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We help our clients to bring their product vision from zero to one

Underpromise & Overdeliver have been our long-term values while delivering web and mobile applications.

About us

LeanCode is a software house from Warsaw, Poland, that started its journey of developing mobile and web applications in 2016.

Since then, we have grown and become a team of 60+ skilled professionals whose mission is to solve real-life problems using cutting-edge technologies.

LeanCode builds digital products for corporations and startups in the US, Europe, and Australia. We offer Mobile App Development and Web App Development services.

We focus on developing applications in the three leading technologies: Flutter, .NET, and React, and we can confidently call ourselves experts.

We also share our expertise in the form of IT Consulting, Product Design Workshops, Mobile App Audits, Automated UI testing, and Staff Augmentation.

We always emphasize the quality of our work and the culture of support and feedback to our clients and employees.

Thanks to this approach, we have gained the trust of many clients and have been expanding our portfolio of projects for the Banking, Fintech, Well-being, Logistics, MedTech, and SportTech industries.

LeanCode was ranked in the Deloitte Fast50 contest in 2021 for CEE's quickest-growing IT companies, recognized as one of Europe's Fastest Growing Companies 2023 in the Financial Times 1000 Ranking, and awarded in the Forbes Diamonds 2023 and 2024 Ranking.

At LeanCode, we are heavily engaged in building communities and spreading knowledge. We have been the organizers of the world's biggest Flutter conference, Flutter Europe, in Warsaw, Poland, and the largest meetup in Europe dedicated to Flutter - Flutter Warsaw that gathers over 1.8K members worldwide today.

We build our own frameworks (i.e., Patrol) and solutions, contribute to open-source projects, have our custom Internship Program, and give lectures at several universities in Warsaw, Poland. We are also an official Flutter consultancy firm.

We build our frameworks, contribute to open-source projects, have our custom Internship Program, and give lectures at several universities in Warsaw, Poland. We are also an official Flutter consultancy firm.


leading technologies
years of experience
Flutter Warsaw meetups
professionals on board
projects delivered

History of LeanCode

Łukasz Kosman and Jakub Wojtczak established LeanCode, and at first, the team consisted of only 6 people. Today we’re much bigger and deliver apps to clients worldwide.

  • 2024

    - Received Forbes Diamond Award 2024 and was listed in the Gazele Biznesu and the Financial Times 1000 ranking.

    - Organized the Flutter Warsaw #18 event.

  • 2023

    - Received Forbes Diamond Award 2023 and was listed in the Financial Times 1000 ranking.

    - Released the “Mobile Banking in Poland 2022” Report.

    - Released the "Flutter for Enterprise" White Paper.

    - Organized an event dedicated to mobile banking called "Technology Breakfast."

    - Speakers at 11 European Flutter-related events, including Fluttercon, Flutter&Friends, and Flutter Firebase Festival.

  • 2022

    - Released the “Building Mobile Banking App with Flutter” eBook.

    - Speakers at Flutter Vikings and Mobile Trends Conference.

    - Released Patrol, our Flutter-first and open-source UI testing framework.

    - Organized the Flutter Warsaw #17 event dedicated to Flutter in Banking.

  • 2021

    - Ranked in the Deloitte Fast50 contest for CEE.

    - LeanCode welcomed the 40th employee on board.

    - Started to teach the "Flutter mobile applications” at Warsaw University of Technology.

Core Values

Growth icon


The constant development of skills and knowledge is one of our priorities. This also applies to the approach to company development - we want it to be a platform for the growth of each of LeanCode's team members.

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We evaluate the needs of the project and our capabilities in detail. We don’t make empty promises, and our experts openly share feedback with clients and the team. This integrity results in delivering great apps.

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Open mind

We believe that the focus can help us to become experts in global leaders in our three leading technologies: Flutter, .NET, and React. Yet, this does not stop us from experimenting with other solutions. We’re always open to new challenges and technologies.

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At LeanCode, we strongly believe that the success of the client's project is the success of the team. That is why each of us is willingly involved in solving the encountered challenges and searching for the best solutions.

