Sangmin Lee - DEV Community

Sangmin Lee

Jul 13

Solo Claude SaaS Cost Diary: $4 in Month 1, $87 in Month 6

#cost #saas

5 min read

Sangmin Lee

Jul 13

Cursor Claude Code: What Changes in Your First Week (Honest Diary)

#cursor #comparison #migration

5 min read

Sangmin Lee

Jul 12

Korean vs English: Do You Pay More Tokens for the Same Prompt?

#tokens #cost #korean #benchmark

3 min read

Sangmin Lee

Jul 12

Claude + Voyage AI Embeddings: The Anthropic-Recommended Stack (2026)

#embeddings #rag #rerank

2 min read

Sangmin Lee

Jul 12

Claude API + Pinecone Vector DB: Production RAG Pipeline (2026)

#pinecone #rag #embeddings

1 min read

Sangmin Lee

Jul 12

Claude API Sampling: Temperature, Top-P, Top-K, Stop (2026)

#parameters #temperature #sampling #developer

5 min read

Sangmin Lee

Jul 12

Claude API Model Fallback & Circuit Breaker: Production Resilience (2026)

#resilience #fallback #production

2 min read

Sangmin Lee

Jul 11

Claude API + Hono Framework: Edge-First Setup (Bun, Cloudflare, 2026)

#hono #bunjs #edge

1 min read

Sangmin Lee

Jul 11

Claude API Evaluation: LLM-as-Judge, Golden Sets, Regression (2026)

#evaluation #eval #testing #production

1 min read

Sangmin Lee

Jul 11

Claude Prompt Injection Defense: 7 Patterns That Work (2026)

#security #defense #production

1 min read

Sangmin Lee

Jul 11

Claude Code Keyboard Shortcuts & Power Workflows (2026)

#shortcuts #productivity #workflow

2 min read

Sangmin Lee

Jul 11

Claude API + n8n: Build AI Workflows in 30 Minutes (2026)

#n8n #automation #workflow

3 min read

Sangmin Lee

Jul 10

How to Use Claude Code Effectively: Power User Guide 2026

#productivity #developer

3 min read

Sangmin Lee

Jul 10

How to Install Claude Code — Complete Setup Guide 2026

#install #setup

1 min read

Sangmin Lee

Jul 10

Claude Free Plan vs Pro 2026 — Limits, Models, and When to Upgrade

#claude #pricing #pro

4 min read

Sangmin Lee

Jul 10

Claude Code Context Management: Keep Sessions Sharp (2026)

#context #productivity

5 min read

Sangmin Lee

Jul 10

Claude API JSON Mode: Force JSON Output Every Time (2026)

#json #python #developer

3 min read

Sangmin Lee

Jul 9

Claude Extended Thinking: How to Use Thinking Mode (2026 Guide)

#sonnet #opus

2 min read

Sangmin Lee

Jul 9

Claude Code Test Generation: Auto-Write Unit & Integration Tests

#testing #pytest #jest #tdd

4 min read

Sangmin Lee

Jul 9

Claude Code for Data Science: EDA & Visualization Workflows

#pandas #python #eventdriven

3 min read

Sangmin Lee

Jul 9

Claude API Webhook Integration: Async Patterns and Event-Driven AI

#webhooks #async #fastapi #node

5 min read

Sangmin Lee

Jul 9

Claude API Production Checklist: 25 Things Before You Ship

#production #deployment #checklist

10 min read

Sangmin Lee

Jul 8

Claude Agents in Production: Cost, Latency & Observability (2026)

#production #benchmark

5 min read

Sangmin Lee

Jul 8

한국 SaaS 창업자 세무·결제 완전가이드 (2026): 부가세·법인세·원천징수부터 Toss Payments까지

#saas #gumroad

2 min read

Sangmin Lee

Jul 8

Claude API: Streaming vs Batch — Which Saves More (2026)

#streaming #latency #throughput

3 min read

Sangmin Lee

Jul 8

TypeScript MCP Server on Bun: 60ms Cold Start (2026)

#mcp #typescript #bunjs #claude

2 min read

Sangmin Lee

Jul 8

Claude Code Monorepo Guide: CLAUDE.md & Cost Control (2026)

#monorepo #turborepo #pnpm #nx

4 min read

Sangmin Lee

Jul 7

Claude API Rate Limits: Tier 1-4, 429 Recovery (2026)

#429 #retry #backoff #tier

6 min read

Sangmin Lee

Jul 7

Anthropic Admin API: Usage, Costs & Workspaces (2026)

