-specific and handled service orchestration in Facades
- •Reduced duplicated business logic and improved domain-logic reuse
- •Standardized response and error handling
- •Replaced 200 responses containing 4xx/5xx status with HTTP status code-based responses
- •Made API calls traceable by response code in monitoring, improving incident-response speed
- •Reduced frontend/backend communication cost by standardizing response and error formats
- •Redesigned hardcoded product structures into a metadata-based lesson-pass domain so new products such as double packs or Japanese courses can launch without code changes
- •Improved lesson-pass admin features and consolidated shared logic, reducing operations-team lesson-pass management time by more than 50%
- •Moved time handling from KST-based logic to UTC-based logic to improve timezone handling for international users
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Standardizing API Responses and Error Handling - Getting HTTP Status Codes Right
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