Junior JavaScript Developer (CKEditor 4 team)

Development · Warsaw, Mazowieckie
Department Development
Employment Type Employment
Minimum Experience Entry-level

CKSource is a successful software company with more than 14 years on the market. There’s a good chance you’ve used one of our products or at least read online content created with our rich text editing component - CKEditor. We are proud to deliver software solutions to IBM, Microsoft, Siemens, Citibank, Disney, NBCUniversal, Accenture, Amazon, Mozilla, Deloitte and hundreds of more worldwide-recognized brands.


We're currently looking for a Junior Developer to join the CKEditor 4 team. The successful candidate will work on CKEditor 4 itself and other CKEditor-related tasks in the future.


What we expect you to have:


  • Knowledge of JavaScript (ES5, ES6).
  • Good knowledge of HTML, CSS.
  • Analytical, self-motivation, and problem-solving skills.
  • Ability to work with the DOM in native JavaScript.
  • Good command of English (at least B2).


What would be nice to have:


  • Experience in a similar position.
  • Experience with Git.
  • Experience with NodeJS.
  • Being familiar with tools and libraries such as GitHub, Webpack, Babel, Karma, ESLint, Grunt.
  • Ability to write tests (unit tests, integration tests, E2E tests).


  • Working on bug fixes.
  • Developing new features.
  • Supporting customers and community.
  • Participating in the testing phase before each release.
  • Participating in planning future work.
  • Working on workflow and internal tools improvements.

In return we offer:


  • Working with Open Source projects that have been used by millions of people worldwide for over a dozen years.
  • Working with a fantastic team of developers who are nice people after hours, too.
  • Stable, reasonable and flexible working conditions - you decide the starting hours and can take a break during the day if needed.
  • A great company where we cooperate, communicate openly, care for, and respect one another.
  • We highly value our employees’ development, providing challenging tasks and mentoring by senior team members.
  • Additional days off and budget for self-development (up to 5 days and 6.000 PLN a year depending on the company tenure).
  • Independent decision-making - as you gain experience, you will have more influence on the choice of solutions, technology, tasks, etc.
  • B2B contract (up to 445 PLN) or employment contract (4.000 - 7.500 PLN gross).
  • Private healthcare package of choice (either Enel Med or Medicover).
  • MultiSport card.
  • Friendly office with a relaxed atmosphere during and after hours.




By clicking the "Apply now" button you hereby authorize CKSource sp. z.o.o. sp.k. to process your personal data provided in the application documents for realizing the recruitment process pursuant to the Personal Data Protection Act of 10 May 2018 (Journal of Laws 2018, item 1000) and in agreement with Regulation (EU) 2016/679 of the European Parliament and of the Council of 27 April 2016 on the protection of natural persons with regard to the processing of personal data and on the free movement of such data, and repealing Directive 95/46/EC (General Data Protection Regulation). The above consent is voluntary, you have the right to withdraw your consent at any time. The administrator of your personal data is CKSource Sp. z o.o. Sp.k. based in Warsaw, ul. Słomińskiego 15. Your data will be processed only for the purposes of the recruitment process. After the recruitment process, your data will be deleted.

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  • Location
    Warsaw, Mazowieckie
  • Department
  • Employment Type
  • Minimum Experience