Ambare-e EV Charging App Case Study

Client Overview

Ambare-e built out this whole EV charging network across Brazil such as home chargers, apartment setups, public stations at malls and cafes. Hardware was there. Infrastructure was in place.

But drivers were charging blind. No app to check their session, no way to see if charging started, nothing. Just plug in and hope. We built the missing piece, an app that gives people actual control.

Key Challenges

The primary challenges faced by the client included:

Drivers Had Zero Control

You plug in your EV and walk away. Is it charging? Who knows. How much battery gained? No clue. When will it finish? Complete mystery. No app, no dashboard, nothing. Drivers were totally in the dark.

Connections Kept Dropping

Ambare-e built custom firmware for their chargers, which meant no standardized protocol. Getting the app and hardware to communicate reliably was brutal. Connections dropped randomly - sometimes it worked, sometimes it didn't.

Three Charger Types, Different Rules

Home chargers work differently than apartment ones, which work differently than public mall chargers. Each type needed its own access rules, pricing, and permissions. One app had to handle all three smoothly.

Our Solution

We worked with Ambare-e's firmware team to build what drivers actually needed.

Flexible Connections

Standing by your car? Bluetooth works. Inside grabbing coffee? WiFi handles remote starts. We gave people both options.
Walk up to a public charger, scan the code, you're connected. No menus, no settings.
AWS IoT Core with MQTT creates a real-time link between app and the chargers. Drivers see power draw, time elapsed, progress to full charge, everything as it happens.
Got WiFi? Start charging from the restaurant. Need to stop early? Hit stop from the app. No more walking back and forth.
Every charge gets logged, such as when, where, charger type, and cost. People use this to track monthly EV expenses.

Payments and Setup

Pay for public charging right in the app. Simple and secure.
Own a charger? Customize it however you want.
Public chargers charge per session. Semi-public ones in apartment buildings? Monthly rates. The app handles both without confusing anyone.
Every payment gets a receipt. Date, time, location, cost. Everything you'd need for expense reports or just tracking your spending.
Got a charger in your apartment building? Set up who can use it without giving everyone your login. Residents get access, random people don't.
Some drivers charge overnight when electricity's cheaper. Set a schedule once, the app remembers. Your car charges when rates drop.

Finding Chargers

See nearby chargers on a map, such as way easier than scrolling through addresses.
Real-time availability, pricing, and compatibility. No outdated info.
Only want to see fast chargers? Filter for those. Need public ones only? Done. The app shows you what you're actually looking for.
Each charger shows how far away it is. Battery at 15%? You'll see which ones you can actually reach.
Use the same charger near work every day? Save it. No searching every time - just tap your favorites and go.
Found your charger? Hit navigate and it opens in your maps app. No copying addresses or switching back and forth.

Tech Stack

Flutter

The App Itself

Backend Infrastructure

Cloud Stuff

Cloud Database

Connection Methods

Handling Money

What Makes Us The Buzz of Tech Town

They didn’t just build what we asked for—they offered suggestions that improved the final product

VT Netzwelt delivered a stable and well-designed app that worked seamlessly across stores. The team implemented every feature with great attention to detail and was flexible, responsive, and proactive. Their clear communication and commitment to understanding the client's needs stood out.

Anonymous

Founder & CEO, Home Decor Retailer

They have very well-structured teams and processes.

VT Netzwelt has successfully launched a new website for the client, much to their delight. The team is highly organized and receptive to feedback, and internal stakeholders are particularly impressed with the service provider's vast technical knowledge.

Aga Strzelecka

Ecommerce Project Manager, EZ Living Furniture

They always delivered projects on time and responded to our needs.

VT Netzwelt launched the client's B2B web platform, immediately impacting revenue. The team provided timely deliverables and was responsive to the client's needs. VT Netzwelt's business and technical acumen were the project's hallmarks. The client was satisfied with VT Netzwelt's performance.

Richard BenBassett

VP DTC & B2B, Petmate

"I rest easy knowing that I have VT Netzwelt backing me up."

In addition to strengthening the overall quality of the mobile apps, VT Netzwelt has grown to assume the responsibility of maintaining and updating the products. With a wealth of valuable development experience, they have proven to be a reliable vendor that strives to provide standout service.

Anonymous

Owner, Meal Planning Service

…we share a high level of trust. If they tell me something should be done a certain way, I follow their advice.

VT Netzwelt provides accurate quotes and time estimates, allowing internal teams to better plan for new features. The team is reliable and has cultivated a strong, trusting relationship throughout the engagement. Transparency and regular communication are hallmarks of their work.

Florian Metz

Managing Director, MeineSpielzeugkiste

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How We Built Brazil’s Driver App for Electric Vehicle Charging?

Client Overview

Key Challenges

Our Solution

Flexible Connections

Payments and Setup

Finding Chargers

Strong App Store visibility

People Just Got It

Remote Updates Changed the Game

Visibility Built Trust

Built to Grow

They've Got Real Feedback Now

No More Charger Hunt

Tech Stack