Custom Web Apps Built For Real Workloads
Web application development for businesses that need a custom solution. I build full-stack apps with React, Next.js, and Node.js — user authentication, databases, APIs, and deployment included. Based in the Philippines, available worldwide.
Most web apps fail at the edges — complex workflows, multiple roles, real data volumes.
Off-the-shelf platforms and no-code tools handle simple use cases well. The moment your requirements include a non-standard approval workflow, a permission model with more than two roles, or a data grid that needs to load 50,000 rows without freezing — you are fighting the platform instead of building your product.
Hiring an agency often produces a working first version and a codebase no one can maintain. Logic is scattered, there are no tests, and every change request costs three times what it should because the next developer has to reverse-engineer the original decisions.
Purpose-built web applications your team can actually maintain.
I build web applications from the data model up — React frontend, Node.js backend, PostgreSQL database — with clear architecture, documented code, and a test suite that catches regressions before they reach users. Based in Davao City, Philippines (UTC+8), I deliver async-first with full visibility at every milestone.
- Requirements documented and signed off before a single line of code is written
- Live staging environment from week one — test real features before launch
- TypeScript across client and server with shared type definitions
- Role-based access control designed for your specific permission model
- Complete source code in your repository, fully documented at handoff
Web Application Types I Build
Dashboard Apps
Data-rich dashboards with filtered tables, charts, date-range queries, and export capabilities. Queries are optimized with proper indexing so dashboards load in under 200ms even with millions of rows.
Internal Tools
Admin panels and operations software that replace spreadsheets. Role-based permissions, audit trails, bulk data operations, and CSV export built in — designed for non-technical staff to use daily.
Customer Portals
Self-service portals where your customers manage their accounts, view usage data, submit requests, and access documents — without creating a support ticket for every action.
Admin Panels
Internal interfaces for managing users, subscriptions, content, and configuration. Impersonation, activity logs, feature flags, and bulk operations included so your team can support customers without SQL.
Data Visualization
Interactive charts, graphs, and reporting interfaces that turn your database into decisions. Built with Recharts or Chart.js, connected to your PostgreSQL data via optimized API endpoints.
Multi-tenant Apps
Applications that serve multiple organizations from a single deployment — with strict data isolation so tenant A never sees tenant B's records. Row-level security enforced at the database layer.
Systems I Can Build For Your Business
- ❯Dental Management System
- ❯Clinic Appointment Scheduler
- ❯Patient Records System
- ❯Pharmacy Inventory System
- ❯Medical Billing System
- ❯Student Information System
- ❯Online Enrollment System
- ❯Grade & Report Card System
- ❯Library Management System
- ❯E-Learning / LMS Platform
- ❯Simple Inventory System
- ❯Point of Sale (POS) System
- ❯HR & Payroll System
- ❯Purchase Order System
- ❯Expense Tracking System
- ❯Water Refilling Station System
- ❯Laundry Management System
- ❯Rental Management System
- ❯Booking & Reservation System
- ❯Delivery Tracking System
- ❯Barangay Management System
- ❯Resident Records System
- ❯Complaint Ticketing System
- ❯Document Request System
- ❯Event Permit System
- ❯Multi-tenant SaaS Platform
- ❯Internal Dashboard Tool
- ❯Customer Self-Service Portal
- ❯Workflow Automation App
- ❯Any custom system you need
Transparent Pricing, Fixed-Fee Projects
One-time project fee
A focused internal tool, customer portal, or single-purpose data application.
- Up to 8 pages or views
- React or Next.js frontend with responsive layout
- Node.js REST API with documented endpoints
- PostgreSQL database with schema migrations
- JWT authentication with basic role support
- Deployment to Vercel and Railway
- 2 weeks post-launch support
- Full source code ownership
One-time project fee
A multi-role web application with integrations, admin panel, and real-time features.
- Unlimited pages and API routes
- Role-based access control with 3 or more roles
- Third-party integrations (Stripe, S3, email, CRM)
- Admin panel with user and content management
- Real-time features via WebSockets or polling
- Unit and integration test suite
- CI/CD pipeline via GitHub Actions
- AWS or Vercel production deployment
- 30 days post-launch support with weekly check-ins
Scoped per project
High-traffic applications, multi-organization access, or complex workflow systems.
- Everything in Professional
- Multi-tenant data model with organization isolation
- Advanced caching with Redis
- Load testing and performance audit
- Security review and hardening
- Full architecture documentation and ADRs
- Team onboarding sessions
- Retainer option for ongoing development
From Requirements to Running Application
Requirements & Scope
We document exactly what the application must do and agree on measurable acceptance criteria for each feature. This document is signed off before a single line of code is written.
Data Model & API Design
I design the database schema and API contract before touching the frontend. Entity relationships, indexes, and API response shapes are locked in early to prevent costly mid-project changes.
Parallel Frontend and Backend Build
API endpoints are developed alongside React components using mock data. Both layers are integrated and functional on the staging environment by the end of week two.
Integration Testing and Performance
Automated tests cover all API routes and critical user flows. I run database query analysis and add indexes where response times exceed 100ms under realistic data volumes.
Production Deployment and Documentation
Application is deployed to production with environment secrets managed securely. You receive architecture docs, a deployment runbook, and a video walkthrough of the codebase.
Technical Standards On Every Project
TypeScript End-to-End
Shared type definitions between server and client mean API response shape changes surface as compiler errors — not runtime crashes at 2am. The entire codebase is type-safe by default.
Query Performance from Day One
Every database query is analyzed with EXPLAIN ANALYZE during development. Indexes are added before launch, not after users report slowness on a page with 100,000 rows.
Accessible UI Components
All interactive components meet WCAG 2.1 AA standards. Keyboard navigation, ARIA labels, and focus management are built in — not audited and patched after launch.
Environment Parity
Local, staging, and production environments run identical configurations. Works on my machine bugs do not make it to production because they were never possible in the first place.
Security Defaults
CORS configuration, rate limiting, input sanitization, parameterized queries, and HTTPS-only cookies are applied to every project as baseline requirements — not optional extras.
Async-First Delivery
Based in Davao City, Philippines (UTC+8). Daily written updates and a shared project board keep US, AU, and EU clients informed without requiring synchronous meetings outside business hours.
Web Applications Shipped and Running
"We replaced a tangled spreadsheet system with a custom portal Johnbert built in four weeks. Our team adopted it immediately because it was designed around their actual workflow, not a generic template."
"The codebase he delivered is the cleanest I have seen from an external developer. Typed throughout, tests for every endpoint, and a README that actually explains the architecture. We onboarded two engineers in a day."
"Working across timezones was never a problem. Daily status updates, a live staging URL I could share with stakeholders, and no surprises on delivery day. Will work with Johnbert again on the next project."
Web Application Development, Answered
Common questions about this service
Johnbert Oñez
AI Solutions Engineer & Full Stack Developer · 6+ yrs · 50+ projects
Based in Davao City, Philippines. Specialises in production AI systems, full-stack web applications, and WordPress. Remote-first, async-friendly, fixed-fee projects.
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AI systems, SaaS platforms, WordPress solutions — whatever the scope, I bring craftsmanship and precision from day one.