About

Work Experience

• Full Stack Engineer / Web Service Lead, Cinamon

  Apr, 2023 - Present

  Led full-stack development of AI video generation service and cloud game streaming platform, managing development team and contributing to product strategy.

  • Designed and developed CineV Shorts, a prompt-based video generation service using LLM and Unreal Engine APIs. Architected scalable microservices with queue-worker patterns for GPU node orchestration and async task processing.

  • Built cloud game streaming service using Unreal Engine PixelStreaming protocol and WebRTC technology. Implemented serverless architecture with AWS API Gateway, Lambda, and WebSocket for authentication, queue management, and reconnection mechanisms. Designed real-time interaction protocols between streamers and players, optimizing streaming performance and user experience.

  • Developed and operated services across AWS and Alibaba Cloud multi-cloud environments. Implemented Infrastructure as Code (IaC) using Pulumi for automated infrastructure management. Built and maintained microservices on Kubernetes with Istio service mesh architecture.

  • Built CI/CD pipeline with GitHub Actions. Managed container images using AWS ECR. Automated deployments with ArgoCD and set up automated testing.

  • Built service monitoring system using SigNoz and OpenTelemetry(o11y). Implemented distributed tracing to track requests across services. Identified performance bottlenecks and resolved service issues through trace analysis.

  • Developed global outsourcing management system for Unreal Engine motion data annotation. Built automated workflow using AWS MTurk to distribute tasks to worldwide workers. Implemented browser-based annotation and review tools with Three.js for seamless user experience. Achieved 90% cost reduction and 4x faster processing compared to previous methods.

• Backend Engineer / Team Lead, Bbangya Networks

  Apr, 2021 - Mar, 20231 year 11 months

  Led backend team developing chat and streaming services for 300,000+ concurrent users. Modernized legacy systems and improved service reliability and team efficiency.

  • Built high-traffic chat service using Node.js, Socket.io, Redis pub/sub, and AWS Lambda. Separated chat service from main application and introduced Event-driven Architecture to remove dependencies between services. Successfully handled 300,000 concurrent users with improved stability and made the chat service reusable across multiple platforms.

  • Refactored authentication service and consolidated multiple authentication channels into a unified system. Executed zero-downtime migration of user data while maintaining service availability. Reduced authentication-related complaints by over 90% compared to previous system.

  • Developed backend boilerplate and refactored legacy codebase using layered architecture. Implemented standardized development patterns and code quality standards across the team. Improved code maintainability and reduced development time for new features.

  • Built real-time live streaming service handling up to 200,000 concurrent viewers for major K-pop concerts. Redesigned legacy infrastructure and successfully delivered streaming services for artists including Cha Eunwoo, WINNER, and iKON.

• Backend Engineer / PO, LaundryHomes

  Jan, 2020 - Apr, 20211 year 3 months

  Led backend development and team management for laundry service startup. Built complete technical infrastructure, achieving 50,000 users and processing 100,000 laundry orders.

  • Built backend infrastructure and RESTful APIs using Python and Django for contactless laundry service. Led team building and managed development from design to deployment.

  • Developed backend systems for customer and staff mobile apps. Created workflow allowing customers to track laundry progress while staff manage pickup and delivery through smartphones.

  • Built real-time management system for laundry factory operations. Implemented tracking system providing real-time status updates for individual items and business data analytics.

  • Developed payment system supporting simple payments and subscriptions. Achieved under 3-second payment processing with optimized payment flow.

  • Built referral system and integrated chatbot to reduce costs. Cut marketing expenses through customer referrals and reduced CS workload with automated support.

• Backend Engineer, M&T

  Apr, 2018 - Apr, 20191 year

  Modernized legacy backend systems and implemented microservices architecture for improved performance and maintainability.

  • Refactored PHP 4 to PHP 7 and implemented Slim Framework for improved performance and maintainability. Successfully migrated legacy codebase to new architecture, reducing technical debt and improving code quality.

  • Migrated from monolithic to microservices architecture. Implemented ELK stack for centralized logging and monitoring.

  • Developed external service point integration and various event features.

• Security Engineer, NileSoft

  Nov, 2012 - Nov, 20175 years

  Developed security vulnerability detection systems and provided technical consulting services.

  • Built script-based vulnerability detection service meeting Financial ISAC compliance standards.

  • Developed cross-platform security agent in C for centralized vulnerability management on Unix, Linux, and Windows.

  • Provided technical consulting to financial, government, and military clients including major banks and government institutions.

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