Senior JS Developer

Brno (CZ) / Full-time

ContentKing is growing rapidly, and we’re seeking a senior JS Developer to help us build our web application, used by customers around the globe. It’s a challenging position with a lot of variety, freedom, and responsibility.

What is ContentKing?

ContentKing is a website monitoring service used by digital marketers around the globe. For customers like Netflix, Shopify, Atlassian, and Fedex, we monitor their websites 24/7, keeping track of any changes and alerting them whenever anything goes wrong.

Trusted by 5,000+ digital marketers at companies like:

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 changing and updating constantly. Our customers must be able to work with this data as quickly as possible, and that is why we have an uncompromising focus on the User Experience.

That’s also why we’ve implemented:

  • Virtual scrolling in tables with millions of rows, instead of paging.
  • Full integration with the History API and a reliable Back button,
  • Lazy rendering and retrieving data based on viewport,
  • Our own Chrome extension,
  • …All for data that syncs and changes constantly.

We’re seeking someone who will take on these battles – and lead our army on through many others with the help of our Lead Developer.

Our Culture


We are building a sustainable company with a healthy financial foundation.

We don’t want to hire an army of customer support reps and developers just to keep things running, so scalability is central to everything we do.

Ownership and Transparency

We’re a small team, and so being a developer at ContentKing isn’t just about jamming out code.

We’re a small team, so 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 takes a lot of ownership, and we have a culture that's all about transparency and data sharing:

  • Want to know what features customers are requesting?
    → Check our Productboard.
  • Curious as to what bugs customers are running into?
    → Check Sentry.
  • Interested in what users are reporting to 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.
  • Have ideas how to improve the product or our processes?
    → Share them, and you'll likely see them get implemented.

Being a developer at ContentKing means being part of a tightly knit team of people passionate about product.

Codebase and Processes

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

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


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

  • Have 3+ years experience with client-side JavaScript,
  • Have experience with React or similar framework,
  • Be familiar with modern design patterns,
  • Be eager to improve your personal skillset, and
  • Be able to communicate in English.

Having experience with any of the following is a bonus:

  • TypeScript & GraphQL
  • Data visualization
  • Performance optimization.

Our Interview Process

The interview process consists of three steps:

  1. First interview, meeting our JS developers
    The purpose of this meeting is to get to know each other’s backgrounds and experience. We share our challenges and ways of working, and would love to get your thoughts on that.
    Andre NanningaAndre NanningaFrontend Developer Vojtech DobesVojtech DobesLead Developer
  2. Second interview, meeting our Product Manager
    As you will work closely 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.
    Veronika MartosovaVeronika MartosovaProduct Manager Vojtech DobesVojtech DobesLead Developer
  3. Third interview, meeting our CEO
    In the third and final meeting, you will meet our CEO to discuss the contractual details and compensation package.
    Vincent van ScherpenseelVincent van ScherpenseelCEO Vojtech DobesVojtech DobesLead Developer

What We Offer

First and foremost, we offer a position that’s full of interesting challenges and opportunities to learn.

Secondly, we offer good conditions:

  • Work at a fast-growing SaaS startup – building a platform used daily by customers like Atlassian, Netflix, and MongoDB.
  • Full-time employment, a competitive salary, 25 vacation days and additional perks.
  • An established path to gaining equity in the company.
  • A Macbook Pro for work and personal use.
  • A personal development budget of 10,000 Kč per year for conferences, books and online courses.
  • A Vodafone mobile subscription with unlimited calls, text messages and data.
  • A comfortable office in the city center of Brno (Masarykova street) with a fully stocked kitchen.
  • Weekly lunches with the whole team, paid for by the company.

Are you ready for your next challenge?

👉 Apply now by sending us an email or filling out this form (opens in a new tab)!

Ready for your next challenge? 🚀

Join our team of highly driven people passionate about product and building a scalable company.

Email us or fill out the form 👇

Work with 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.

We have open positions in Brno (CZ) and Amsterdam (NL).

Meet the team

ContentKing team
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ContentKing conference
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Help build ContentKing
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