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Jon J. Senior Front-end Developer (React, Node)

Jon J.

  • OAE
  • Full-time (40 hrs/week)
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I'm a seasoned Developer specialised in programming using the JavaScript language. I got over 6 years of overall professional experience gained in various projects in sectors such as IoT, e-learning, SaaS (law compliance), e-commerce, finance, biotech and IT Consulting. I have taken part both in planning and implementation of the early staged projects and as well as in maintenance of the large scaled heavy interfaces. I like to take part in every aspect of the software development, from planning, developing and testing to deployment and submission to the end client. ✅ Agile (Scrum) expertise acquired. ✅ High-end React and NodeJS projects delivered. ✅ Both remote and on-site development adapted, significant progress achieved.

Skills and experiences

Skills and experiences

Owner & Full-stack Developer (React, Node)

I4Y LLC 10/2018 - 11/2020

Owner of the LLC, have contracted an Italian and Scandinavian companies as a Full-stack (Node, React) consultant over the years... Some key clients: Barnebys, Be Poland, Unicredit Services, Prodata Consult, Novozymes.

Location: Warsaw, Mazowieckie, Poland

Full-stack Developer (React, Node)

DPOrganizer 08/2018 - 03/2019

Termination, start-up team lay off. DPOrganizer is a privacy management software - a powerful Software-as-a-Service - with a focus on ease-of-use, simplicity and flexibility. It helps map, visualise and report on personal data processing. Consultant's actions/responsibilities: * Take part in an active strictly followed Scrum team. * Implement both the back-end and front-end parts of the new rounds of functionalities. * Take part in deployment and code review. * Write Unit and as well as E2E tests. • Development of a SaaS product that helps Data Protection Officers do their job easier and better in terms of compliance with GDPR (RODO) and privacy management. Tools and technologies used: Hapi, Express, React, Less, Fluxible-js, React-bootstrap, Recharts, Storybooks, Bitbucket, Docker, Jira, Confluence, AWS

Location: Warsaw, Mazowieckie, Poland

Frontend Developer

SolarWinds 05/2018 - 09/2018

Seasonal contract before graduation... SolarWinds is a major software company, which provides system management tools for network and infrastructure monitoring, and other technical services Projects and duties: Appoptics - platform for application monitoring and infrastructure Actions/responsibilities: • Implementing the Front-end design/functionality. • React - styled-components. • Planning and designing the project flow. • Building the search interface for whole application. Pingdom Server Monitor - grab internal application data, watch slow requests Actions/responsibilities: • Implement and update the client’s needs using CoffeeScrpt. • Implement changes into Ampersand JS’s written structures.

Location: Cracow, Małopolskie, Poland

React Developer

Crucial Interactive 06/2017 - 04/2018

Crucial Interactive is a premium Canadian digital media and technology company... My duties/responsibilities: Contobox app: * Building responsive digital ad banners according to the PSD design layers. * Taking part in a Scrum team and keeping up with the ASANA specifications. XPHUB: * Building new views and assets in React. * Integrating the data with the back-end.

Location: Dushanbe, Tajikistan

Full-stack Developer

WEEDU 04/2016 - 06/2017

Developed an online learning platform from scratch for E2E communication (via third party) Allowing both educators and learners to have real-time video lessons distantly + providing real-time write/draw tools. My actions/responsibilities: • Plan and Design the logic. • Implement the client-side functionality (landing page, listing page, scheduling page, login®istration etc.) • implement the back-end side functionality (authentication, sessions, lessons etc.) • Continuous Delivery (deployed to Heroku servers)

Location: Warsaw, Mazowieckie, Poland

Javascript Developer

UXEON Sp. z o.o. 06/2015 - 03/2016

One of the few companies within the country specialising specifically in the Internet of Things. Having multiple apps within the SCADA flow. My Responsibilities included: * Developing new features in the app handling Iot for Automobiles, live tracking the vehicle and metrics... * Maintaining an app that live tracks the electrical power usage of larger factories... Technologies used: VanillaJS, Prototypal design pattern, JQuery, Set of GPS mapping libraries, Dygraphs, OpenLayers, ChartsJS

Location: Warsaw, Mazowieckie, Poland

Educations and Certifications

Akademia Finansów i Biznesu Vistula

Internet Technologies 2014 - 2018

Computer Engineering



Full professional


Full professional




Limited working


Full professional


Native or bilingual


Full professional
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