#anthropic #usage #billing

5 min read

Sangmin Lee

Jul 7

Vercel AI SDK + Claude: Streaming, Tool Use & Edge Deploy

#streaming #edge #nextjs

5 min read

Sangmin Lee

Jul 7

Prompt Caching: $487 $52 in Real Numbers (2026)

#benchmark #dataset

7 min read

Sangmin Lee

Jul 7

Build an MCP Server in Python with FastAPI (2026 Guide)

#mcp #fastapi #python #claude

4 min read

Sangmin Lee

Jul 6

Claude Sonnet 4.6 vs OpenAI o3: Cost, Latency & Coding Benchmarks

#claude #openai #comparison #benchmark

5 min read

Sangmin Lee

Jul 6

Claude Sonnet 4.6 vs Opus 4.7: When to Pay More for Opus (2026)

#claude #sonnet #opus

4 min read

Sangmin Lee

Jul 6

Claude Code Hooks: 8 Production Patterns (2026)

#hooks #automation #security #productivity

3 min read

Sangmin Lee

Jul 6

Claude API on Bun: 3 Faster Cold Starts (2026)

#bunjs #node #runtime #performance

6 min read

Sangmin Lee

Jul 6

Claude Agent SDK: 5 Subagent Patterns (2026)

#subagents #production #patterns

5 min read

Sangmin Lee

Jul 5

Claude API vision_error (invalid_request_error): 원인과 해결법

#troubleshooting

1 min read

Sangmin Lee

Jul 5

Claude API tool_use_error (invalid_request_error): 원인과 해결법

#troubleshooting

1 min read

Sangmin Lee

Jul 5

Claude API streaming_error (api_error): 원인과 해결법

#troubleshooting

1 min read

Sangmin Lee

Jul 5

Claude API prompt_too_long (invalid_request_error): 원인과 해결법

#troubleshooting

2 min read

Sangmin Lee

Jul 5

Claude API model_not_found (not_found_error): 원인과 해결법

#troubleshooting

2 min read

Sangmin Lee

Jul 4

Claude API max_tokens (invalid_request_error): 원인과 해결법

#troubleshooting

1 min read

Sangmin Lee

Jul 4

Claude API invalid_api_key (authentication_error): 원인과 해결법

#troubleshooting

2 min read

Sangmin Lee

Jul 4

Claude API file_upload_error (invalid_request_error): 원인과 해결법

#troubleshooting

2 min read

Sangmin Lee

Jul 4

Claude API context_length_exceeded (invalid_request_error): 원인과 해결법

#troubleshooting

1 min read

Sangmin Lee

Jul 4

Claude API cache_error (invalid_request_error): 원인과 해결법

#troubleshooting

1 min read

Sangmin Lee

Jul 3

Claude API billing_error (permission_error): 원인과 해결법

#troubleshooting

1 min read

Sangmin Lee

Jul 3

Claude API batch_error (invalid_request_error): 원인과 해결법

#troubleshooting

1 min read

Sangmin Lee

Jul 3

Claude API 529 overloaded_error: 원인과 해결법 (2026)

#troubleshooting

1 min read

Sangmin Lee

Jul 3

Claude API 504 gateway_timeout: 원인과 해결법 (2026)

#troubleshooting

2 min read

Sangmin Lee

Jul 3

Claude API 503 service_unavailable: 원인과 해결법 (2026)

#troubleshooting

1 min read

Sangmin Lee

Jul 2

Claude API 502 bad_gateway: 원인과 해결법 (2026)

#troubleshooting

1 min read

Sangmin Lee

Jul 2

Claude API 500 api_error: 원인과 해결법 (2026)

#troubleshooting

1 min read

Sangmin Lee

Jul 2

Claude API 429 rate_limit_error: 원인과 해결법 (2026)

#troubleshooting

1 min read

Sangmin Lee

Jul 2

Claude API 413 request_too_large: 원인과 해결법 (2026)

#troubleshooting

1 min read

Sangmin Lee

Jul 2

Claude API 404 not_found_error: 원인과 해결법 (2026)

#troubleshooting

1 min read

Sangmin Lee

Jul 1

Claude API 403 permission_error: 원인과 해결법 (2026)

#troubleshooting

2 min read

Sangmin Lee

Jul 1

Claude API 401 authentication_error: 원인과 해결법 (2026)

#troubleshooting

1 min read

Sangmin Lee

Jul 1

Claude API 400 invalid_request_error: 원인과 해결법 (2026)

#troubleshooting

1 min read

Writing Debut