FullStack Labs

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Hire our Elite Flutter Developers

FullStack Labs is a leading team of Flutter developers, engineers, programmers, coders, and architects. Uber, Siemens, and hundreds of other companies have chosen us for their mission-critical Flutter development projects.

Hire Our Elite flutter Developers Now
What's included

We’ll review your code base and provide a report that includes quality scores for the following:

  • Test suite and test coverage
  • Code quality, including a CodeClimate report
  • How soon can FullStack start on my project?
  • Dependencies
  • Error and performance monitoring
  • Documentation
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Trusted By:
UberSiemensEricssonNFIBEkso BionicsCalifornia

A Few of Our Flutter Developers

Ricardo Berdejo
Ricardo Berdejo
Senior Software Engineer
Flutter Developer
  • Location icon
    Barranquilla, Colombia
  • Education icon
    BS, Computer Science, Fundación Universitaria San Martín, Colombia
  • Star icon
    Years of Experience
Christian Suárez
Christian Suárez
Senior Software Engineer
Flutter Developer
  • Location icon
    Quito, Ecuador
  • Education icon
    Masters, Software Engineering and Informatics Systems, Rioja International University
  • Star icon
    Years of Experience
Waldo Marais
Waldo Marais
Senior Software Engineer
Flutter Developer
  • Location icon
    Panama City, Panama
  • Education icon
    JCSE, University of the Witwatersrand
  • Star icon
    Years of Experience
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Client Testimonials

We really appreciate FullStack’s expertise, and understanding of best practices, for React.js. Their team really is working at the bleeding edge of the technology. After implementing their recommendations we’ve been able to increase automation and decrease labor by 50% in our AR department, freeing up our people for more productive uses.

It’s not easy to get 5 stars from me but you guys have been great! You show up on time, you finish within the schedule. We’re doing accounting and financial systems which means that you have to learn the business side of it. It’s not only software, you have to understand the workflow. Our experience has been amazing.

- George Grant -
Director of IT, The Coding Network

Working with FullStack Labs (Gisselle and Charly) has been one of, if not THE, best work experiences I’ve had in my life - and I’ve built a lot of stuff in my 70+ years.

- Bill Estberg -
President, chill-n-go

Engagement Models for Flutter Projects

New Flutter Apps

We design and build greenfield apps of all shapes and sizes using Flutter combined with a Python, Node, or Ruby on Rails backend.

Existing Flutter Apps

Have a legacy Flutter app? We’re here to help. From debugging and maintenance to feature development and DevOps, we'll tailor a development plan to meet your needs.

Flutter Team Augmentation

Need to add a Flutter developer to your existing team? We'll seamlessly integrate as many developers as needed, to help you go faster and level up your team's skills.

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How to Hire Flutter Developers Through FullStack Labs

  • 1. Talk to us!

    We will work with you to understand your technical needs, team dynamics, and goals.

  • 2. Meet our available talent

    We’ll send you FullStack Flutter developers that match your technical requirements, with links to their FullStack profile page which outlines their work experience and technical abilities, as well as their FullStack technical summary page, which includes a 60 minute video of the developer completing FullStack’s coding challenge, and a plethora of other technical information from their interview with us.

  • 3. 14 Day Risk-free trial

    Start the engagement. Work with your new Flutter developers for a trial period, ensuring they're the right fit.

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FullStack Labs is proudly remote.

We have an ever growing team of incredible people currently located in these countries.
Meet our Leadership Team
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Meet our Leadership Team

Our Clients Love Us, And You Will Too.

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Let's Talk!

We’d love to learn more about your project.
Engagements start at $75,000.

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Essential Technical Flutter Interview Questions

FullStack Labs is a leading team of software developers, engineers, programmers, coders, and architects. Uber, Siemens, and hundreds of other companies have chosen us for their mission-critical software development projects. Flutter is a crucial tool to develop your project, here are a few Flutter Interview Questions you can use to screen your Flutter candidates:

Q: There is a text-overflow on some narrow devices. How would you fix this?
class MyWidget extends StatelessWidget {
  final personNextToMe = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc tincidunt ornare massa, eu dapibus lectus. Morbi quis nisi quis velit imperdiet iaculis.';
  Widget build(BuildContext context) {
    return Row(children: [


When a Row’s child is wrapped in an Expanded widget, the Row won’t let this child define its own width anymore.

Instead, it defines the Expanded width according to the other children, and only then the Expanded widget forces the original child to have the Expanded width.

In other words, once you use Expanded, the original child’s width becomes irrelevant and is ignored.

  children: <Widget>[
      child: Text(
        'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc tincidunt ornare massa, eu dapibus lectus. Morbi quis nisi quis velit imperdiet iaculis.',


Q: What are extensions, and how do we create one?


Extension methods make it possible to add new functionalities to any type, even those from the foundation.

They were introduced in Dart 2.7 and are already available to use in Flutter as well.

extension NumberParsing on String {
    int parseInt() {
        return int.parse(this);

var v = '2';
print(v.parseInt()); // Output: 2

Q: What is a ‘Future’ in Dart?


A future represents the result of an asynchronous operation, and can have two states: uncompleted or completed.

A future of type Future<T> completes with a value of type T. For example, a future with type Future<String> produces a string value.

If the asynchronous operation performed by the function fails for any reason, the future completes with an error.

Future<void> fetchUserOrder() {
  // Imagine that this function is fetching user info from another service or database.
  return Future.delayed(Duration(seconds: 2), () => print('Large Latte'));

void main() {
  print('Fetching user order...');

Q: What widget is typically used to provide safe area support?



Q: What is null-safety introduced in Flutter 2.0?


When you opt into null safety, types in your code are non-nullable by default, meaning that variables can’t contain null unless you say they can. With null safety, your runtime null-dereference errors turn into edit-time analysis errors.

Q: What are the available web renderers we can currently use?


When running and building apps for the web, you can choose between two different renderers. The two renderers are: HTML renderer. Uses a combination of HTML elements, CSS, Canvas elements, and SVG elements. This renderer has a smaller download size.CanvasKit renderer. This renderer is fully consistent with Flutter mobile and desktop, has faster performance with higher widget density, but adds about 2MB in download size.

Q: Which method is used to cancel the animations and unsubscribe stream?



Note: The dispose method is called when the State object is removed, which is permanent.