Wenhao HeBlog
Writing24 posts · Since 2025

Notes on systems, LLMs, and the industry building them.

I'm Wenhao, a software engineer. I write up system design problems I've worked through, what I'm learning about LLMs, notes from shipping side projects like ResumeMatch, and the occasional take on layoffs and where the industry is heading.

Pinned
  1. My resume tool won't rewrite your resume, and that's the feature
  2. Adding a DynamoDB Caching Layer to a Serverless LLM Pipeline
  3. How I Fixed False Negative Keyword Matching in My LLM-Powered Resume Analyzer
  4. When Prompt Engineering Hits a Ceiling
Tagged1 post
Jul 12
Key Concepts in System DesignJul 12 · 4 min read

Understanding core system design concepts is crucial for building scalable, performant, and reliable software systems.

4 min read
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