Software, security, systems, music.

Robert Ryan Jennings

Web logs of a software development engineer, musician, artist and hockey player.

Essays on software engineering, mobile and backend security, architecture, older systems, and the occasional adjacent obsession.

Content expressed is my own and does not reflect the opinions of any entity.

Featured Essay

Anthesis Update: Memory, Governance, and Beyond the SDLC

View all posts

Browse the Archive

Explore by Topic

All categories

Popular Categories

all categories

Latest Entries

Recent Writing

Browse all posts

Designing Secure Authentication Systems

Mar 20, 2026 12:00AM
16 min read
3392 words
Designing Secure Authentication Systems
A practical reference for designing authentication systems that can withstand compromise, replay, abuse, and operational failure.

Quiet Presence: A Personal Reason for Building a Controlled Booking System

Mar 20, 2026 12:00AM
18 min read
3808 words
Quiet Presence: A Personal Reason for Building a Controlled Booking System
Why I built Quiet Presence, and how I used a small Cloudflare stack plus AI-assisted development to create a provider-controlled booking system with clear client preferences.