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System Developer in Tayug, Pangasinan

Justin AngeloVillacorta

I build systems end to end — mobile, web, and the API in between.

I take software projects from requirements and system design through development, deployment, and production support. I’m comfortable owning the full development lifecycle and staying involved after launch to improve, maintain, and scale the solution. Open to contract work and full-time opportunities.

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projects built
13
client engagements
4
live to visit
2
certifications
5

Thirteen projects, two of them open to visit

From a Wordle clone in 2023 to a blockchain marketplace running today. Four were paid client work; every one was built end to end. Open any tile for the full write-up.

live2026

FreelanceXchain

Capstone project

A freelance marketplace where the escrow is a smart contract.

  • Milestone escrow in Solidity 0.8.26, funded upfront and released on approval
  • AI skill matching and proposal drafting on a self-hosted Ollama model
  • Skill-gap analysis against a freelancer’s verified portfolio
  • Didit KYC identity verification for both sides of a contract
  • On-chain reputation that stays with the freelancer, not the platform
Next.jsTypeScriptExpressNode.jsAppwriteSolidityHardhatethers.jsPolygonOllama

Read it, then open the site

Payroll PH

2026

Philippine payroll, computed and filed without a spreadsheet.

  • SSS, PhilHealth, Pag-IBIG, and withholding tax computed per cutoff
  • Multi-company management for accounting firms handling several payrolls
FlutterDartSupabasePostgreSQLBLoC

Read the case study

Field Inspection Pro

2026

Inspections assigned by location, signed off on site.

  • Five-role access model enforced in Firestore security rules
  • Multi-stage inspection pipeline with location-based smart assignment
FlutterNext.jsTypeScriptFirebaseFirestore

Read the case study

Learner Tracker

2026

Attendance, conduct, and commendations in one student record.

  • Daily attendance tracking across classes and year levels
  • Violation monitoring with severity classification
ReactTypeScriptNode.jsExpressSupabase

Read the case study

Quotio

live2025

Pricing and quotes for accounting practices, with the scope built in.

  • Reusable pricing templates with a minimum price per engagement
  • Up to four service levels presented side by side for comparison
ReactTypeScriptNode.jsExpressMongoDBStripe

Read it, then open the site

Cryphoria

2025

Accountancy where the ledger currency is crypto.

FlutterReactDjango+3

Read the case study

Boardmate

2025

Boarding house management both sides can see.

ReactNode.jsExpress+1

Read the case study

RaceConnect

2025

A social network built for motorsports fans.

KotlinJetpack ComposePHP+1

Read the case study

TechInfo

2024

PC building guidance with the troubleshooting attached.

KotlinLaravelPHP+1

Read the case study

Typeroo

2024

Guess the obscured word before the clock runs out.

Java

Read the case study

Legendary Motorsport

2024

A showroom for luxury supercars and sports bikes.

HTMLCSSJavaScript

Read the case study

Tic-Tac-Toe

2024

Tic-tac-toe, drawn and played in pygame.

PythonPygame

Read the case study

Wordle Clone

2023

A Wordle clone, and the first thing I ever built.

FlutterDart

Read the case study

Certified in AWS and applied AI

Five certificates from 2026 — two courses, two hackathons, and a community conference. Open any of them to see the original document.

AWS AI Practitioner Challenge

Udacity, part of Accenture

June 26, 2026

AWS Fundamentals

Zuitt Learning Institute

May 21, 2026

IBM Bob Hackathon

lablab.ai, part of NativelyAI

May 15–17, 2026

Build with AI 2026

Google Developer Groups Baguio

May 9, 2026

Meet At: AI Con X

AWS User Group Pangasinan

April 11, 2026

What I build with

Grouped by the job each tool does rather than by how well I know it — everything listed has shipped in one of the systems above.

Languages7
TypeScriptJavaScriptPythonDartJavaKotlinSolidity
Frameworks7
Next.jsReactFlutterNode.jsExpressFastAPIDjango
Databases6
PostgreSQLSupabaseMongoDBFirebaseAppwriteMySQL
Blockchain5
Hardhatethers.jsPolygonMetaMaskGanache
AI tooling8
OllamaClaudeCodexCursorKiroGeminiIBM BOBAntigravity
Deployment and tooling10
AWSVercelRenderDockerHerokuGitGitHubPostmanSwaggerStripe

How it went

From a Wordle clone in 2023 to client systems running in production, with the workshops and hackathons that pushed each step.

  • shipped
  • certified
  • attended

2026

  1. shipped

    FreelanceXchain

    Capstone project — live at freelancexchain.works

    A freelance marketplace where the escrow is a smart contract.

  2. shipped

    Payroll PH

    Client engagement

    Philippine payroll, computed and filed without a spreadsheet.

  3. shipped

    Field Inspection Pro

    Client engagement

    Inspections assigned by location, signed off on site.

  4. shipped

    Learner Tracker

    Client engagement

    Attendance, conduct, and commendations in one student record.

  5. certified

    AWS AI Practitioner Challenge

    Udacity, part of Accenture

    Verified certificate awarded June 26.

  6. certified

    AWS Fundamentals, 27-hour elective

    Zuitt Learning Institute

    EC2, DynamoDB, S3, Lambda, API Gateway, and serverless deployment.

  7. attended

    Code & Conquer: Understanding Blockchain

    System Developer Alliance Workshop, PHINMA UPang

    The Sui ecosystem, the Move language, and smart contract development.

  8. attended

    Advancing the New Era of Agentic Coding

    PHINMA UPang CITE Tech Summit

    Agentic development workflows using Google Antigravity.

  9. attended

    IBM Bob Hackathon

    lablab.ai

    Built and submitted an AI/ML solution over a three-day build.

  10. attended

    Build with AI: multi-agent systems

    GDG Baguio, University of the Cordilleras

    Deploying multi-agent systems with ADK and Agent Engine.

  11. attended

    EGOVPH Hackathon

    SMX Convention Center, SM Aura, Taguig

    Built civic-technology solutions for Philippine government services.

  12. attended

    Meet At: AI Con X

    AWS User Group Pangasinan

    Community conference on applied AI and cloud architecture.

2025

  1. shipped

    Quotio

    Client engagement — live at quotio.app

    Pricing and quotes for accounting practices, with the scope built in.

  2. shipped

    Cryphoria

    PHINMA University of Pangasinan

    Accountancy where the ledger currency is crypto.

  3. shipped

    Boardmate

    PHINMA University of Pangasinan

    Boarding house management both sides can see.

  4. shipped

    RaceConnect

    PHINMA University of Pangasinan

    A social network built for motorsports fans.

2024

  1. shipped

    TechInfo

    PHINMA University of Pangasinan

    PC building guidance with the troubleshooting attached.

  2. shipped

    Typeroo

    PHINMA University of Pangasinan

    Guess the obscured word before the clock runs out.

  3. shipped

    Legendary Motorsport

    PHINMA University of Pangasinan

    A showroom for luxury supercars and sports bikes.

  4. shipped

    Tic-Tac-Toe

    PHINMA University of Pangasinan

    Tic-tac-toe, drawn and played in pygame.

2023

  1. shipped

    Wordle Clone

    PHINMA University of Pangasinan

    A Wordle clone, and the first thing I ever built.

Let’s build something

Tell me what you need and I’ll tell you honestly whether I’m the right person to build it.

This opens the message in your own mail app, filled in and ready. You send it, so you keep a copy.

email
progamerx1017@gmail.com
github
JustinVillacorta
phone
+63 939 530 8249
based in
Tayug, Pangasinan, Philippines
Download resume