I'm a backend developer focused on solving everyday inconveniences through code. My goal is to make incremental improvements that eventually lead to significant transformations. Currently serving as an industrial technical personnel at a Warehouse Platform company.

• 🎓 Kwangwoon University, Software Department (4th year, on leave)
• 📧 Email: hyunjun2087@gmail.com
• 📱 GitHub: Tianea2160
• 💼 LinkedIn: LinkedIn Profile
• 📝 Blog: Technical Blog

• 2023.07.10 - Present: Software Engineer at Techtaka (ARGO)
  • Serving as an industrial technical personnel
  • Contributed to securing Series B investments from Altos Ventures through warehouse process improvements
  • Improved operational efficiency by optimizing work division strategies
  • Implemented distributed lock system and Kafka-based performance improvements

• Problem: Order cancellations required product restocking, causing resource waste
• Solution: Implemented delayed work creation based on remaining work counts and improved process flow
• Impact:
  • Secured ~2 hours 10 minutes of order cancellation time without restocking per order
  • Despite 35% increase in order cancellations, achieved 7.8% decrease in restocking requirements
  • Designed business architecture using Choreography-based Saga pattern for inventory location recommendations

• Problem: Inefficient sorting without limits on product types per container
• Solution: Experimented with expanding maximum product types from 1 to 3, then 5 per container
• Impact:
  • Reduced average processing time per order by 42.86% (70 seconds to 40 seconds)
  • Decreased collection tasks by 78.9% (2,388 to 505)
  • Achieved daily workforce reduction of approximately 1.33 workers

• Problem: Occasional duplicate work completion events causing inventory double-counting
• Solution: Implemented Redis-based distributed lock with custom annotation (@DistributedLock)
• Impact:
  • Completely eliminated duplicate processing issues
  • Currently used in more than 4 domains across the system
  • Enhanced developer productivity by simplifying lock implementation

• Problem: Processing 300 orders took 10-15 minutes, exceeding client timeout (1 minute)
• Solution: Transformed synchronous API calls to asynchronous Kafka-based processing
• Impact:
  • Reduced API response time from ~12 minutes to ~1 second (99.86% decrease)
  • Decreased actual data processing time from 10-12 minutes to ~3 seconds (up to 97.5% reduction)
  • Eliminated POD CPU overload issues (previously reaching 100%)

• Problem: Lack of volume management system for same-day receipts, risking SLA violations
• Solution: Led the development of a processing type capacity management system
• Impact:
  • Prevented center overload by blocking excess orders during 31% of operating days
  • Satisfied Naver direct contract SLA and improved customer satisfaction
  • Enabled data-driven resource allocation through receipt calendar functionality

• Nimble: Platform for designing, reviewing, and sharing personal running courses (B-side Potent Day Hackathon)

• Ooi: Dashboard service analyzing data between Naver Cafe posts and vehicle repair shops (7th Industry-Academic Cooperation Project, University President's Award)

• KW Dormitory: Dormitory notification monitoring service

• MRP: Restaurant recommendation web service for locations near subway stations

• AWS Certified Practitioner
• Techtaka In-house Hackathon 1st Place: In-house Hackathon Newspaper
• DDD IT Union Club 9th Generation