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HS

Heesu Sim

Security Engineer

📍 Austin, TX, USA

🟢Aping In

Security engineer with 5+ years of experience specializing in detection engineering, vulnerability management, compliance, and security automation. Experienced in analyzing large-scale security logs to perform root cause analysis and drive remediation and validation of vulnerabilities identified through vulnerability scanning. Received an “Outstanding” performance rating at AhnLab for strong ownership and effective cross-functional collaboration.

Work Preferences

Salary

GBP 110,000150,000

Skills

Elasticsearch8/10
Detection Engineering8/10
Security Engineering8/10
Data Pipelines8/10
SQL7/10
Java (7/10)Splunk (7/10)Linux (7/10)Vulnerability Management (7/10)Python (7/10)AWS (6/10)CI/CD (6/10)Docker (6/10)Go (6/10)Grafana (6/10)JavaScript (6/10)Prometheus (6/10)Spring Boot (6/10)React.js (5/10)Kubernetes (5/10)

Work Experience

Graduate Research Assistant

Center for Analytics and Data Science, Texas State University

Nov 2025Present

Transforming raw relational data (13GB of CSV files) into structured datasets to enable scalable network analysis.

Software Engineer

AhnLab, Inc

Sept 2019Oct 2022

Designed and implemented an end-to-end data pipeline for large-scale security logs (EDR, Firewall, IPS) supporting 150k logs/sec. Designed detection rules using network security device logs, automated log parsing, built centralized monitoring for 5,000+ devices, developed interactive dashboards, implemented RBAC within IAM, and built a network-based log forwarding module. Earned sole 'Outstanding' rating (1 of 10 engineers).

Software Engineer

Secuve

Apr 2017Aug 2019

Orchestrated and modularized the core log data pipeline, replacing legacy components and enabling scalable ingestion, normalization, and loading into Elasticsearch. Spearheaded ISO/IEC 15408 (Common Criteria) certification process collaborating with external auditors.

Education

Texas State University

MSc · Computer Science, Concentration: Data Science

20242026

Handong University

BSc · Computer Science

20082016