Languages
- Python
- PHP
- JavaScript
- TypeScript
- Dart
- SQL
Available for work
I build
I build
fast and secure apps that solve real problems
I'm J.R. Bone, a full-stack developer focused on turning business needs into innovative solutions.
- Full-stack applications
- Automation programs
- Fortified by design
05
Projects built
And more on the way
Full-stack
Applications
Web / Mobile / Desktop
CV
Experience & achievements
View résumé
GitHub
Creations
Explore repositories
About Me
Technical depth with practical business support.
I design and build technology solutions—from a wide range of platforms to automation, cybersecurity, virtual operations, backend systems, and custom tools that enhances the quality of work.
My primary focus is application development. Experience with cybersecurity and virtual assistance helps me approach projects with stronger security awareness and attention to operational details.
Primary focus
Applications & Automation
Supporting strengths
Security & Virtual operations
Capabilities
How I Can Help You
From product development to technical support, I bring together the skills needed to move an idea from problem to working solution.
Web Development
Custom websites built for speed, performance, and conversion. I create digital presences that look great and work perfectly.
- Responsive Website Design
- SEO Optimization
- Website Maintenance
Programming
Solving complex problems with clean, efficient code. I build applications and tools to automate your workflows.
- Custom Web Applications
- API Integrations
- Bug Fixing & Troubleshooting
- Multiple Programming Languages
Supporting capability
Virtual Assistance
Reliable administrative support to free up your time. I handle the details so you can focus on the big picture.
- Email & Calendar Management
- Data Entry & Research
- Customer Support
- Project Management
Supporting capability
Cybersecurity
Identify vulnerabilities and improve your security. I perform thorough tests to ensure your systems are protected.
- Web Application Penetration Testing
- Network Security Assessment
- Security Testing Tooling
- Linux (Arch)
Currently Learning
Machine Learning
Build and train models to solve complex problems. I create intelligent systems that learn from data.
- Python & Anaconda
- Machine Learning
- Deep Learning
- Artificial Intelligence
Technologies
The stack behind my projects.
Languages, frameworks, infrastructure, and tools I have used to build the selected work below.
Frameworks
- Flutter
- React
- Flask
- Express.js
- Tailwind CSS
- Material UI
- Tkinter
- Redux Toolkit
Infrastructure
- Linux
- MySQL
- SQLite
- Node.js
- OVHcloud
- Nginx
- Gunicorn
- SSH
Security & Tools
- Git
- GitHub
- JWT
- Argon2id
- bcrypt
- Vite
- Axios
- Librosa
- NumPy
- SciPy
- Pandas
- Matplotlib
- OpenAI API
Case Studies
How each project came together.
Open a project to see the problem it addresses, the approach I took, and the engineering decisions behind the result.
01 LnPulse Read case study Close case study
System Architecture
Request and data flow
Client
React 19
Administrative interface
API
Express 5
RBAC and protected routes
Data access
Sequelize
Models and relationships
Database
MySQL
School information records
Supporting controls
- Formik + Yup validation
- Axios requests
- bcrypt credentials
Challenge
Senior high school administration involves connected student, department, curriculum, user, and academic-term records that become difficult to maintain in separate workflows.
Approach
I designed one authenticated administrative workspace for creating and reviewing student records while managing the academic structures those records depend on.
Engineering decisions
React handles the interface and validated forms, while an Express and Sequelize API organizes MySQL data and bcrypt protects stored credentials.
Outcome
The resulting system gives administrators a consistent workflow for maintaining school records and configuring the active school year and semester.
02 Calcuoke Read case study Close case study
System Architecture
Configuration-to-sale workflow
Client
React + TypeScript
Builder and management UI
Server
Express API
Business and costing logic
Database
MySQL
Inventory, sales, and warranties
Generated outputs
- Customer photo uploads
- Warranty certificates
- Replacement history
Challenge
Building and selling custom karaoke systems requires accurate component costing, stock tracking, customer records, warranties, and replacement history.
Approach
I turned the process into a guided configuration workflow that calculates setup costs and connects each sale to its components, customer, photos, and warranty information.
Engineering decisions
A typed React interface keeps complex forms predictable, while Express and MySQL preserve the relationships among inventory, configurations, sales, and hardware swaps.
Outcome
Calcuoke provides a traceable workflow from initial system assembly through sale, printable warranty generation, and after-sales component replacement.
03 PyPOS Read case study Close case study
System Architecture
Offline desktop workflow
Desktop client
Python + Tkinter
Windows application
Application layer
POS Services
Checkout, stock, and reporting
Local database
SQLite
Offline business data
Local utilities
- Excel import and export
- Backup and restore
- PyInstaller packaging
Challenge
Small retailers need dependable checkout and inventory tools even when internet access is unavailable, without sacrificing reporting, access control, or recoverability.
