sankler

Sankler Bergman · software developer in Brazil

Software for the operations of small and mid-sized businesses.

Deliveries, field service and sales, with a web dashboard, a mobile app and Pix payments (Brazil's instant payment system). Before writing any code, I gather what people complain about on Reclame Aqui (Brazil's largest consumer complaint site), in forums and in competitor reviews. Every feature answers one of those pain points.

Read the case study Get in touch
Delivery dispatch dashboard: live map of Cuiabá with drivers and deliveries, next to the list of orders waiting for a driver
Logística Local & Rotas dashboard with fictitious data in Cuiabá, Brazil. The interface is in Portuguese.

Projects

What is already live or in use.

Pilot in production · v1.5.0

Logística Local & Rotas

Last-mile delivery for carriers and retailers in Mato Grosso, Brazil. It connects, in real time, the dispatcher, the driver and the customer.

  • Customer PIN and proof of delivery with photo, GPS and signature, against “marked as delivered, but I never got it”.
  • Live tracking link, ready to send over WhatsApp.
  • Multi-stop route planning with vehicle load limits.
  • Pix following the Central Bank standard, and a wallet for self-employed (MEI) drivers.
  • Node.js
  • Next.js
  • React Native
  • Socket.io
  • Prisma
Read the case study →

Private code. Screenshots use fictitious data.

Three phone screens: order tracking with the confirmation PIN, the driver's list of stops, and the MEI wallet with balance and annual cap
LiveOpen source

Scanner Doc

Photos, Word files or PDFs become a PDF right in the browser: automatic paper cropping, merging, splitting and compressing. No upload, no sign-up, no tracking, and it works offline.

  • JavaScript
  • Offline PWA
  • Canvas
  • Node test
Open the app → View the code
Scanner Doc home screen: a button to choose photos, PDFs or Word files, and the promise that nothing leaves the device
In development

EmpilhaBurguer

Casual Android game: stack the burger ingredients with the right timing, with levels, a 60-second mode and a zen mode.

  • Kotlin
  • Jetpack Compose
  • Canvas 2D

How I work

From the problem to the shipped release, with every decision on record.

  1. Pain points with sources

    I research what bothers the people who will use the product, with sources, and record each pain point with a priority. That record becomes the backlog.

  2. Specification

    I define clear acceptance criteria before building.

  3. Tests

    Automated tests, including security and role-based permission tests.

  4. Delivery

    Numbered releases, with migrations rehearsed on a copy of the database, backups and post-release checks.

Tech stack

  • TypeScript
  • React
  • Next.js
  • React Native/Expo
  • Node.js
  • Express
  • Prisma
  • PostgreSQL
  • SQLite
  • Socket.io
  • Java 21
  • Kotlin/Jetpack Compose
  • Python
  • Playwright
  • Docker
  • Linux
  • Oracle Cloud

Does your operation run on WhatsApp and spreadsheets?

Tell me how it works today. I'll show you the systems running and help you figure out what to solve first.

contato@sankler.com.br Message me on LinkedIn View GitHub