Janusz Kowalski
Janusz Kowalski

Senior Web Developer

Actively looking · Member since 11 Feb 2025
Message
Location
Poland
Desired salary
from 35 USD/hourly
Work preference
Full Time, Contract, Part Time
Experience level
Not set

About

Professional summary

10+ years of experience as a software engineer, with a focus on front-end development. Proven track record in developing high-quality and scalable web applications. Expertise in HTML, CSS, JavaScript, ReactJS, Angular.js, Vue.js, Typescript and NodeJS. Passionate about web standards and keeping up with the latest trends in technology. Skilled at coordinating cross-functional teams in a fast-paced, deadline-driven environment to steer timely project completion.

Skills

17 capabilities

Experience

Career history

Senior Frontend Developer Companisto

- Developed a PWA for teachers from scratch and worked on existing parents' and students' PWAs using React.js/Next.js, React context, React Query, Typescript, Tailwind and MUI(Material UI).
- Implemented microfrontend architecture for the admin portal to convert Angular.js-based pages into React.js, and Typescript.
- Created several custom hooks and wrote unit testing, integration testing, and e2e testing using
Cypress and Jest.
- Updated and maintained the legacy application built on Vue 2, Vuetify, and Vuex.

Senior Frontend Engineer JobLogic

- Developed and maintained frontend features for the web application, enhancing user
engagement and experience.
- Worked on the generative AI-based chatting bot to pop up more correct suggestions quickly.
- Implemented scalable and maintainable frontend architectures, ensuring optimal performance and usability for millions of users.
- Actively contributed to performance optimization efforts, reducing page load times by 6% and
improving overall responsiveness.

Frontend Developer Metrixstudio

- Built patients report pages using React.js, Next.js, React Context, React Query, React Hook Form.TypeScript, Tailwind CSS, and MUI(Material UI).
- Developed a patient-health coach conversation page and integrated with Metrixstudio API.
- Refactored existing frontend codebase to follow best practices and implemented mobile
responsiveness across all the pages to provide users with better UX experiences.
- Developed a DNA analysis and meeting scheduling module for health coache.

Senior Fullstack Developer Orangutech

- Developed and customized 8 web and mobile apps for eCommerce, B2B, B2C, Health Care by using React.js, Vue.js, Angular1/2, Typescript, Flux.
- Added analytics tracking to the web application using Segment, Mixpanel and Google Analytics.
- Wrote unit testing, integration testing and e2e testing using Mocha, Jest, Enzyme, and Cypress.
- Developed a hybrid MLM system by using Vue.js, Vuetify, Vuex, Vue-chart, D3.js for the frontend and Laravel/PHP for the backend.

Fullstack Developer Porta One

- Worked as a part of an Agile team in the development of enterprise services for clients.
- Added analytics tracking to the web application using Segment, Mixpanel and Google Analytics.
- Developed a custom tagging tool for marking trip destinations using Commercey’s GeoPlanet API.
- Worked on several e-commerce engines for customers using Javascript, Magento, PHP, jQuery.

Education

Learning history

University of Toronto

Bachelor Degree

This professional hasn’t added portfolio projects yet.

This professional hasn’t listed any services yet.

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