Systems with a job to do.

Each entry names delivery focus and working result. Client details remain anonymous where confidentiality requires it.

Client system / Integration / .NET

Factory-to-Accounting Bridge

Connected production-line signals to accounting workflows.

Delivery focus: Industrial and business-system integration
Working result: Batch runs record automatically instead of being entered twice.

C# / .NETSAP Business OneSCADAMongoDB

Client system / Web app / Next.js

IT Operations Platform

Built helpdesk, asset, network-monitoring, and purchasing workflows.

Delivery focus: Operational web platform
Working result: Role-based access and AI-assisted ticket summaries support daily IT work.

Next.jsPrismaMicrosoft GraphGemini

Client system / Dashboard / React

Nationwide Maintenance Dashboard

Created a management view for multi-site maintenance work.

Delivery focus: Dashboard and reporting delivery
Working result: Work orders, status, reporting, and backup workflows stay visible together.

ReactNode.jsMongoDBGoogle Sheets

Client system / Web app / NestJS

Certification Portal

Delivered a submission, review, and approval portal.

Delivery focus: Role-based workflow platform
Working result: Distinct user roles, queues, and document delivery make approvals traceable.

NestJSNext.jsRBACPlaywright

Client system / Workflow / automation

Forms and Workflow Tool

Replaced paper processes with digital forms and approvals.

Delivery focus: Business process digitization
Working result: Searchable records and integrations replace multi-step paper handling.

Next.jsGoogle DriveMicrosoft GraphAutomation

Client system / Tooling / automation

Equipment Backup Utility

Automated repeatable PLC configuration backups.

Delivery focus: Operational recovery tooling
Working result: Recoverable equipment settings are available before changes or restoration.

PLCSchedulingAutomation

Independent build / AI product / vision

AI-Driven E-Commerce Visuals

Designed a product-image pipeline for e-commerce teams.

Delivery focus: Vision pipeline design
Working result: Background removal, generated variations, and quality control gate delivery.

Prompt engineeringVision modelsQueuesQuality control

Independent build / Blockchain / web

Blockchain E-Voting

Built a tamper-evident voting system.

Delivery focus: Blockchain application build
Working result: Eligibility records, Sepolia anchors, and double-vote protection work together.

SolidityWeb3SupabaseSmart contracts

Independent build / Mobile / Kotlin

Personal Finance App

Developed an offline-first Android budgeting app.

Delivery focus: Mobile product development
Working result: Recurring transactions, category reporting, and local records remain available offline.

KotlinJetpack ComposeRoomHilt

Independent build / Python / finance

Trading and Backtesting System

Created a stock and forex signal-generation engine.

Delivery focus: Python systems build
Working result: Guided setup and multiple strategy workflows support repeatable backtests.

PythonBacktestingCLI

Independent build / Creative / web

Y2K Editorial Booth

Built a retro browser photobooth.

Delivery focus: Interactive web experiment
Working result: Camera effects and editorial-style photo exports are part of one browser experience.

Live demoy2kutie.jason-guijo2160.workers.dev/Open

JavaScriptCanvasWeb

Independent build / AI / cross-platform

Engram Study Coach

Built an AI-powered flashcard app with real spaced repetition.

Delivery focus: Cross-platform learning product
Working result: Study decks work offline, with optional sync and AI-assisted feedback.

ExpoReact NativeCloudflare WorkersFSRS

Independent build / Product / Reflex

Service Hub

Built a booking and invoicing hub for Philippine service businesses.

Delivery focus: Scheduling and billing product
Working result: Public booking, owner operations, issued invoices, and payment state stay in one surface.

Live demotakdora-portfolio.vercel.app/portfolioOpen

ReflexPythonPostgreSQLAlembicPlaywright

Independent build / Tooling / TypeScript

Agent Control Plane

Built a local control plane for agent work with a human confirmation gate.

Delivery focus: Local-first agent runtime
Working result: A request becomes a preview, waits for a confirmation, then queues as an observable task.

Live demoagentic-os-portfolio.vercel.app/Open

TypeScriptNode.jsZodSQL migrations

Independent build / Tooling / QA automation

Policy-Gated QA Agent

Built a QA engine that refuses work outside a declared capability policy.

Delivery focus: Test automation and safety boundary
Working result: Permitted checks run and produce evidence; production, high-load, and mutation requests are rejected before an executor starts.

Live demoqa-agent-portfolio.vercel.app/playwright-demoOpen

TypeScriptPlaywrightaxe-coreZodSARIF