ID:76067さん

# Project Overview Developed and maintained a English-learning platform offering voice and video lessons for Korean learners. The system supported lesson scheduling, payment, teacher management, and AI-assisted feedback for students. ---- # Team Information Full-stack team of 2 in-house developers. Collaborated closely with the design teams to align development with product goals. ---- # Development & Implementation A — API Modernization ## Overview: Refactored a monolithic Classic ASP system into a modular architecture to improve maintainability and scalability. ## Feature Developed: Rebuilt APIs for scheduling, report generation, and teacher/student management. ## Challenges: Code was not reusable, resulting in excessive duplication and inconsistent data handling across modules. Feature improvements required modifying multiple redundant code paths, slowing down release cycles. ## Approach & Technologies: Initially refactored Classic ASP logic into entity-based classes with internal DB access functions. Later, separated APIs into ASP.NET MVC, implementing clear Controller–Model–View layers for better maintainability. ## Results: Reduced code duplication and improved feature development speed, enabling faster iteration and integration with new systems. ---- # Development & Implementation B — WebRTC-based Lesson Integration ## Overview: Implemented WebRTC-based video lesson functionality to replace the costly VoIP system and support growing demand for online video lessons. ## Feature Developed: Developed token-based authentication, and real-time connection APIs. ## Challenges: The existing VoIP solution had high licensing costs and lacked flexibility for video-based learning expansion. ## Approach & Technologies: Translated and shared English technical documentation with the team, conducted internal reviews, and created a working prototype for proof of concept. This project marked the start of adopting ASP.NET MVC for API separation and migration. ## Results: Reduced per-session costs by 80% and improved lesson connection success rates. ---- # Development & Implementation C — AI Feedback Automation ## Overview: Developed AI-assisted writing correction and post-class feedback systems using text and voice data. ## Feature Developed: Implemented AI-based writing correction for student essays and feedback generation from VTT subtitles of recorded lessons. ## Challenges: Aimed to reduce teachers’ post-class workload while enriching the student’s learning outcome with automatically generated materials. ## Approach & Technologies: Integrated Gemini API with Google Cloud TTS and STT services to process lesson transcripts and generate contextual feedback. ## Results: Reduced manual workload for teachers and enhanced the richness of post-lesson materials, improving overall user satisfaction.

# Project Overview Developed and maintained B2B web systems for client companies, including ticketing, course registration, and venue reservation platforms. The goal was to provide customizable and reliable solutions that could efficiently support multiple clients with different operational needs. ---- # Team Information Worked in a 3-person in-house web development team with 1 external system engineer, collaborating closely with the planning and design teams. Responsible for client-specific feature customization and integration. ---- # Development & Implementation A — Ticketing System Maintenance and Customization ## Overview: Maintained and customized an online ticketing system used by multiple client companies for concert and event management. ## Feature Developed: Managed deployments combining a shared core solution with client-specific customizations, including seat management, payment flow, and ticket issuance. ## Challenges: As multiple client-specific customizations were merged into a single shared codebase, the system became unstable and difficult to maintain. ## Approach & Technologies: Separated core modules from customized client features to stabilize the system. Documented each client’s feature specifications, enabling migration of selected features between clients when needed. Although migration was done by code copying (not through dynamic toggles), it still reduced duplicated effort and improved consistency across projects. ## Results: Improved maintainability and stability of the core solution. Simplified client-specific customization and made cross-client feature reuse possible. ---- # Development & Implementation B — Venue Reservation & Course Registration System ## Overview: Developed a venue booking and course registration system by extending the existing ticketing logic to new business domains. ## Feature Developed: Enabled users to reserve venues and register for courses with integrated payment and management tools. ## Challenges: Clients required a flexible system similar to ticketing but adapted for classrooms and venues. To achieve this, the ticketing concept of “seats” was redefined as venues and students. ## Approach & Technologies: Customized database entities and seat allocation logic to fit reservation and course structures. Developed with Classic ASP, MSSQL, and jQuery, and integrated KG Inicis payment API for online transactions. ## Results: Delivered a reusable and scalable reservation system without rebuilding from scratch. Reduced development time and costs while expanding the solution’s business scope.