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Sangwoo Lee

Full-Stack Software Engineer

Location Seoul, Korea Joined Joined on  Personal website https://linktr.ee/sangwoo_rhie?utm_source=linktree_profile_share&ltsid=eec1b914-2b5a-4972-b5a5-30b40 github website

Work

Software Engineer at GOODTV in Seoul, Korea

When 502 Bad Gateway Revealed My Firebase Connection Pool Mistake (and How I Fixed It)
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When 502 Bad Gateway Revealed My Firebase Connection Pool Mistake (and How I Fixed It)

#firebase #nginx #nestjs #node
Comments
5 min read

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From Slow Aggregations to Instant Queries: Optimizing Push Notification History with Summary Tables
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From Slow Aggregations to Instant Queries: Optimizing Push Notification History with Summary Tables

#firebase #pushnotification #database #query
Comments
14 min read
Measuring Push Notification Engagement: Tracking Open Rates for 500K+ Campaigns
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Measuring Push Notification Engagement: Tracking Open Rates for 500K+ Campaigns

#openrates #pushnotification #firebase #nestjs
Comments
12 min read
[AWS] 7. AWS Route 53, DNS (Domain Name System), Routing Policies
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[AWS] 7. AWS Route 53, DNS (Domain Name System), Routing Policies

#aws #beginners #devops #networking
Comments
8 min read
[AWS] 6. AWS Fundamentals: RDS (Relational Database Service) + Amazon Aurora + ElastiCache
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[AWS] 6. AWS Fundamentals: RDS (Relational Database Service) + Amazon Aurora + ElastiCache

#aws #beginners #cloud #database
Comments
8 min read
[AWS] 5. High Availability and Scalability, Elastic Load Balancer (ELB), Auto Scaling Groups (ASG)
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[AWS] 5. High Availability and Scalability, Elastic Load Balancer (ELB), Auto Scaling Groups (ASG)

#architecture #aws #devops
Comments
9 min read
Beyond Token Validation: Measuring Real Device Delivery Rates with Firebase FCM
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Beyond Token Validation: Measuring Real Device Delivery Rates with Firebase FCM

#firebase #fcm #pushtoken #pushnotification
Comments
12 min read
Validating 500K Push Tokens with Firebase Dry-Run
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Validating 500K Push Tokens with Firebase Dry-Run

#firebase #dryrun #pushtoken #bullmq
Comments
14 min read
Building Real-time Progress Tracking for Mass Push Notifications with Redis and Polling
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Building Real-time Progress Tracking for Mass Push Notifications with Redis and Polling

#redis #polling #nestjs #bullmq
Comments
7 min read
Eliminating SSH Dependencies: Migrating to Self-Hosted GitHub Actions Runners for Secure Blue-Green Deployments
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Eliminating SSH Dependencies: Migrating to Self-Hosted GitHub Actions Runners for Secure Blue-Green Deployments

#devops #docker #githubactions #cicd
Comments
20 min read
Building a Production-Ready Scheduled Push Notification System with NestJS Cron and Firebase
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Building a Production-Ready Scheduled Push Notification System with NestJS Cron and Firebase

#nestjs #crontab #firebase #backend
Comments
12 min read
[AWS] 4. EC2 Instance Storage Section, EBS (Elastic Block Store), AMI (Amazon Machine Image), EFS (Elastic File System)
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[AWS] 4. EC2 Instance Storage Section, EBS (Elastic Block Store), AMI (Amazon Machine Image), EFS (Elastic File System)

#aws #ebs #ami #efs
Comments
8 min read
[AWS] 3. EC2 - Solutions Architect Associate Level (Private IP vs Public IP), Elastic IP
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[AWS] 3. EC2 - Solutions Architect Associate Level (Private IP vs Public IP), Elastic IP

#architecture #aws #networking #programming
Comments
6 min read
[AWS] 2. EC2 (Elastic Compute Cloud) Instance Fundamentals, SSH
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[AWS] 2. EC2 (Elastic Compute Cloud) Instance Fundamentals, SSH

#aws #beginners #cloud
Comments
10 min read
Building a Zero-Downtime CI/CD Pipeline: Blue-Green Deployments for 100K+ Daily Requests
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Building a Zero-Downtime CI/CD Pipeline: Blue-Green Deployments for 100K+ Daily Requests

#devops #docker #nginx #githubactions
4
Comments
17 min read
Stop That Notification! How I Built Graceful Cancellation for Mass Push Campaigns
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Stop That Notification! How I Built Graceful Cancellation for Mass Push Campaigns

#node #redis #firebase #shutdown
5
Comments
13 min read
[AWS] 1. IAM (Identity and Access Management) & AWS CLI (Command Line Interface)
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[AWS] 1. IAM (Identity and Access Management) & AWS CLI (Command Line Interface)

#aws #iam #ec2 #devops
Comments
5 min read
Optimizing Push Notification Logging at Scale - From Synchronous Bottleneck to Async Batching
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Optimizing Push Notification Logging at Scale - From Synchronous Bottleneck to Async Batching

#nestjs #performance #database #optimization
2
Comments
12 min read
Breaking Down a 1,500-Line Firebase Service - Clean Architecture in Practice
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Breaking Down a 1,500-Line Firebase Service - Clean Architecture in Practice

5
Comments
16 min read
Decoupling Firebase Push Notification Logic with BullMQ - From Synchronous Chaos to Asynchronous Elegance
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Decoupling Firebase Push Notification Logic with BullMQ - From Synchronous Chaos to Asynchronous Elegance

#nestjs #bullmq #firebase #architecture
3
Comments
8 min read
Firebase Push Tokens Are Device-Specific, Not User-Specific: A Critical Refactoring
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Firebase Push Tokens Are Device-Specific, Not User-Specific: A Critical Refactoring

#firebase #nestjs #typescript #notifications
1
Comments
7 min read
Refactoring Mass Push Notifications: From Offset to Cursor Pagination
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Refactoring Mass Push Notifications: From Offset to Cursor Pagination

#firebase #nestjs #pagination #cursor
3
Comments
9 min read
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