Jacobus' Arcade

Engineer · Maker · Builder

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About Me

I'm Jacobus — a senior product engineer who builds systems that make engineering teams dramatically more effective. I design autonomous build workflows, MCP-integrated knowledge tools, and compound engineering practices.

I'm also a follower of Jesus, a father, a husband, and a creative maker who builds games and software for the joy of it.

Jacobus and his family

What Drives Me

My work is grounded in a conviction that building well is an act of stewardship. I follow Jesus, and that shapes how I approach craft, people, and purpose.

What I'm Building

Current engineering projects and open-source work

mustard

Personal knowledge graph — MCP server, CLI, and TUI. SQLite-backed with full-text search and context retrieval via graph traversal.

TypeScript MCP SQLite

View on GitHub →

flow-mo

YAML-source-of-truth diagram editor with VS Code extension. Drag, connect, and edit flowcharts with React Flow.

React VS Code YAML

View on GitHub →

local_lense

Production-ready RAG documentation search tool. Indexes local docs into Qdrant vector DB for semantic search, with MCP integration for Cursor.

TypeScript RAG Qdrant

View on GitHub →

math-practice

Shipped educational math game for kids aged 6-12. Six operation paths with star-based progression and adventure map UI.

React Education Shipped

Play Live Demo →

Build System

Semi-autonomous build loop — spec to shipping with quality gates, automated retrospectives, and regression detection. 44+ documented learnings.

Agentic CI/CD Compound

Read on Blog →

Creative Lab

Games and experiments — where I started, and what I still build for fun

Recent

Jank

Jank

Any Device

Arena Defense

Botanica

Botanica

Any Device

Plant Growth Simulator

Playable Classics

Robo War

Robo War

Desktop

WASD + Mouse Shooter

CuteDefense

CuteDefense

Any Device

Tower Defense Game

The Vault · circa 2015

Hand-coded experiments from when I was first learning to build games. Kept for nostalgia.

Adventure RPG

Adventure RPG

Desktop

TypeScript RPG Framework

AI Behavior

AI Behavior

Desktop

Real-time Strategy with Bot AI

Image Shuffle

Image Shuffle

Any Device

Simple Puzzle Game

Platformer

Platformer

Desktop

Custom Physics Platformer