Łukasz Nawrocki, Developer in Poznań, Poland
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Łukasz Nawrocki

Verified Expert  in Engineering

Web App Development Developer

Poznań, Poland
Toptal Member Since
February 11, 2022

Łukasz is a passionate React Native developer with over five years of experience. He has worked for small startups and large corporations, creating smooth and pleasant experiences for hundreds of thousands of users from all around the world. In his work, Lukasz values constant communication and attention to detail to understand a client's needs.


YASH Technologies
React Native, JavaScript, Vue, Mobile App Development, Swift, Java...
React Native, REST, Jest, TypeScript, React Native Navigation...
React Native, GraphQL, Jest, JavaScript, Mobile App Development, iOS...




Preferred Environment

React Native, React, Firebase, React Navigation, JavaScript, Mobile App Development, Push Notifications

The most amazing...

...thing I've developed is a Push notification-driven app using GraphQL. Our team has taken a new approach to a problem and redesigned the solution from scratch.

Work Experience

Front-end Engineer

2021 - PRESENT
YASH Technologies
  • Released iOS and Android Native applications despite a short deadline.
  • Proposed and developed Vue Native, a React Native wrapper, solution for the application allowing to maintain one repository for mobile applications instead of two, using JavaScript.
  • Took responsibility for major refactor of two Vue.js microfrontends, improving the system's stability.
  • Managed, oversaw, and improved four repositories using TypeScript, Swift, and Java for mobile and web applications.
Technologies: React Native, JavaScript, Vue, Mobile App Development, Swift, Java, Web App Development, Mobile Apps, iOS, APIs, Amazon Web Services (AWS), Mobile, Android, Front-end, REST APIs, HTML, CSS, Next.js, Node.js

Senior React Native Developer

2019 - 2021
  • Delivered offline-first, reliable, and performant applications.
  • Helped and mentored other developers in the team, leading a squad of four people.
  • Participated in talks with the client to suggest more performant and better user experiences.
  • Fixed crucial parts of the application under time pressure multiple times.
Technologies: React Native, REST, Jest, TypeScript, React Native Navigation, Mobile App Development, Redux-Saga, iOS, Mobile Apps, Redux, React, APIs, Mobile, Android, Front-end, REST APIs, HTML, CSS

React Native Developer

2017 - 2019
  • Designed and created Push notification-driven React Native application from scratch.
  • Built web modules in React for customers' web applications.
  • Took active part in company-wide talks, helping to define software testing strategy.
Technologies: React Native, GraphQL, Jest, JavaScript, Mobile App Development, iOS, Redux-Saga, APIs, Mobile, Front-end, HTML, CSS

React Native Application for Traveling

Leading a small React Native squad at software house Sonalake.

I have worked with large travel industry customers, developing trips aggregator apps similar to Kayak Trips or Google Travel.

The main goal of this project was to rewrite an already existing Native app with React Native. Because of specific conditions during travel, the app had to be 100% reliable offline.

Customers to which the app is delivered are only corporate, with users being mainly business people from Fortune 500 companies. This requires the app to provide a top-notch, modern experience and native-like performance.

The team consists of junior regular-level developers, so one of my primary responsibilities is to mentor and help others write quality code.
2013 - 2014

Master's Degree in Smart Aerospace and Autonomous Systems

University of Évry - Évry, Essonne, France

2009 - 2013

Bachelor's Degree in Automation and Robotics

Poznań University of Technology - Poznań, Poland


React, React Navigation, Redux-Saga, Vue, REST APIs, Node.js


React Native, Redux, Jest, Next.js


JavaScript, TypeScript, HTML, CSS, Swift, Java, GraphQL


Firebase, iOS, Mobile, Android, Amazon Web Services (AWS)




Mobile App Development, Mobile Apps, APIs, Front-end, Push Notifications, Web App Development, React Native Navigation, Software Development, Autonomous Robots, Software

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