Portfolio

Projects that turn domain understanding into backend and cloud systems

2026

AWS Secure Static Hosting Infrastructure

Deployed S3 and CloudFront infrastructure with private OAC access, security headers, remote S3 state locking, and keyless GitHub Actions OIDC delivery.

Verified a repeatable least-privilege delivery path from Terraform provisioning to keyless CI deployment, HTTPS serving, and cache invalidation.

TerraformAWSS3CloudFrontGitHub Actions

Case StudyGitHub Repository

Oct. 2025 - Dec. 2025

Yangju Urban Corporation: Parking Season Pass System

Built the full user and admin workflow for monthly, daily, and employee parking passes, including eligibility checks, payment/refund states, assignment, reporting, and external integrations.

Connected payment, refund, assignment, and daily sales data into one consistent lifecycle, reducing operational friction and settlement verification effort.

JavaSpringOracleMyBatiseGovFramework

Oct. 2025 - Dec. 2025

SK Signet EV Charging Monitoring Admin

Implemented an admin system for EV charging monitoring, including RBAC, notification target groups, batch recipient insertion, login history, and IP blocking.

Consolidated group-specific notification query logic with MyBatis Dynamic SQL to keep service flows simple and extensible.

JavaSpring BootPostgreSQLMyBatisThymeleaf

Jul. 2025 - Aug. 2025

Azure Global Infrastructure & Secure Database Design

Built multi-region Azure infrastructure across Korea, US, and Europe with VNet Peering, VPN Gateway, VMSS, Application Gateway, Bastion, Azure SQL, and Cosmos DB.

Resolved traffic failures caused by Default Deny NSG rules and designed a migration path toward Private Endpoint-based database access.

AzureVMSSApp GatewayBastionAzure SQLCosmos DB

Sep. 2025

Daily Compass: Serverless Data Pipeline

Designed a cost-efficient serverless pipeline using Azure Functions, Cosmos DB, Static Web Apps, and a Node.js crawler for a personalized dashboard service.

Used Private Endpoint isolation and a proxy architecture to preserve security while restoring reliable frontend-backend communication.

Azure FunctionsCosmos DBNode.jsReactPrivate Endpoint

Case StudyGitHub Repository

Jul. 2025

RAG-Based Workplace Automation Assistant

Built an AI assistant that injects internal documents into prompts to reduce hallucination and generate consistent workflow outputs.

Designed persona-specific system prompts and a RAG flow for internal report and task-assignment use cases.

OpenAI APIRAGPrompt Engineering