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

Toy Box Siege

Toy Box Siege

Any Device

Tower Defense

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