I build software and the systems behind it.
I’m Sebastian Sejzer, a systems engineer, technology leader, and founder. My work spans cloud infrastructure, security, automation, and the software people use every day.
Today, I’m building REX5 and independent software products. Hitechist is where I share that work and write about what I learn along the way.
What I’m working on
My current focus is REX5, helping remote agencies manage access and IT operations. Alongside it, I build software for clinic teams, monitoring, and desktop productivity.
Experience behind the work
My background includes leading distributed IT and DevOps teams, building security automations at UBS, and managing corporate systems at MyHeritage.
Writing
Notes on infrastructure, security, software, and the people building it. Practical lessons, technical curiosity, and the occasional strong opinion.
Let’s talk
Have a product, infrastructure, or automation challenge? Tell me what you’re working on.