Hey, I'm Josiah (dezmathio)

Senior Software Engineer specializing in Ruby on Rails, Python, and AI-powered SaaS.
I build scalable, production-grade systems that blend practicality with creativity — from daily tracking apps to AI summarization tools, and many more.

Current Projects

• chewsr -- Rails 8 / Hotwire ~ group session tinder-style restaurant picker

• Conan Exiles x GeoGuessr Fan-made geoguessr clone for Conan Exiles, also in TS.

• Conan ~ Age of The Terminal Fan-made terminal based game about Conan, meant as a learning project for TypeScript.

• err.day – Rails 8 ~ app for tracking nutrition, habits, and sleep cycles with macro goals and gamified feedback loops.

• YTC – Chrome extension + Rails 8 backend for summarizing YouTube transcripts using LLM APIs, with Stripe-based paid tiers. (backend deprecated, low usage)

• Delta Force Map Tracker – static site that displays dynamic rotation schedules in real time (accounting for dst).

• Internal Utilities – Redis workers, background job orchestration, Fly.io deployment automation, Rails-native agent integration experiments, daily commute scripts, etc.

Tech Stack

Languages: Ruby, Python, JavaScript, SQL
Frameworks: Rails 8, Turbo/Hotwire, Stimulus
Infrastructure: Docker, Fly.io, Redis, Sidekiq, PostgreSQL
APIs & Tools: Stripe, OpenAI, GitHub Actions, Cursor, tmux, WSL,

Focus Areas

• AI-native SaaS product development
• Efficient, observable backend architecture
• Rails 8 performance optimization & background jobs
• LLM-assisted developer tooling

prior companies

• USNews & World Report ~ Health
• WeddingWire x TKWW ~ B2C
• Poppir Inc. ~ B2B
• eOriginal

Connect

LinkedIn
X
dezmathio@gmail.com

“We’ve never been closer to dreaming an idea into existence than today.”