Open Source Portfolio

I build practical open-source tools for concurrency, security, and developer productivity. These summaries are recruiter and hiring manager friendly. Each card links to code and detailed write-ups.

Recent highlights include Recent highlights include JCoroutines (structured concurrency for Java 21+, published on Maven Central), ShellGuard (SSH security layer for AI-assisted workflows), and SheafGate (a pattern for running SvelteKit/Bun as a desktop app without Electron).

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Open Source Projects

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JCoroutines

Structured concurrency for plain Java

Virtual Threads arrived in Java 21 but structured concurrency remained in preview. JCoroutines fills that gap with clean, production-ready APIs.

Technologies: Java, Concurrency, Structured Concurrency, Testing

GitHub · Maven Central

ABCoroutines

Structured concurrency for Kotlin on Java 21

Bridges Kotlin coroutines to the Java 21 virtual thread model with clean, idiomatic structured concurrency primitives.

Technologies: Kotlin, Concurrency, Structured Concurrency, Java 21

GitHub · Maven Central

NotNull4J

Runtime null-safety at trust boundaries

Extends JSpecify with runtime null enforcement at external boundaries — APIs, databases, deserialised payloads — where static analysis can’t reach.

Technologies: Java, Security

GitHub · Maven Central

Sandcastle Auth

Spring Boot auth server with token governance

A lightweight authorization server with scoped tokens, configurable expiry, and centralised role syncing. No vendor lock-in.

Technologies: Java, Kotlin, Spring Boot, JWT, Security

GitHub

SheafGate

SvelteKit/Bun as a desktop app — without Electron

A Go binary that spawns a Bun/SvelteKit server on an ephemeral port with UUID auth, giving a full desktop app feel with zero Electron overhead.

Technologies: Go, SvelteKit, Bun, TypeScript, Security, Desktop

GitHub

SheafJournal

Local-first developer journal and PKM

A desktop PKM built on SheafGate. Markdown, Mermaid diagrams, full-text search, frontmatter tags, and a journal-style todo system — all local, all fast.

Technologies: TypeScript, SvelteKit, Bun, Desktop

GitHub

ShellGuard

SSH proxy for AI agent shell access mediation

Sits between an AI agent and the shell, mediating access with configurable allow/deny rules and a full audit trail.

Technologies: Security, AI, DevOps, Kotlin, Spring Boot

VerZanctuary

Safe code snapshots before AI edits

Creates named snapshots of your working state before handing off to an AI agent, so you can always compare, restore, and roll back cleanly.

Technologies: Kotlin, CLI, Developer Tools, AI

GitHub

Robokeyboard

Hardware-software automation bridge

An Arduino-based programmable keyboard — firmware in C++ as an Arduino sketch — communicating via serial to a Kotlin control app.

Technologies: Arduino, Kotlin, Automation, Desktop, Hardware

GitHub

RoboKeyTags

Structured comment system for AI agent communication

A structured comment convention letting developers annotate code with machine-readable context — constraints, ownership, risk level — for AI agent consumption.

Technologies: AI, Developer Tools, Kotlin

GitHub

Puzzlegrep

Structured search for code, not just text

A TypeScript CLI that matches meaningful code structures across repositories — not just strings. Speeds up refactors and cross-repo audits.

Technologies: TypeScript, Node.js, CLI, Search, Developer Tools

GitHub

Music Rhythm Timing

Rhythm training app for musicians

A Jetpack Compose Android app with Redux/MVI architecture that teaches rhythmic timing through interaction. Released GPL-3.0 for F-Droid.

Technologies: Android, Kotlin, Jetpack Compose

GitHub