Aug 24
My resume tool won't rewrite your resume, and that's the feature
Most of the time, my resume tool refuses to rewrite your resume. That is the feature.
5 min read
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
Aug 16
The Metric That Could Only Say 1.0
Two months ago I built a report that told me my system worked. Every pair processed. Nothing unresolved. No failures.
11 min read
Jul 7
When Real Technology Meets Bad Investment
When Real Technology Meets Bad Investment: AI, Railways, Chinese EVs, and the Next Infrastructure Cycle AI is usually discussed in two extreme ways.
11 min read
Jun 10
When Metrics Reward AI Usage Instead of Real Work
Amazon recently shut down an internal AI usage leaderboard called KiroRank after employees reportedly started optimizing for the leaderboard instead…
8 min read
Jun 1
When Prompt Engineering Hits a Ceiling
For the last two weeks I've been stuck on the same bug in ResumeMatch.
7 min read
Apr 3
Layoffs Aren’t Random. Companies Just Can’t Measure Real Value
How performance systems break at scale—and why layoffs become blunt resets I kept seeing layoffs happen and something didn’t add up.
5 min read
Mar 30
Adding a DynamoDB Caching Layer to a Serverless LLM Pipeline
Another late night on Sunday shipping features. This week I added a caching layer to ResumeMatch that drops duplicate analysis latency from 25 seconds…
8 min read
Mar 21
How I Fixed False Negative Keyword Matching in My LLM-Powered Resume Analyzer
Happy Friday! Weekend's almost here, but before I sign off, I wanted to write up a fix I shipped this week for ResumeMatch.
10 min read