Architecture → Software

Full Stack Developer

I ship production software solo, then write down exactly where I was wrong.

SaaS products, AI systems, and visualization tools, from database schema to production deployment.

King Joshua Marcos
Build snapshot

13 projects shipped·4 full write-ups·1 live SaaS with billing integrated

King Joshua Marcos
About

I own the whole stack, which changes what you have to build in.

I write TypeScript and Next.js for a living, and GDScript when I'm making a game instead. On everything below, I was the only engineer, the only designer, and the only QA, so the verification had to be built into the work instead of into a reviewer. So a lot of what I've actually gotten better at isn't a framework or a language, it's noticing when I'm wrong before someone else has to.

That shows up as a habit more than a skill: write down the traps that cost real time, measure instead of assume, and say what I checked and how, rather than what I believe should be true. The case studies are mostly about the times that habit was missing and what it cost, and the one time it caught something before it shipped.

Web stack

What I actually build with

Shipped in the work below

Claude Code Ships the github-repo-hygiene-skill as a Claude Code skill. See the case study →
Next.js Framework behind ModlyAI in production and Holdfast in early access. See the case study →
React Powers every Next.js project below, ModlyAI and Holdfast included. See the case study →
TypeScript 46,710 lines of TS/TSX in ModlyAI alone. See the case study →
InstantDB ModlyAI's database, merchant dashboard included. See the case study →
Vercel modlyai.tech runs in production here. See the case study →

Daily tools

Claude
Cursor
Codex
Cloudflare
Canva
Photoshop
Premiere Pro
AutoCAD
SketchUp
Revit
Work

Everything I've shipped

Thirteen projects, four with a full write-up — the rest are finished and real, just without a story attached. No team or reviewers, so the interesting part is usually the bug I found after I thought it was done.

Featured work

Other builds

Case study

github-repo-hygiene-skill

A Claude Code skill that audits every repo on a GitHub account for a missing description, topics, license, or a README that's still scaffold text, then fixes what you approve.

16 repos audited: 11 clean, 5 with a gap, 8 issues.

ShellGitHub CLIClaude Code skill

SaaS Analytics Dashboard

Self-hosted, multi-tenant analytics platform: a tracking script plus a dashboard of visitor statistics, no third party involved.

Next.jsSQLite

AI Interior Design Assistant

Upload a room photo and a style, get back a concept, a color palette, and furniture suggestions for that specific room.

Next.jsComputer vision

skillsmith

Turns anything into a Claude Skill: an interview-driven generator that drafts, validates, and packages it.

TypeScriptCLI

Also on GitHub

AI Website Audit, Freelancer Proposal Generator, PDF to Structured Data, Client Brief Generator, What Should I Build?, Screenshot to Website

Contact

Let's build
something.

If you're hiring, evaluating a project, or want to build something together, I'd love to hear from you.