Approach
I built an offline-first desktop application covering barcode and SKU lookup, cart and payment workflows, stock updates, reports, user management, and audit history.
Engineering decisions
Python and Tkinter provide a lightweight desktop UI, SQLite keeps business data local, and dedicated import, export, backup, and restore tools protect portability.
Outcome
PyPOS packages the daily retail workflow into one installable application that can operate independently of a hosted service.
04 ApplianSys Read case study Close case study
System Architecture
Storefront and operations flow
Storefront
React + Material UI
Redux-managed customer journeys
Backend
Express REST API
Commerce and admin workflows
Database
MySQL
Products, carts, and orders
Connected services
- OpenAI customer support
- Leaflet delivery maps
- ExcelJS + jsPDF exports
Challenge
An appliance storefront must coordinate product discovery, customer accounts, inventory, checkout, fulfillment, order tracking, and administrative reporting.
Approach
I built the customer storefront and REST API as connected journeys, including search, database-backed carts, delivery or pickup, mock GCash payments, and order status.
Engineering decisions
React, Material UI, and Redux Toolkit manage the customer experience; Express and MySQL support role-based admin tools, stock controls, reports, maps, and document exports.
Outcome
The platform connects customer purchasing and internal operations while providing AI-assisted support and a clear administrative view of products, orders, and sales.
05 KaraOK In Development Read case study Close case study
System Architecture
Cross-platform analysis pipeline
Clients
Flutter + PHP Admin
Mobile app and administration
Edge
Nginx + HTTPS
Reverse proxy and TLS
Application server
Gunicorn + Flask
REST API and authentication
Data
MySQL 8
Users, assessments, and audit logs
DSP pipeline
Librosa + SciPy
NumPy, Pandas, and Matplotlib
Communications
SMTP + OTP
Verification and recovery
Security boundary
- JWT access and refresh tokens
- Argon2id password hashing
- Secure on-device storage
Challenge
Karaoke audio quality is difficult to judge consistently because useful measurements such as loudness, noise, and spectral balance are technical and hard to interpret.
Approach
I designed a cross-platform Flutter workflow for recording or selecting audio, submitting it for analysis, and presenting scores, suggestions, waveforms, and spectrograms.
Engineering decisions
A Flask API and MySQL backend support the client, while Librosa, NumPy, SciPy, Pandas, and Matplotlib power the DSP pipeline. JWT, Argon2id, OTP, and secure storage protect access.
Current result
The application can evaluate core audio characteristics and generate visual reports. The mobile experience, administration console, and production deployment continue to be refined.
Selected Works
Projects built to solve real problems.
01
School information system
LnPulse
CompletedAn administrative information system for organizing senior high school student records, departments, curriculum, users, and academic settings.
What I built
Built the authenticated admin workflow for creating and reviewing student records, managing departments and curriculum, administering users, and configuring the active school year and semester.
02
Full-stack karaoke system builder
Calcuoke
CompletedA full-stack karaoke system builder for configuring setups, managing inventory, recording sales, and tracking warranties and replacements.
What I built
Built a karaoke configuration and sales management platform featuring automatic cost calculation, component inventory CRUD, customer records, photo uploads, hardware swap tracking, and printable PDF warranty certificates.
03
Desktop point-of-sale system
PyPOS
CompletedAn offline desktop point-of-sale and inventory management system for small retail businesses.
What I built
Built a complete POS application with secure authentication, barcode and SKU lookup, cart management, multiple payment methods, inventory tracking, sales reports, Excel import and export, database backup and restore, user administration, and audit logging.
04
Full-stack e-commerce platform
ApplianSys
CompletedA full-stack appliance e-commerce platform with product discovery, secure customer accounts, cart and checkout workflows, order tracking, administrative management, reporting, and AI-assisted customer support.
What I built
Built the customer storefront and REST API, including authentication, product search and categories, database-backed carts, delivery and pickup checkout, mock GCash payments, order management, stock controls, sales reports, role-based admin tools, and an AI chatbot.
05
Mobile audio analysis app
KaraOK
In DevelopmentA mobile audio analysis tool that evaluates karaoke sound quality and turns technical measurements into clear scores, visual reports, and recommended audio settings.
What I built
Built the record-and-upload workflow, empirical five-feature grading for loudness, bass, treble, sharpness, and flatness, plus noise and distortion checks, waveform and spectrogram visualizations, saved analyses, and settings suggestions.
Available for new projects
Let’s work together
Ready to get started?
Tell me what you are building, the problem you want to solve, and where you need a developer’s help.
- Full-stack web applications
- Mobile and desktop solutions
- APIs, automation, and secure systems