Senior Full Stack Developer (Clavister)

Poland Warsaw JavaScript React

We invite Full Stack developers to join the Clavister Engineering team and help us develop the leading European security-as-a-service.

As a Full Stack Developer, you care about the end-user experience, high-quality code across client, server, and databases, agile values, modern engineering practices, and sharing what you know to help others grow.



Clavister is now combining 20+ years of cybersecurity pedigree. They deliver physical and virtual cybersecurity appliances with a highly secure, highly portable, multi-tenant cloud architecture to develop the leading European security-as-a-service (the company’s competitors are the US, Chinese, or Israeli). To maintain their position as Swedish and European, they will operate their service using European infrastructure (i.e., not using AWS, GCP, nor Azure).

This is a very exciting time to join Clavister as they are refining their strategy to focus on a verticalization/specialization around selected customer segments and transitioning towards providing their cybersecurity solution as a service – this journey has just started, and you are invited to join! Read more here –… and here…


The Clavister Engineering team is delivering best-in-breed network security solutions to a global and versatile market. Join a project

We believe that the quality of our work is a shared responsibility within the development team, and we approach this by modern engineering practices like peer reviews, continuous integration, and automated testing.

All applicants will be asked to do a programming test – the result from that test, together with findings from a subsequent interview with Team members, is the data we will base our candidate selection on.

For this position, we will continuously review and interview qualified applicants.




  • Experience in working with Linux/Unix environments
  • Basic knowledge of TCP/IP-based network communications
  • Excellent/expert knowledge in Node.js and JavaScript
  • Experience in Web Front-end development using HTML and CSS
  • Excellent skills in both written and verbal communication, fluency in English
  • Experience with Git version control system
  • Knowledge of secure software development and the risks related to weak implementations

Would be a plus:

  • Experience in working with the Front-end framework React
  • Experience in the design of Web Front-end interfaces
  • Knowledge of IP security
  • Experience with bash scripting
  • Experience in working with a microservice architecture
  • Experience in working with cloud-first multi-tenant applications
  • Bachelor’s Degree or equivalent in Computer Science or Network Technology is beneficial or 3+ years of hands-on experience with software development, preferably related to network communication



Personal Profile

  • Good analytical and problem-solving skills
  • Team player, but also able to efficiently accomplish tasks and projects independently
  • Good time management skills and ability to deliver the right results at the right time
  • Self-motivated and committed
  • Cares about the end-user experience
  • Curious and passionate about learning new skills within other domains to create a robust team around t-shapes


  • Explore, scope, and design new functionality
  • Implement and Unit-test new features and solutions
  • Debug, enhance, and refactor existing functionality
  • Research new techniques to improve our products


  • Health & Legal support
  • Discount program
  • Sport activities
  • Outstanding offices
  • Comfortable place in a cozy room
  • Continuous education
  • Flexible schedule
  • Remote work
  • Diversity of Domains & Businesses
  • Variety of technology

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