Jonghun An
Software Engineer
βœ‰οΈ [email protected]
πŸ“ž 010-9039-3872
Current Employer:
Company: KT
Title: Senior Engineer
Duration: July 2025 ~ Present
Key Responsibilities: Research and development of Agent Orchestrator
Key Technology Stack:
  • Backend: Python (FastAPI), Spring (Java, Kotlin), Node.js
  • Database: Cosmos, Postgres, MySQL, Oracle, MongoDB, Redis
  • Others: Kafka, Datadog, ElasticSearch
Key Experience & Project Achievements
λ²„ν‚·μŠ€ν† μ–΄ (July 2023 ~ March 2025)
Position: Backend Developer (Senior Staff)
Tech Stack: Spring (Java, Kotlin), FastAPI (Python), MySQL, Oracle, Docker, Kafka, Datadog, Redis
Key Projects:
1. 크리슀λͺ° Renewal and Infrastructure Migration
  • Led migration from Java Spring to Python FastAPI
  • Executed zero-downtime migration from Oracle to MySQL
  • Transitioned from EC2 to AWS ECS Fargate, automated CI/CD
Achievements: 40% reduction in operating costs, 30% decrease in service failures
2. Rearchitected Order Service Backend System
  • Eliminated Oracle Procedures/Views, converted to JPA-based ORM
  • Implemented domain-driven design and built microservices
Achievements: 25% improvement in order response time
3. Enhanced Marketing Data Integration System
  • Introduced asynchronous event pipeline using AWS SQS + Lambda
Achievements: Improved main service response speed, ensured data transmission stability
λΈ”λ‘μ²΄μΈλž©μŠ€ (February 2022 ~ April 2023)
Tech Stack: NestJS, MySQL, Cassandra, Redis, Kubernetes, ElasticSearch
Key Achievements:
Chat Server Development: Reduced message notification failure rate from 3% to 0%
Global File Transfer Server: Improved 4MB file transfer speed from 15 seconds to under 2 seconds
Internal Data Collection System: Reduced manual log analysis time by over 90%