Sang-jun Seok
백엔드 개발자 at OpsNow.io
Seoul, South Korea
Summary
👤
Senior🎓
Top SchoolSang-jun Seok is a Java/Spring backend engineer with 9 years of experience building 0→1 products in startup environments and managing cloud infrastructure on both AWS and GCP. He has led cloud-native migrations, implemented zero-downtime deployments, and delivered measurable cost reductions (e.g., ~80% dev-server savings) by containerizing services and adopting serverless patterns. His work spans backend architecture, asynchronous processing, image/video AI pipelines, DB migrations and testing automation—highlighted by moving QueryDSL to jOOQ, introducing Testcontainers for reliable integration tests, and refactoring uploads to pre-signed URLs to solve load issues. Comfortable across the full delivery lifecycle, he also automated billing, OCR-based workflows, and ensured payment reliability with DB locks and batch reprocessing. Based in Seoul, Sang-jun pairs pragmatic engineering with infrastructure savvy and is open to technical collaborations and project discussions.
9 years of coding experience
학사, 컴퓨터공학, 4.3/4.5, 학사, 컴퓨터공학, 4.3/4.5 at 대진대학교 (Daejin University)
Github Skills (2)
react2
javascript2
Programming languages (1)
Github contributions (5)
seosaju/django_face_recognition
Oct 2020 - Nov 2020
Contributions:1 release, 56 commits, 55 pushes in 1 month
seosaju/SoupKitchen
Apr 2019 - May 2020
Contributions:5 pushes, 1 branch in 1 year
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