Software engineering → Digital twins, simulation & optimization
I build and operate backend systems, and I am preparing to begin graduate study at Dongguk University in March 2027, with Prof. Sojung Kim in the Simulation-Based Optimization Laboratory.
My research interests center on modeling complex systems and using simulation and optimization to support better decisions. I bring industry experience in event-driven services, data consistency, and performance evaluation.
Website · CV · Publications · Writing & Talks · Email
한국어 소개
안녕하세요, **장준환 (Chris)**입니다. 백엔드 서비스를 개발·운영해 왔으며, 2027년 3월 동국대학교 대학원 입학을 앞두고 김소정 교수님의 시뮬레이션 기반 최적화 연구실에서 연구를 시작할 예정입니다.
디지털 트윈, 시뮬레이션, 최적화를 통해 복잡한 시스템을 이해하고 더 나은 의사결정을 지원하는 데 관심이 있습니다. 이벤트 기반 서비스, 데이터 정합성, 성능 개선의 실무 경험을 연구로 이어가고자 합니다.
- Digital twins — modeling real-world systems and connecting models with operational data.
- Simulation — agent-based modeling, discrete-event simulation, and system dynamics.
- Optimization — simulation-based optimization and operations research for decisions under uncertainty.
These are my intended graduate research and learning areas, aligned with Prof. Sojung Kim’s work. I plan to develop skills in model implementation, calibration, sensitivity analysis, and reproducible experiments.
| Area | Practical experience |
|---|---|
| Backend systems | Java, Spring Boot, Spring WebFlux, API design and service operation |
| Events & consistency | Kafka, Redis, concurrency control and distributed locks |
| Performance | SQL execution plans, indexing, caching and API profiling |
| Data workflows | MySQL, webhook integrations and reactive data collection |
| Institution | Program | Period |
|---|---|---|
| Dongguk University | Incoming graduate student · Prospective advisor: Prof. Sojung Kim | Mar 2027 (expected) |
| Hanyang University | Master’s program in Computer Engineering · Graduate School of Engineering | Entered Sep 2025 |
| Dongyang Mirae University | Bachelor’s degree in Computer Software Engineering · Advanced major program | Mar 2023 – Feb 2024 |
| Organization | Focus | Period |
|---|---|---|
| TONYMOLY | Commerce services, caching, concurrency control and query optimization | Mar 2024 – Jan 2026 |
| Blumn AI | Messaging and chatbot platforms, webhooks and reactive services | Feb 2023 – Mar 2024 |
| Mesh Korea (Vroong) | Delivery and fulfillment backend services | Sep 2022 – Oct 2022 |
| F1 Tech Systems | Systems integration and platform backend development | Nov 2020 – Jul 2022 |
Experience, responsibilities & outcomes →
Data Consistency in High-Concurrency Events: A Redis Distributed Lock Case Study
SIPE 4th Conference · Aug 2, 2025 · Presented in Korean
A production case study on race conditions, Redis Lettuce distributed locks, fair access, and architectural alternatives.
- Caching Under Traffic Surges
- Distributed Locks and Consistent State
- Evaluating and Improving API Performance — Part 1 · Part 2
Articles are in Korean; the titles above are English descriptions.
| Community | Role | Period |
|---|---|---|
| CodeIt Sprint, Spring 5th | Backend mentor | 2025.07 – 2026.01 |
| Guro Youth Mentor | Backend mentor | 2025.06 – 2025.12 |
| CMC 17th | Server developer | 2025.05 – 2025.08 |
| SIPE | Member · 3rd–5th cohorts | 2024.10 – 2026.07 |
| JAVACAFE | Member | 2024.09 – Present |
Open to conversations about simulation, optimization, and software engineering.