About Jiajun

Jiajun Liang
Jiajun Liang

I'm Jiajun Liang, a QA engineer who thinks in systems. I use reports to document what I learn about software, markets, and slow travel.

Background

  • 3+ years testing engineering and networking at Fortinet across LDAP, Kerberos, and HTTP/2/3.
  • Built automation with Python, Ansible, and CI pipelines to keep services observable.
  • Carry reliability thinking into how I allocate time, capital, and attention.

Currently

  • Shipping testing infrastructure with AI copilots to surface signals quickly.
  • Tuning experiments in trading strategies, writing cadence, and mental models.
  • Writing notes in English and Chinese to make sense of systems versus what just sounds good.

Why I write

I share working notes to learn in public, meet fellow systems thinkers, and stay honest about what the data shows.

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