I’m Sebastian Sejzer.

I’m a systems engineer, technology leader, and founder based in Israel. I work across infrastructure, security, automation, and product development.

My career has taken me through enterprise IT, cloud platforms, security engineering, and team leadership. Alongside that work, I build my own products and businesses.

What I work on

I design and operate systems, automate repetitive work, and help teams make their infrastructure more reliable and manageable. That can mean cloud and Kubernetes environments, identity and access, deployment pipelines, monitoring, or the everyday IT operations that keep a company moving.

Selected experience

Magma Devs · IT Manager and Infra Team Lead

Led a distributed IT and DevOps team across US and EU time zones. Worked on hybrid Kubernetes infrastructure, identity and endpoint security, deployment pipelines, and monitoring, supporting SOC 2 and ISO 27001 certification efforts.

UBS · Associate Director / Senior Cyber Security Automation Engineer

Built Python integrations and automation for IBM Security SOAR, improved GitLab pipelines, and led internal security workshops. Earned UBS Certified Engineer Gold recognition.

MyHeritage · Senior IT Systems Administrator

Managed critical corporate IT platforms and automated monitoring and operational processes across a mixed infrastructure environment.

Earlier work

At NoX90, I worked on containerization, Azure Kubernetes Service, and secure delivery pipelines. At Kaltura and Gamytech, I managed virtualization, networks, and cloud infrastructure. Earlier roles included IBM and Hewlett-Packard, as well as founding and running an IT outsourcing company in Argentina.

What I’m building now

I’m now bringing that experience into REX5 and my own software products. You can explore the full collection on my Work page.

Outside the job title

I speak English, Spanish, and Hebrew. I write here about technology, engineering, and the ideas that catch my attention.