Web apps and customer portals
Logins, dashboards, orders, and documents your clients can see.
Good fit when customers keep emailing for information a portal could show them.
Gabriel J. CantresSoftware engineer in Puerto Rico
Software shaped around how your business works.
Web apps, customer portals, booking and intake systems, integrations, and automation, for teams that have outgrown spreadsheets and copy-paste.
- Written quote before any work starts
- A preview link for every change
- You own the repository and the accounts
- AI-assisted, engineer-reviewed
What I build
Five kinds of project I take on, and when each one makes sense.
Booking and intake systems
Appointments, forms, waitlists and reminders that land in your tools.
Good fit when scheduling happens over phone calls and direct messages.
Integrations and APIs
Connect your website, payments, accounting, Odoo and other apps so data moves on its own.
Good fit when the same order is typed into three systems.
Internal tools and dashboards
Admin panels and reports your team actually uses.
Good fit when the real system is a spreadsheet only one person understands.
AI and automation
Document processing, data entry, summaries, routing, and assistants that answer from your own data, with a human in the loop where it matters.
Good fit when someone spends hours each week moving information around.
How I build
A few habits that keep projects predictable.
A written plan before code
You see the scope, the order of work and the price before I write anything.
Small releases
Every change gets a preview link, so you see progress and can steer early.
A maintainable stack
React, TypeScript, Python and PostgreSQL: mainstream tools that any developer can pick up later.
You own it
The repository, the accounts and the domain are in your name.
A documented handover
You get notes on how it works and how to run it, so you are never stuck depending on me.
Honest advice
If an off-the-shelf tool is the better buy, I'll tell you.
How pricing works
Written quote per phase; small changes $60/hr.
Example projects
Client case studies are on the way. Until then, these labeled examples show the kind of problem I solve and how I'd approach it.
- Example
Admin dashboard for a small online shop
- The problem
- Orders, stock counts and customer messages spread across a spreadsheet and three inboxes.
- How I'd approach it
- A private web dashboard where you see new orders, update stock and track what has shipped.
- What you'd get
- One place to run the day, with nothing retyped.
- Web app
- Dashboard
- Example
Booking and reminders for a service business
- The problem
- Appointments arranged by phone and direct message, with double bookings and no-shows.
- How I'd approach it
- An online booking page with available times, confirmation emails and reminders, plus a simple calendar view for you.
- What you'd get
- Clients book on their own, and you see the day at a glance.
- Booking
- Web app
- Automation
- Example
Website orders flowing into the books
- The problem
- The same order typed into the website admin, the accounting tool and a shipping form.
- How I'd approach it
- An integration that passes each order to the other systems automatically, with a log of anything that needs attention.
- What you'd get
- Each order is entered once.
- Integration
- API
- Automation
Software questions
Can you work with my existing system?
Yes. I can extend or connect what you already have, or tell you honestly when something new would serve you better.
Who hosts it, and what does it cost to run?
I favor free and low-cost hosting plans, set up in your name, so you aren't tied to me. The proposal lists the running costs before you commit.
What about my customers’ data?
It lives in your accounts, not mine. I work only with the access you give me, and I don't keep copies after the job.
Do you use AI to write code?
Yes, as a tool. It helps me move faster and keep costs down. I design the system, then review and test everything before it ships.
Tell me what you're building.
Send a few lines about your business and what you need. I'll reply by email to set up a call.
Prefer to email directly?
gabrieljcantres@gmail.com