Staff Software Engineer
Jayson Virissimo is a Staff Software Engineer at SUBSCRIBE, where he's helping build the operating system for the alternative investments industry. He works primarily in Ruby on Rails, with TypeScript, React, and GraphQL across the stack. Outside of work he builds learning tools grounded in spaced repetition — most recently Altkata, a native iOS and macOS app. He lives in Arizona.
A native iOS and macOS app for learning alternative investments through spaced repetition (FSRS): 1,478 exercises across 50 topics, with instant answer verification, hands-free audio review, and a local-first, privacy-respecting design.
A browser-based platform for practicing 22 classic algorithm problems by making the tests pass in JavaScript, Python, or Ruby — running Ruby and Python entirely client-side via WebAssembly (ruby.wasm and Pyodide).
An interactive tool for building digital logic from NAND gates up to a complete Arithmetic Logic Unit, following the Nand2Tetris curriculum. Write real HDL in the browser with live verification, SVG circuit diagrams, and progressive hints.
A Ruby gem that turns your ActiveRecord models into smart flashcards. Add has_deck to a model and get spaced-repetition scheduling — from the classic Leitner system to the modern FSRS algorithm.
A Ruby gem that converts Latin text into phonetic spellings and IPA lexicons so text-to-speech engines (like AWS Polly) can authentically pronounce medieval Latin.