Joshua DiniegaFull-Stack Software Engineer
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Full-Stack Software Engineer · Hilongos, Leyte, Philippines

I build things because I want them to exist.

I build and maintain US production systems on contract (realtime, cross-platform, authorization) and teach ICT in Leyte. What I'm best at is joining a codebase someone else started and driving a production defect to root cause. Everything below runs. Open the demos, read the source.

Available for freelance & contract work — React / Next.js · Laravel · Java · MySQL · APIs · Bug fixes

Open Scargithub.com/lumen202
  • Remote · UTC+8
  • Proven US-overlap hours
  • Live demos, public code

Approach

Why I build

Most of these started outside a job description. One was a problem I kept hitting, one was an idea I liked enough to finish, one was a gift, and one was me wanting the course I teach in a single place I control. The engineering came second.

Scar
I started the habit: write down every bug you diagnose. After a thousand-odd records the archive had gone write-only, and I kept hitting problems it already had the answer to.
Mnemo
An idea, not a problem I was living with. I liked it enough to keep going until it was a finished application.
Book of Us
I wanted to build something for a special someone. They became its one real user, and every round after the first came from what they asked for.
Java Course Hub
Convenience, plainly. I wanted the course I teach — lessons, practice, turn-ins — in one place I control instead of spread across four different tools.

Projects

Things I have built

Every one of these opens in a click. None of them can reach real data, and that's enforced by how they were built, not by me promising to be careful.

Systems design and enforcement infrastructure

Scar

Agents can find your code. This turns what already went wrong into checks that run.

  • Node (ESM CLI pipeline)
  • Model Context Protocol
  • BM25 ranking
  • ONNX Runtime Web (int8 MiniLM encoder)
Case studyLive site

A loose idea taken to a finished product

Mnemo

An AI study companion that boots from a fresh clone with no environment at all.

  • Next.js 15 (App Router)
  • React 19
  • TypeScript (strict)
  • Supabase (Postgres + Auth)
Case studyLive demoSource

A product built around one real user

Book of Us

A private app I built as a gift, then kept building from its one user's feedback. You can walk through all of it; the memories in there just aren't the real ones.

  • Next.js 16 (App Router)
  • React 19
  • TypeScript (strict)
  • Tailwind v4
Case studyLive demoSource

Software for real users, in daily use

Java Course Hub

The platform my ICT class runs on. Students practise SQL right in the browser, and the demo sets up a classroom for you to try.

  • Next.js 16 (App Router)
  • React 19
  • TypeScript (strict)
  • Tailwind v4
Case studyLive demoSource

Experience

Where I have worked

Two US contracts and a classroom. Clients described, not named.

  • May 2026 – present

    Full-stack engineer, cross-platform (contract)

    A scheduling and booking platform (US)

    Two codebases at once: a legacy React Native app and the monorepo replacing it, shipping to iOS, Android and web from one source. I own delivery on the areas below. It's subcontracted work: a primary contractor holds the client relationship, not me.

    • React Native + Expoone codebase → iOS, Android, web
    • tRPCAPI-wide object-level authorization audit
  • Jul – Nov 2025

    Full-stack engineer, realtime & reporting (contract)

    A home-care operations platform (US)

    Owned the realtime layer and a reporting subsystem on a Laravel, Vue 3 and PostgreSQL platform dating back to 2022. I owned delivery on the areas below. Subcontracted again: a primary contractor held the client relationship, not me.

    • Laravelbroadcasting, policies, reporting subsystem
    • WebSocketstenant-scoped authenticated channels
  • Nov 2025 – present

    Programming Instructor

    Provincial Government of Leyte — E2P Program

    I completed this program in 2024–25, then the province hired me to teach its advanced cohort. I also built the platform the class runs on.

    • Curriculum designa 5-month, 100-session Java program
    • Teachingdaily technical instruction to beginners
What I owned on each

Freelance & contract

What I can help with

  • Fix bugs in existing web applications
  • Add features to React / Next.js applications
  • Add real-time features — live updates, WebSockets
  • Build reporting dashboards with PDF and Excel export
  • Add AI features to an existing product — retrieval, generation
  • Add test coverage to an untested codebase