Senior JavaScript Developer

Development · Remote/Warsaw, Mazowieckie
Department Development
Employment Type Employment
Minimum Experience Experienced

CKSource is a successful software company with more than 15 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 have complex products that call for experienced developers. Openness, mutual respect and trust allowed us to build a great team.
You can choose from the following projects:

  • CKEditor 5 customer solutions - you'll be responsible for designing and implementing medium to large-sized editor features or improvements using our modern framework. Examples include advanced content tagging plugin, find & replace feature. Tech stack: ES2019, GitHub, ESLint, Chai.js, Mocha, Travis CI, ZenHub, Slack.
  • Easy Drive - a file manager with the ambition of becoming a Digital Asset Management solution at one point. The goal is to completely replace CKFinder, a self-hosted file manager that was launched in 2007 and Easy Image (our cloud solution). The main task will be to build a new product from scratch using the latest technologies. You will influence the architecture and design of the product. Tech stack: React, Redux, Jest, Enzyme, ESLint, git, GitHub, Github Actions, Slack.
  • Export to Word - a conversion library written in Node.js used for transforming HTML into .docx files. Since the project is relatively young you will have an influence on new features, architecture and tooling. This is a base for our existing products - CKEditor 5 Export to Word plugin and Export to Word API. Tech stack: Node.js (v12, ES6), Puppeteer, jsdom, Babel, Chai.js, Mocha, Sinon.JS, ESLint, python, git, GitHub, CircleCI, Slack.


  • you feel like taking up the challenge of working on an application used by millions of users;
  • you have at least 4 years of experience working in JavaScript ecosystem (most preferably pure JavaScript and React);
  • you have the experience and strong core skills with JavaScript (ES6), Node.js, HTML, CSS;
  • you can create complex applications in pure JavaScript;
  • despite the knowledge that you already have, you feel there is always more to learn;
  • you are focused on quality, tests, simple solutions, and clean code;
  • you have a good command of English (at least B2);

… then we are looking for you :) 


In return we offer:

  • a great atmosphere in a team of talented developers who are nice people, too :)
  • flexible working hours - you start at the time that suits you. If you need to go out somewhere - no problem;
  • tasks tailored to your predispositions;
  • agreement B2B (up to 1050  PLN net/day) or equivalent on the contract of employment;
  • quarterly and annual financial bonus depending on the company's performance;
  • additional days off and financial resources for personal development (up to 5 days and 6.000 PLN yearly, depending on the work experience);
  • all necessary equipment such as laptop, additional monitor and accessories;
  • private medical care (Enel Med or Medicover);
  • multisport card;
  • you can work 100%  remotely or from our Warsaw office (no dress code, no open space, chill room with Fussball and ping pong table).

Thank You

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