Álvaro Rumpel · Developer · Game master · Inspired

Custom software, built with care.

Mobile apps and web systems by ACR Tech. One person handles everything, from the first call to delivery.You talk directly to me, from first contact to delivery.

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Start a project See work ↓ Enter the dungeon →

I work mainly with Flutter and the web. In production today: herd management, AI-assisted study for law students, spaced repetition for the ENEM exam and an NBA career game. ACR Tech is my company: I quote, build and deliver.

Selected work
Campaign 012026

Anotus

Second brain for law students. Photograph a handwritten note, a whiteboard or a slide. The AI transcribes it, organizes it into Markdown, suggests the relevant legislation and turns it into spaced-repetition flashcards. It has semantic search and exports to PDF and DOCX.

Flutter WebSupabaseAI
See the encounter
Problem
Law students pile up photos of whiteboards and notebooks they never review. It is gone before the exam.
Solution
The AI transcribes and organizes into Markdown with the relevant law beside it. Spaced-repetition flashcards bring it back at the right time.
Anotus interface
Campaign 022026

Campeio

Herd management for cattle vets and farmers. Reproductive history (fixed-time AI, pregnancy checks), immutable health records, expenses per paddock, Excel in and out, role-based access across several farms.

FlutterSupabaseB2B
See the encounter
Problem
Herd history lives in notebooks and spreadsheets with no trace of who changed what. Several vets across several farms make it worse.
Solution
Immutable health records, fixed-time AI and pregnancy per animal, expenses per paddock. Role-based access on each farm.
Campeio interface
Campaign 032026

Revisaflow

Spaced repetition for students preparing for ENEM, the Brazilian university entrance exam. Tick what you studied today and it schedules the next review based on the forgetting curve. You don't need a timer or a control notebook. Freemium with card and Pix billing.

ReactCloudflare WorkersStripe
See the encounter
Problem
ENEM students review what they like and forget the rest. Tracking it by hand becomes one more subject.
Solution
Tick what you studied today and the app schedules the review on the forgetting curve. Freemium with card and Pix.
Revisaflow interface
Campaign 042026

The GOAT

NBA career game that runs in the browser. Steal attributes from legends during the draft, each pick with a cost, then play up to two decades in a 30-team league with awards, trades and playoffs. At the end, a verdict on your legacy.

ReactTypeScriptGame
See the encounter
Problem
A good career game needs an install, hours of setup and a strong PC.
Solution
Runs in the browser. Draft with a cost per stolen attribute, two decades of simulated league with trades and playoffs, a verdict at the end.
The GOAT interface

How I work

Deadline HP 100 / 100
  1. Turn 01

    Conversation

    I understand the idea, the audience and the problem to solve.

  2. Turn 02

    Proposal

    Clear scope, timeline and budget before starting.

  3. Turn 03

    Development

    Partial deliveries so you can follow closely.

  4. Turn 04

    Delivery & evolution

    Store publishing and ongoing support.

Character sheet

Name
Álvaro Rumpel
Class
Developer / Game master
Level
6
Alignment
Lawful Good
XP: days with commits in the last 12 months
  • 18+4STRFlutter
  • 15+2DEXReact / TS
  • 16+3CONSupabase / Postgres
  • 14+2INTAI
  • 13+1WISCloudflare
  • 20+5CHAWhatsApp

Inventory

Flutter

Legendary · +3 on cross-platform deliveries · Equipped since 2020

Dart

Rare · +2 against null · Equipped since 2020

React

Rare · +2 on vanishing components · Equipped since 2021

TypeScript

Rare · +2 against undefined · Equipped since 2021

Supabase

Rare · +3 on RLS · Equipped since 2023

Firebase

Common · +1 on push · Equipped since 2020

PostgreSQL

Rare · +2 on indexes · Equipped since 2022

Cloudflare

Common · +1 at the edge · Equipped since 2024

Node.js

Common · +1 on build scripts · Equipped since 2021

Stripe

Common · +1 on billing · Equipped since 2025

Build the quest

Type
Extras
10DC · Expected roll: 2 to 3 months Send quest on WhatsApp

Summon
the GM.

WhatsApp · +55 55 99985-7941 alvaroRumpel@gmail.com