Our News

Meet LeanCode and Our Speakers at Fluttercon Berlin 2023

LeanCode became the Silver Sponsor of this year's most-expected event, Fluttercon Berlin 2023. But it's not all! You can also meet there 4 our speakers who will share their knowledge with other great developers from around the world based on enterprise Flutter projects they delivered at LeanCode.
Meet LeanCode and Our Speakers at Fluttercon Berlin 2023

The Technology Breakfast 2023 by LeanCode - Conclusions You Shouldn’t Miss

Polish banking is in a demanding but also interesting moment of change. LeanCode organized the Technology Breakfast event, gathering banking, fintech, and technology Experts together to discuss the present and the future of mobile banking. Learn about key conclusions from the event.
Premiere of the Report on Mobile Banking by LeanCode

Flutter Banking Apps - Summary of Flutter Warsaw #17

Is Flutter an enterprise-ready technology? Doubts were dispelled during the "Flutter Warsaw #17 - Flutter in Banking" event organized in late June 2022 by LeanCode. Read our summary of the event and watch the video recordings to get more knowledge.
Flutter Warsaw#17 event

How We 10x Improved Flutter UI Testing With Patrol 2.0

Discover the potential of Flutter UI testing and the enhancements brought by Patrol 2.0. Find out how our dev team achieved a remarkable 10x improvement in the efficiency and reliability o UI tests, unleashing streamlined testing workflows. Dive into the article and improve your Flutter UI testing process.
Patrol UI Testing Framework by LeanCode

We have been featured

Forbes logo
"Credit Agricole Bank Polska has decided to become one of the leaders in digital banking. Their new application, "CA24 Mobile", provides access to a full range of functions, the implementation of which was responsible, among others. LeanCode company specializing in Flutter technology."
Fintek logo
"Mobile banking is an indispensable element of the business strategy of banks. They need to develop their new online product offer to meet customer expectations. We interviewed Łukasz Kosman about the challenges and the importance of technology in banking during “Flutter Warsaw #17: Flutter in Banking."

Flutter Warsaw Community

LeanCode has been a part of the Flutter Community from the very beginning, and out of a passion for this technology, in 2018, we initiated the Flutter Warsaw Community. 

Over the years, it became one of the largest meetups dedicated to Flutter in Europe, with over 1.9K members worldwide.

We have wanted to create a space where all Flutter enthusiasts can learn from each other and listen to keynotes on cases that can help them improve their mobile app development.

So far, we have organized 18 Flutter Warsaw events, the last of which gathered around 120 participants offline. Some past editions were also live-streamed to make the event accessible to all.

We are proud to host many well-known speakers in the Flutter Community on the Flutter Warsaw stage. Their talks are still available to the public on the Flutter Warsaw YouTube channel.

Our goal is to contribute to the development of Flutter technology and engage others in this journey.

Flutter Warsaw logo

Photos from the event

Photo from Flutter Warsaw 1
Photo from Flutter Warsaw 2
Photo from Flutter Warsaw 3

Other initiatives

Patrol Framework

LeanCode Day

Flutter Europe

Inspiring Academy

LeanCode Internship

LNCD icon
Patrol Framework

LeanCode has created Patrol – a Flutter-first UI testing framework that revolutionizes the way we test our Flutter apps. Patrol is written in Dart, which makes it familiar to all Flutter developers. Our team is working on its further development.

Explore our know-how

Flutter CTO Report 2024

Flutter CTO Report 2024

This report offers a comprehensive summary of insights and opinions on Flutter from CTOs, CIOs and Tech Leads, based on their experience with various Flutter projects.
The "Flutter for Enterprise" White Paper

Flutter for Enterprise

Based on the experience from large-scale projects with more than 20 Flutter Devs, we summarized best practices for building enterprise applications in Flutter.
The "Banking Apps with Flutter" Ebook

Building Mobile Banking Apps with Flutter

This ebook is packed with technical and organizational details about delivering the "CA24 Mobile" banking application with Flutter.

Core technologies

Other technologies

Node.js logo
TypeScript icon
Kubernetes icon
AWS icon
Google Cloud icon
Google Cloud
Microsoft Azure icon
Microsoft Azure

App examples

Case Study of Credit Agricole Bank Polska App
Credit Agricole Bank Polska logo
Mobile Application

Credit Agricole Bank Polska

Case Study of Mindy App
Mindy logo
Mobile Application


Case Study of Prospector App
Prospector logo
Web Application


Awards & Badges

Deloitte Technology Fast50 Badge
Banking Technology Forum Badge
Top Developers Badge
Diamond Award Forbes
Diamond Award Forbes 2024
Financial Times 1000
Clutch 100 badge
Gazele Biznesu 2023

Our team