About

Cybersecurity and infrastructure engineer based in Miami, Florida, with 35 years of IT experience in the public and private sector across enterprise networking, security operations, and systems engineering. Founder of IT Solutions USA. Background spans telecom signaling (SS7), IBM i and Oracle RAC administration, virtualization, and the move into modern network automation and applied cybersecurity — including SENTINEL, a self-operated autonomous defense platform built on Zero Trust and post-quantum cryptography (FIPS 203/204).

This site is where the work gets written down: long-form technical articles, plain-language security awareness guides, a working curriculum on data science, and certification study notes as they're worked through. Everything here is written to be used, not just read. Where there's code, it runs.

The range is deliberate, not scattered. Staying multidisciplinary keeps the mind sharp the same way cross-training keeps a body capable — the reason this site covers routing protocols alongside risk frameworks. It's the same instinct that shows up on the judo mat: rank aside, every session starts from a white belt's attention.

Projects and code: GitHub. Contact: john@konstas.us.

What's here

• Articles — networking, cybersecurity, cryptography, and automation, current for 2026.
• Security Awareness — practical, no-nonsense online-safety guides for everyone, drawn from years of front-line security work.
• Data Science — a ten-part practitioner's curriculum, from the modern Python stack through LLMs and MLOps.
• Information Security — CCIE Enterprise Infrastructure and CISSP study blueprints and domain review notes, updated as each domain gets covered.