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
Tagged3 posts
Aug 16
The Metric That Could Only Say 1.0Aug 16 · 11 min read

Two months ago I built a report that told me my system worked. Every pair processed. Nothing unresolved. No failures.

11 min read
Jun 10
When Metrics Reward AI Usage Instead of Real WorkJun 10 · 8 min read

Amazon recently shut down an internal AI usage leaderboard called KiroRank after employees reportedly started optimizing for the leaderboard instead…

8 min read
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