# JQZ — Kai Jiang (Kai, @jqz_dev)

> I’m Kai (Kai Jiang, @jqz_dev), a solo developer building Vaneform, MeetNewAI and EarlyLore. My products, plus first-hand notes on shipping, ops and indie launches.

jqzdev.com is the personal site of Kai (Kai Jiang), a solo developer who goes by JQZ online. English pages live at /, Chinese pages at /zh. The author byline is "Kai".

## Person
- Name: Kai Jiang (Kai, JQZ)
- X: https://x.com/jqz_dev
- YouTube: https://www.youtube.com/@jqz_dev (channel "Kai Jiang")
- GitHub: https://github.com/jiangqizheng

## Products
- [Vaneform](https://vaneform.com/): Understand a website from one domain. See a website’s traffic and search visibility.
- [MeetNewAI](https://meetnewai.com/): Find AI tools by the job. AI tools, AI games, and MCP servers, sorted by what you need done.
- [EarlyLore](https://earlylore.com/): SaaS ideas worth validating. Research real products, revenue signals, and competitor changes before you build.

Internal tools Kai built to run these products (private, sign-in only, not public products): Bay (production ops console), Hop (outbound connection lease service), pfauth (sign-in and identity service at auth.jqzdev.com).

## Writing (English)
- [Cloudflare was blocking GPTBot and ClaudeBot on my site. How I found it and turned it off](https://jqzdev.com/blog/cloudflare-blocking-ai-crawlers): My personal site returned 403 to GPTBot, ClaudeBot and CCBot while robots.txt allowed everything. The cause was a Cloudflare zone setting. How to test for it with curl, the fix, and why I cache AI crawlers instead of blocking them.
- [My nightly pgBackRest backup made Postgres slow. A memory ceiling helped more than an I/O cap](https://jqzdev.com/blog/pgbackrest-backup-slowing-postgres): Disk was 13–23% busy and CPU mostly idle, yet page loads hit 28.8 s during backups. The cause was page cache eviction. How I ran pgBackRest under systemd-run with MemoryHigh and an I/O cap on a Pigsty host, with before/after numbers.
- [Free backlink directories that actually worked for my indie launches (October 2026)](https://jqzdev.com/blog/free-backlink-directories-indie-launch): Notes from about 200 directory submissions for three solo-built products: which free directories went live with a dofollow link, how long review took, and the traps (fake dofollow emails, last-step badge demands, expiring free tiers).
- [A solo developer’s launch checklist: day 0 to week 4](https://jqzdev.com/blog/solo-developer-launch-checklist): The launch checklist I now reuse for every product I build alone: technical SEO before day 1, where to post and how often, what got my X account locked, and what to check in week 4. Built from real launches, with the failures kept in.

## Writing (中文)
- [Cloudflare 一直在拦 GPTBot 和 ClaudeBot：我怎么发现的，又怎么关掉的](https://jqzdev.com/zh/blog/cloudflare-blocking-ai-crawlers): 我的个人站 robots.txt 全部放行，GPTBot、ClaudeBot、CCBot 却拿到 403。原因是 Cloudflare 的一个 zone 设置。用 curl 自查的方法、修复步骤，以及我为什么选择缓存 AI 爬虫、不去屏蔽它们。
- [pgBackRest 夜间备份拖慢了 Postgres：内存上限比 I/O 限速更管用](https://jqzdev.com/zh/blog/pgbackrest-backup-slowing-postgres): 备份期间磁盘只有 13–23% 繁忙、CPU 大部分空闲，页面却慢到 28.8 秒。原因是 page cache 被挤掉。我在 Pigsty 主机上用 systemd-run 给 pgBackRest 加 MemoryHigh 和读带宽上限的过程，附前后对比数据。
- [独立开发上线：真正有用的免费外链目录（2026 年 10 月实测）](https://jqzdev.com/zh/blog/free-backlink-directories-indie-launch): 一个人给三个产品提交了约 200 次目录后的记录：哪些免费目录真的上线并给 dofollow、审核要多久，以及常见的坑（邮件说 dofollow 实际 nofollow、最后一步才要求回链、免费档会过期）。
- [独立开发者的上线清单：从上线前一天到第四周](https://jqzdev.com/zh/blog/solo-developer-launch-checklist): 我一个人做产品时每次都复用的上线清单：第一天之前要做好的技术 SEO、去哪里发、发多频繁、什么操作让我的 X 账号被锁，以及第四周该复盘什么。来自真实的上线过程，失败的部分也保留了。

## Other pages
- [Home](https://jqzdev.com) / [中文首页](https://jqzdev.com/zh)
- [All writing](https://jqzdev.com/blog) / [全部文章](https://jqzdev.com/zh/blog)
- [Brand kit](https://jqzdev.com/brand)
- [Sitemap](https://jqzdev.com/sitemap.xml)