Skip to content
View sangmu1126's full-sized avatar

Block or report sangmu1126

Block user

Prevent this user from interacting with your repositories and sending you notifications. Learn more about blocking users.

You must be logged in to block users.

Maximum 250 characters. Please don't include any personal information such as legal names or email addresses. Markdown supported. This note will be visible to only you.
Report abuse

Contact GitHub support about this user’s behavior. Learn more about reporting abuse.

Report abuse
sangmu1126/README.md

👋 Hi, I'm Sangmu

Backend & Infrastructure Engineer


Email  Portfolio  GitHub

  • Backend Development: Python (FastAPI/Django), Node.js, Java (Spring Boot)
  • Cloud Infrastructure: AWS, Terraform, Docker, Linux System Programming
  • Focus: Building scalable distributed systems and optimizing resource efficiency.

� Tech Stack

Languages

Python Node.js Java JavaScript

Infrastructure & Cloud

AWS Terraform Docker Linux

Database & Tools

MySQL Redis ElasticSearch Git


🌟 Featured Projects

Building a High-Performance FaaS Platform from Scratch (on EC2 & Docker)

"Why accept the Cold Start latency of managed services when you can engineer it away?"

Designed and implemented a proprietary Serverless Engine to overcome the limitations of AWS Lambda (Cold Start & Monitoring).

  • Core Engine: Built a custom orchestrator replacing Kubelet, managing container lifecycles via direct Docker Socket control.
  • Zero Cold Start: Engineered a "Heavy Warm Pool" architecture, reducing function wakeup time by 95% (sub-100ms).
  • Kernel-Level Tuning: Developed a Smart Auto-Tuner leveraging Linux Cgroup v2 metrics (memory.peak, cpu.stat) to optimize resource allocation automatically.
  • Event-Driven Scaling: Implemented a SQS Backlog-based autoscaler using Terraform ASG policies to handle burst traffic reliable.

Large-scale Power Data Analysis & AI Model Serving

Backend Lead & Data Engineer

  • Pipeline Optimization: Refactored Airflow ETL workflows, reducing daily data processing time by 60%.
  • Real-time Serving: Wrapped heavy ML models with FastAPI for low-latency inference, ensuring high availability for end-users.

Elasticsearch-based GEO Search Platform

Backend Developer

  • Search Performance: Migrated complex RDB queries to Elasticsearch, boosting search speed from 2.0s to 0.2s (10x) using inverted indexes.
  • DevOps: Standardized the entire development lifecycle using Docker Compose, reducing onboarding time for new team members.

Google Solution Challenge 2024 - Global Top 100

Backend Architecture & Cloud Deployment

  • Global Scalability: Designed a scalable backend usage Firebase & Cloud Functions to support users worldwide.
  • Recognition: Selected as a Top 100 project globally, recognized for technical execution and social impact.

Pinned Loading

  1. Infra-controller Infra-controller Public

    A FaaS Control Plane server

    JavaScript

  2. Infra-worker Infra-worker Public

    A FaaS Data Plane server

    Python

  3. Infra-terraform Infra-terraform Public

    A FaaS terraform

    HCL

  4. EveryTown EveryTown Public

    Java

  5. packettracer-cloud-vpn-simulation packettracer-cloud-vpn-simulation Public

    Practice project for simulating cloud-connected VPN infrastructure in Cisco Packet Tracer.

  6. Today_I_Learned Today_I_Learned Public

    Log what I learn, study today