Senior JS Developer

Brno / Full-time

ContentKing is growing at a rapid pace and we’re looking for a senior JS Developer to help us build our web application, which is used by customers all around the globe. It’s a challenging job, with a lot of variety, freedom and responsibilities.

What is ContentKing

ContentKing is a website monitoring service used by digital marketers all around the globe. For customers like Condé Nast, Atlassian and Gartner we monitor their websites 24/7, keeping track of any change and alerting them whenever something goes wrong.

The challenge

Increased productivity is one of our main selling points. ContentKing monitors sites with millions of pages and maintains an index with a huge amount of data that is constantly changing and updating. Our customers must be able to work with this data as quickly as possible, and which is why we have an uncompromising emphasis on UX.

That’s why we implemented:

  • Virtual scrolling in tables with millions of rows instead of paging
  • Our own Chrome extension
  • Full integration with History API and reliable Back button
  • Lazy rendering and retrieving data by viewport
  • … and all that with data that changes and syncs constantly

We are looking for someone to take on these battles, and with the help of our Lead Developer will lead the army to many others.

Our culture


As a self-service SaaS company we constantly keep scalability in mind. We need to 10x our customer base without having to 10x our team.

We are building a sustainable company with a healthy financial fundament. We don’t want to hire an army of customer support reps and developers just to keep things running.

Ownership and transparency

We’re a small team (4 developers, 2 designers, 1 product manager), so being a developer at ContentKing isn’t just about jamming out code.

Working at ContentKing means contributing to the product on a conceptual level as much as contributing to the codebase.

That’s why every team member has a lot of ownership and we aim to be fully transparent:

  • Want to know what features customers are requesting?
    → Check our Productboard.
  • Curious what bugs customers are stepping into?
    → Check Sentry.
  • Interested in seeing what users are reporting on support?
    → Check Intercom or the #support channel on Slack.
  • Eager to know our business metrics such as revenue?
    → Check Geckoboard on any of the screens in the office.

Codebase and processes

The codebase is our crown jewel. We design and apply modular architecture, follow good code style and continuously refactor the code to keep it healthy and a pleasure to work with. All this helps us grow as developers every day.

Furthermore we put a lot of effort into sharing knowledge and helping each other accomplish the work. We do that through constructive peer review, mentoring sessions and in-depth sprint retrospectives.

What we’re looking for

We are looking for colleagues who feel comfortable challenged by the above description and meet the following requirements:

  • 3+ years experience with client-side JavaScript
  • Experience with React or similar framework
  • Familiar with modern design patterns
  • Eager to improve personal skillset
  • Able to communicate in English

As a bonus, meeting any of the following criteria would be awesome:

  • Experience with data visualization
  • Experience with performance optimization
  • Experience with Redux or similar uni-directional flow pattern

Our interview process

The interview process consists of three steps:

  1. Initial meeting with our Lead Developer
    The scope of this meeting is to get to know each other’s background and experience, and so that you can learn how we do things in more detail.
  2. Second meeting with our Product Manager and our front-end developer
    As you will closely work together with them on the product it’s essential that you get to know each other and for both sides to see what it’s like to work together.
  3. Third meeting with our CEO
    In the third and final meeting you will meet our CEO to discuss the contractual details and compensation package.

What we offer

First and foremost we offer a job that’s full of interesting challenges and potential to learn.

Secondly, we offer good conditions:

  • A competitive salary and the possibility to gain equity
  • Full-time employment (so you can actually buy a house if you want to)
  • Work from our awesome office in the center of Brno
  • Flexibility in working hours and home office
  • Join a fast-growing startup building a platform used daily by customers like Atlassian, CondĂ© Nast and Gartner
  • Work together with smart, creative and driven people

Are you ready for your next challenge? Apply now.

This is us!

We are a diverse bunch of marketers, developers and designers. United by reconciling boundless creativity with healthy pragmatism and driven by our passion to create the best digital marketing software on the market.

ContentKing team