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Jerzy LeśniakJL
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Jerzy Leśniak

@jerzyleniak

Senior frontend developer at AP-Tech who built interactive airport infrastructure visualizations for ATOS MonSter™.

Poland
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At AP-Tech, I developed interactive operator interfaces and airport infrastructure visualizations for ATOS MonSter™, an Airfield Lighting Control and Monitoring System. I used React, TypeScript, Material UI, and PixiJS to create reusable visualization components and graphical editing tools.

I also contributed to AP-Tech’s backend development using Python and Django, including data models, administrative interfaces, configuration management, and application business logic. I developed and maintained automated tests with Vitest and React Testing Library.

At Onwelo, I worked on FlotSpot, a car fleet management system. I implemented interfaces from designs, wrote Playwright tests, and coordinated frontend development while supporting teammates through technical guidance and knowledge sharing.

Earlier, I developed React and React Native applications at Softwarely, contributed to the Wakacje.pl web application at Onwelo, and worked on the Koleo web app and Polregio ticket sale system using Ember.js. At Connectis, I developed a solution for generating static HTML pages from React components.

Experience

Work history, roles, and key accomplishments

ON

Senior React Developer

Onwelo

Oct 2022 - Mar 2024 (1 year 5 months)

Provided design consulting and implemented user interfaces for the FlotSpot car fleet management system. Coordinated frontend development, conducted code reviews, and supported team members through technical guidance.

ON

Frontend Developer

Onwelo

Mar 2019 - Jun 2019 (3 months)

Contributed to the Wakacje.pl web application using React. Implemented user interfaces according to specific designs, performed code refactoring, and conducted unit tests.

KO

JavaScript Developer

Koleo

Aug 2018 - Feb 2019 (6 months)

Developed the Koleo web app and Polregio ticket sale system using Ember.js. Created a mechanism for selling season tickets and implemented the corresponding user interface.

Education

Degrees, certifications, and relevant coursework

PT

Polish-Japanese Academy of Information Technology

Bachelor of Science, Information Technology

2016 - 2019

Pursued a Bachelor of Science in Information Technology, focusing on software development and computer systems.

MU

Maria Curie-Skłodowska University

Media Production

2014 - 2016

Studied Media Production, gaining skills in media creation and production techniques.

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