* Developing CKEditor4 - advanced Rich Text Editor with use of ES5 syntax. Creating a versatile code run on various environments.* Developing CKEditor5 - advanced Rich Text Editor with use of ES6+.Creating features in a module-based approach.* Writing unit test for CKEditor4 and CKEditor5 with use of Mocha, Chai and in-house solution* Creating technical documentation with a use of JSDoc & JSDuck* Preparing guideline and example pages with usage details for the editor’s features.* Performing code review* Developing backed solution (Umberto) for static site generator with use of NodeJS, Hexo, and AWS S3* Releasing npm packages* Collaborating with Customer Success department to support clients* Responding directly to GitHub inquiries

* Providing Technical support for Polish and foreign branches with prodcuts: gemiusDirectEffect, AdOcean, gemiusPrism, gemiusHeatMap, gemiusStream, gemiusTraffic* debugging customers websites to ensure correct traffic measurments* analysing server responses with web traffic analysing tools (FireBug, HttpFox, Chrome Developer Tools)* investigate and troubleshoot issues (e.g. data discrepancies, technical issues, implementation)* testing display and video ad creatives including rich media, VAST, mobile* preparing customized reports, processing raw data (analysing big data set)* developing internal tools for data analysis and processes improvement (Python, MySQL, awk, bash)* delivering system documentation and instructions for internal and external distribution* working closely with development teams on products improvement and change requests (Scrum Model)* Resolving inquiries from internal and external customers regarding products (Atlassian JIRA)* providing training for new joiners and branches abroad, delivering training during internal workshops* managing monitoring team* improving monitoring procedures connected with company products* creating, with cooperation of programmers, instructions for monitoring team how deal with specific failure situation* participate in monitoring duties * working with Nagios tool* managing larger failures* providing internal communication connected with existing issues

* Providing Technical support for Polish and foreign branches with products: gemiusDirectEffect, AdOcean* debugging customers websites to ensure correct traffic measurements* analyzing server responses with web traffic analyzing tools (FireBug, HttpFox, Chrome Developer Tools)* investigate and troubleshoot issues (e.g. data discrepancies, technical issues, implementation)* testing display and video ad creatives including rich media, VAST, mobile* preparing customized reports, processing raw data (analyzing big data set)* developing internal tools for data analysis and processes improvement (Python, MySQL, awk, bash)* Resolving inquiries from internal and external customers regarding products (Atlassian JIRA)