Mar Cabrera
.NET & React · 11 yrs · Messy business logic → clean code.
New to Contra
Mar is ready for their next project!
A client needed a system where her students could book classes, pay online, and manage their schedules — and she needed to run the whole business from one place.
I built it alone, start to finish. Teachers see their calendar, students pick a class and pay, the studio owner sees everything. Automated reminders, payment tracking, cancellation handling — all working, all live.
One developer. One platform. Running in production.
Next.js 15 · React 19 · TypeScript · Prisma · Supabase · PostgreSQL
1
67
I built a tool that reviews an entire software project and finds every bug, security hole, and problem — automatically.
On its first run, it found 60+ issues in a live application, including ways an attacker could access other users' data. Then it fixed them, one by one, and verified nothing broke.
Think of it as hiring a senior developer to inspect every corner of your code — except it takes minutes, not weeks.
Claude Code · Python · Security Automation
1
56
A 36-unit apartment building in Buenos Aires needed to stop chasing residents for payments over WhatsApp.
I built a system that automatically sends each resident their expenses, what they owe, and when it's due. Clear numbers, on time, no phone calls.
The building administrators went from spending hours every month on this to spending zero.
Python · Django · Gmail API · PostgreSQL
1
56
I needed a better way to find and manage freelance clients. Nothing out there fit, so I built my own.
It tracks every lead, every proposal, every follow-up. Then I added an AI assistant that searches job boards for me, finds the ones that match what I do, and puts them in my queue.
It runs 24/7 and costs nothing. I open it in the morning and the opportunities are already there.
Next.js · TypeScript · PostgreSQL · Ollama · Python
2
47