Mobile Apps Development

Web Development

Product Design

IT Consulting

Discover Flutter

There is always exciting technology our team wants to try out. We challenged them and asked for proof on how Flutter can bring value to the client. We are sharing the insights after making the first 10 commercial apps within the last 24 months during which we’ve spent some 17.193,00 hours on Flutter projects.
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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.
Marta Kutyna
Maspex Group
LeanCode has managed to create the great project on time and within budget
Sebastian Zimmermann
The Bike Company
I recommend LeanCode as a responsible tech partner who created our Revelo bikesharing application.
Antoine Azaïs
We are highly satisfied with the cooperation with LeanCode as a trustful tech partner.

Why LeanCode

We care
about your problem
Defining the problem is crucial for further success and designing the solution with the problem in mind.
We know
how to solve it
Our experienced team consists of Product Designers, Analytics, .Net, Flutter, and Frontend 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 of 50 devs, architects, designers, testers and product owners is run by the entrepreneurs
Łukasz Kosman
Co-founder and Partner, 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 can build your next great digital solution!

We start in simple 3 steps

4h long workshop
During 4h 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.

Industries where we excel

Booking services
Smart City

Our experience

We are a 5-STAR business partner

We can build your next successful app!


We build communities

Technology we love

.NET Core

We share knowledge

Firestore and Firebase suite are great technologies. They allow developers to build some features in Flutter and other mobile frameworks really fast. However, Firestore has also many pain points that outweigh the pros in most of the more advanced cases. Is Firestore appropriate for you? Read on to find out why!
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Firestore (and Firebase) is a really great solution for many different use cases. However, there is a number of limitations that make using Firestore painful. Tricky latency, data migration problems, and complicated privacy are just the beginning of troubles. Read the article to find out why!
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It's worth understanding the Firestore limitations and how to overcome them before you start building your next web or mobile application using native or cross-platform solutions like Flutter, React Native, or Kotlin. Read hints on how to use Firestore effectively and not hurt yourself in the process.
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