Our code run all around the world!

Many years of active presence in the industry have helped us build an impressive portfolio of products with our original code. From well-established companies to bootstrapped startups - we have been supporting businesses by delivering quality code and UX consulting.

Source: SmartCourt

Mobile tennis coach

SmartCourt is an innovative solution for every Tennis player. Anyone can check their progress and game statistics in real-time on the mobile app, playing on the court. The system is based on @NVIDIA technology and innovative proprietary algorithms.

React NativeTypeScriptHooksReanimated2React Query

What Our Clients Say?


We implemented the first version of our mobile application in React Native in cooperation with TheWidlarzGroup. A major asset was exceptional and efficient communication; feedback was applied immediately, and the development team was effective and involved from start to end. Especially the innovative team selection model, which ensured high-quality service at a reasonable (although not low) price, deserved notice. Our cooperation was very professional and if I had to do it all over again, I would choose TWG.

Piotr Szacinski

Co-Founder & CTO @SmartCourt

The team cares about the outcome of their work which is the final product. I would call it a product-centric software development and if I were to choose a team for my next project, I would choose The Widlarz Group. They are not just implementers, but also a reliable IT partner that I can trust. Software developers from the team know what they do, and they have created solutions with flexibility and extensibility in mind so that the code is future-proof. The service involved end-to-end software development, and the team has helped us with the design, quality, and mobile and web app development, all of the team members are smart and communicate well. Also, the team is well-organized, you can just sit down and see the product growing.

Christian Schultheiss

Technical Coordinator @Talentbay

Creators of the modern, fast, maintainable and performant React Native open source libs

Customizable, simple, animated in-app notification✨

table showing performance of rn-emoji-keyboard

Super performant, lightweight, fully customizable emoji picker 🚀

Supporting the community and giving back as much as possible. We are the silver sponsor of the App.js conference.

Meet The Leaders

He's the one who brought this whole team into fruition. Before TWG he’s been working with humans and with machines and he loves doing both. Daily responsibilities: dot-connecting, networking, problem-solving, mentoring, React Native advocation, and more. He hates toil and loves innovation. He's been a parkour athlete for 10years, now he's retired and enjoys other sports.



I am the right hand of CEO. I do everything that is not programming. My responsibilities include administration. I’m currently helping with the recruitment process and organizing everything that could improve work in our team. I love working remotely. In my private life, I am a beagle dog breed lover.


Business Manager

Into JavaScript, Typescript, and Elixir. For quite some time React Native has been consuming most of my days and this is for sure, without a doubt, lots of fun and excitement! Huge fan of F.R.I.E.N.D.S, a coffee addict, and a gym amateur after hours.


Tech Lead, Software Developer

React and React Native enthusiast, currently responsible for our inside Academic project. Into bike rides, dodge coins, and other cryptocurrencies.


Tech Lead, Software Developer

Craftsmanship. I passionately enjoy developing mobile and web applications. My greatest satisfaction comes from good architecture, clean code, and solving the problems at the source. Adrenaline junkie: ASG, MTB, rollerblading, climbing, bikepacking


Tech Lead, Software Developer


Project Manager


HR Manager

As a QA, I monitor the quality of mobile apps and websites. I like it because I can see the product evolving from one stage to another, and check if all functionalities are running properly. Mom of 4.5-year-old Jacob. Into Zakopower band, books, gardening. I love to spend time outside the city and prefer singing birds over street hustle.


QA Engineer, Team Leader

I am a UX/UI Designer with an interest in accessibility and simplifying everyday life through design. I also love graphic design, the 90s, generative design and Basquiat.


UX/UI Designer, Team Leader

I'm a front-end developer working with React and React Native. I make sure to challenge myself daily and learn new skills that will help me achieve my goals. I spend my free time either reading, watching good movies or discovering new places. I'm also a winter sports enthusiast.


Software Developer, Team Leader

I am a Front-End developer, coding mainly in React and React Native. Teamwork is what I believe in and appreciate. I feel great satisfaction in participating in a project that grows continuously. Into sports, mainly gym, hiking, and cycling. Someday I’ll definitely jump with a parachute.


Software Developer, Team Leader

Let's discuss 👉 rekrutacja@thewidlarzgroup.com

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Visit our Blog

Build the app like holidaily logo Holidaily

with widlarz logo

Read the full case study of building Holidaily.

The Demo App designed and developed in our laboratorium.


The design has never been so obvious before.

The app is written in React Native. It’s full of

animations and native feel and look.


  • Fintech
  • Health Care
  • E-commerce
  • Entertainment
  • Gambling
  • Telecommunication

Business models

  • Consultancy
  • Workshops
  • Outsourcing
  • Team Extension
  • Audit & Estimation


  • iOS/Android
  • React/React Native
  • Node.js
  • TypeScript