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.

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My resume tool won't rewrite your resume, and that's the featureAugust 24, 2026
Adding a DynamoDB Caching Layer to a Serverless LLM PipelineMarch 30, 2026
How I Fixed False Negative Keyword Matching in My LLM-Powered Resume AnalyzerMarch 21, 2026
When Prompt Engineering Hits a CeilingJune 1, 2026

2 posts

Jun 1

When Prompt Engineering Hits a CeilingJun 1 · 7 min read

For the last two weeks I've been stuck on the same bug in ResumeMatch.

7 min read

Mar 21

How I Fixed False Negative Keyword Matching in My LLM-Powered Resume AnalyzerMar 21 · 10 min read

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

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