• [kt cloud TECH UP] Backend Fundamentals for Collaboration: Global Exception RefactoringHow implementing a Global Exception Handler and an ErrorCode Enum drastically reduced communication overhead between frontend and backend teams.

  2/21/2026
  
• [kt cloud TECH UP] Zero Load Media Handling: S3 Presigned URLs & State ManagementSharing architectural insights on utilizing AWS S3 Presigned URLs for direct client uploads to eliminate backend bottlenecks, alongside robust state management for garbage collection.

  2/21/2026
  
• [kt cloud TECH UP] Controlling the Influx: API Gateway Waiting Room and Redis Rate LimitingGateway’s second mission to withstand 15,000 concurrent users. Exploring the WaitingRoom filter, Redis-backed Rate Limiting, and Bot Detection mechanisms.

  2/20/2026
  
• [kt cloud TECH UP] Anti-Ping-Pong in a 17-Person Team: Smashing Silos with DSUReflections on the vital soft skills required to manage a massive 17-person team across Design, PM, FE, BE, Infra, and AI. Breaking silos using Daily Stand-Ups and visual documentation.

  2/19/2026
  
• [kt cloud TECH UP] API Gateway Auth Integration and Header Spoofing DefenseAPI Gateway as the vanguard for 15,000 concurrent connections. The advantages of unified JWT processing and how we actively defeated a fatal "X-User-Id Header Spoofing" vulnerability.

  2/18/2026
  
• Java Clean Code and TDD Retrospective: The StringCalculator Refactoring JourneyA retrospective on exploring TDD methodologies (Classicist vs. London school), managing JUnit shared resources, and understanding Java’s double escape mechanism while building a simple String Calculator for the Woowahan Tech Course.

  2/17/2026
  
• [kt cloud TECH UP] Next.js vs Spring Boot: Who Holds the Burden of Auth?A fierce architectural debate between Frontend and Backend regarding authentication. Balancing Next-Auth centralization against Client-Direct API routing for high-traffic ticketing.

  2/12/2026
  
• [kt cloud TECH UP] The Auto-Scaling Trap: Why HPA Won’t Save Your Ticketing ServerA reality check from kt cloud mentoring on the lethal latency of Auto-Scaling during Flash Crowds, and the operational necessity of Pre-Provisioning (Infra Warm-up).

  2/6/2026
  
• [kt cloud TECH UP] Perfect Module Isolation: Gradle api vs implementationExploring why our team opted for "implementation" over "api" in a Spring Boot multi-module environment to fortify encapsulation and establish strict build boundaries.

  2/6/2026
  
• Building a Full-Stack E-commerce Platform with NestJS and Next.jsWhy NestJS over Spring? Sharing the reasoning and architecture design process behind selecting PostgreSQL and Prisma within a pnpm monorepo environment.

  2/5/2026
  

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