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SANGYUN LEE (LOGAN LEE)

Software Engineer | Database Architect

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[ PROFILE OVERVIEW ]

NAME: Sangyun Lee (Logan Lee)

ROLE: Senior Software Development Engineer

EMAIL: spdhskfmeh01@gmail.com

PHONE: +1-206-999-9548

LOCATION: Everett, WA

LINKEDIN: loganleedev-0606

[ WORK EXPERIENCE & RESUME ]

RESUME PDF: DOWNLOAD PDF

Microsoft (Azure SQL Database – Storage Engine)

July 2021 – Present

Senior Software Development Engineer | Redmond, WA

  • Concurrent SGAM Updates: Architected a high-concurrency page allocation logic by redesigning SGAM update mechanisms, eliminating centralized contention bottlenecks to enable massive throughput scaling.
  • Dynamic Space Management: Designing a scalable space management architecture for Hyper Scale environments to optimize storage efficiency and reduce infrastructure costs.

Coupang (Server Backend – Order)

Oct 2020 – June 2021

Senior Software Development Engineer | Seoul, Korea

  • High-Availability Architecture: Migrated massive order datasets from Cassandra to AWS with zero downtime, ensuring 100% data integrity for high-traffic commerce systems.

Naver (Data Analysis – Shopping Data)

May 2020 – Oct 2020

Senior Software Development Engineer | Seongnam, Korea

  • Trillion-scale Real-time Pipeline: Developed a high-performance API to deliver real-time shopping data for over 30 million active users to the advertisement system.

SAP LABS KOREA (HANA Database – Storage Engine)

Nov 2016 – Apr 2020

Software Development Engineer | Seoul, Korea

  • NVM Persistence Layer: Optimized logging and persistence architecture for Non-Volatile Memory (NVM), resulting in a 70% reduction in database restart time.
  • LOB Performance: Redesigned Direct Large Object Garbage Collection logic, achieving 5x faster performance in bulk deletion and management.

Tmax data (Tibero Database – Frontend)

Aug 2013 – Oct 2016

Software Development Engineer | Seongnam, Korea

  • Domain Indexing Framework: Architected extensible indexing frameworks to support user-defined data types and complex high-performance queries.
  • PSM Debugger: Built a comprehensive debugger for Stored Procedures (PSM) to enhance system-wide developer productivity.

[ SKILLS ]

Expert: C++, SQL, C, Java

Proficient: C#, Python, Shell

[ LANGUAGES ]

Korean: Native

English: Professional Working

[ EDUCATION ]

M.S. in Computer Science | Kyungpook National University (2011 – 2013)

• Advisor: Prof. Wook-Shin Han | Database & Graph Mining Laboratory

B.S. in Computer Science | Kyungpook National University (2006 – 2011)

[ KEY PROJECTS ]

1. High-Concurrency Page Allocation Logic (Microsoft)

Overhauled SGAM update mechanisms in Azure SQL Database Storage Engine to prevent lock contention under extreme parallel workloads.

2. Zero-Downtime Data Migration Architecture (Coupang)

Migrated high-volume order datasets from Cassandra to AWS infrastructure while guaranteeing 100% data integrity and zero system outage.

3. Trillion-scale Real-time Ad Data Pipeline (Naver)

Engineered low-latency real-time API services processing shopping interaction data for 30M+ active daily users.

4. NVM Logging & Persistence Engine (SAP Labs Korea)

Architected Non-Volatile Memory persistence workflows in SAP HANA for near-instant crash recovery and reduced I/O overhead.

5. Extensible Domain Indexing Framework (TmaxData)

Designed customizable indexing modules within Tibero RDBMS engine to accelerate complex user-defined query operations.

6. TurboGraph: Billion-Scale Parallel Graph Engine (KNU Lab)

Developed a high-performance disk-based graph computation engine processing billion-scale graph datasets on a single commodity PC.

[ PUBLICATIONS ]

[ GAME ]

[ SYSTEM NOTICE ]

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