Custom Software Development From Warsaw

Mobile App Development

Web Development

Product Design

IT Consulting

Discover Flutter

Flutter is loved by many for its simple and fast development of high-quality cross-platform apps. Let’s take a closer look if Flutter is a suitable solution in every case, i.e., when developing mobile, web, and desktop applications.
Is Flutter good for app development?
The number of banks that have opted for Flutter is growing. Specialists from three banks interviewed - Nubank, ING Silesian Bank, and Credit Agricole Bank Polska - rated Flutter as a 9 (out of 10 point scale). Find out if Flutter really is the right solution for building banking apps.
Flutter in banking

Technologies we love


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Business Partners

Agnieszka Marevné-Waniel
Shell Commercial Lead
I enjoy working with LeanCode and the technological expertise they bring to our cooperation. I was impressed with their knowledge, commitment, and how they went beyond the agreed level of support.
Marta Kutyna Bakalarska
Head of Innovation at Maspex Group
LeanCode has managed to create the great project on time and within the budget estimated. The team effectively managed the project using an agile methodology.
Tomasz Czerwiński
Deputy CIO at Credit Agricole Bank Polska
LeanCode has delivered the MVP within 2.5 months, exceeding our expectations. Agile and detail-oriented, they've taken the time to understand the banking industry to deliver the most effective solution for our users. They are professional, efficient, and responsive.
Brent Jackson
Owner, IRD Group
The team not only delivered what we needed, but they improved on what we wanted as well. The new platform is a significant advantage to our sales. I have worked with many IT teams developing software for over 30 years. This team is top grade.

Why LeanCode

We care
about your problem
Defining the problem is crucial for further success and designing the solution. That's why our software is costumed to your needs.
We know
how to solve it
Our experienced team from Warsaw consists of Product Designers, Testers, .Net, Flutter, and React Developers who can prepare the right solution.
We understand
why it matters
With the proper business mindset, we can create meaningful recommendations that fit your real business needs.

You can trust us

Our team, located in Warsaw, Poland and remote, of 60+ Devs, Architects, Designers, Testers, and Product Owners is run by entrepreneurs.
Łukasz Kosman
Co-founder & CEO at LeanCode, formerly CEO at, Founder of Rebel and Appetiq, lecturer at MBA and WUT and mentor at startups.
Jakub Wojtczak
Co-founder and Partner, CTO. Experienced entrepreneur. Co-founder at Appetiq, Rebel. Community activist and co-founder at Flutter Warsaw and Flutter Europe.

We start in 3 simple steps in Warsaw or remotely

Product Design Workshops
4h long workshop
During the workshop we analyze the problem, assess solution and create the product roadmap.
Proof of Concept
Within next 3 days we prepare the technical proof of concept to check if it fits business.
After the POC is accomplished we prepare the recommendation on how to implement the product with the offer.
App Development Process

We will find the best solution for your product!


Industries where we excel

Booking services

Get Expert's knowledge on Mobile Banking!

We are a 5 STAR business partner from Warsaw


We can build your next successful app!


We build communities

A photo from Flutter Warsaw event
Flutter Warsaw is an IT community focused on modern Flutter technology. It is one of the largest so-called meetups dedicated to Flutter in Europe, initiated by LeanCode in 2018 in Warsaw, Poland with over 1.8k members worldwide. It gathers Flutter enthusiasts and other IT professionals interested in getting to know its possibilities.
A photo from Flutter Europe conference
Flutter Europe is an initiative driven by European Flutter Communities to gather people passionate about Flutter and those who want to learn how to create beautiful applications. Its last edition, one of the biggest Flutter conferences, took place in 2020 in Warsaw, Poland. It was organized to share Flutter's knowledge further.

We share knowledge

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
The first stable version of Patrol – a powerful, open-source UI testing framework for Flutter apps is out there, waiting for you to use it. Today, we put the “1.0” sticker on it. Find out how Patrol was born, our vision for it, what we improved, and what it is capable of now.
Testing Flutter Apps Patrol 1.0
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

We are hiring!

No match for you?
Send us your resume. We constantly look for new IT talent that can join us in Warsaw or remotely. Send an email to (click to show)