Information Security

Senior Penetration Tester (Belgrade)

Belgrade   |   Full Time

Our commitment to security is a top priority, and we are seeking a talented Mid to Senior Penetration Tester to join our team and help ensure the safety and integrity of our software solutions.

About us is a unicorn, product-based software company, with offices in California, Europe, and Asia.

We are focused on creating products that are used by millions around the world. Some of our products include Clockify (time tracking app), Pumble (business communication app), and Plaky (task management app).

Clockify is the world's #1 time tracker, used by millions, from individuals to big companies like Hewlett-Packard Enterprise, American Express, Amazon, etc.


  • Perform penetration tests on our web applications, mobile apps, and infrastructure
  • Identify, analyze, and document security vulnerabilities
  • Collaborate with development teams to prioritize and remediate identified vulnerabilities
  • Develop and implement effective penetration testing strategies and methodologies
  • Provide guidance and mentorship to junior penetration testers
  • Keep up to date with the latest security trends, tools, and best practices


  • 7+ years of commercial experience in penetration testing or related cybersecurity roles
  • Strong knowledge of web application security, mobile app security, and network security
  • Proficient in using various penetration testing tools (e.g., Burp Suite, Metasploit, Nmap, etc.)
  • Familiarity with programming languages (e.g., Python, Go, Java, etc.) and scripting for automation
  • Knowledge of vulnerability management and risk assessment processes
  • Bachelor's degree in Computer Science, Cybersecurity, or equivalent work experience
  • Ability to work in CET timezone (9:00-17:00 UTC+1)
  • Fluent in Ex-Yu languages (Serbian, Bosnian, Croatian, Montenegrin)


  • Certifications such as OSCP, OSCE, or similar
  • Experience with cloud security and infrastructure-as-code (IAC) tools
  • Familiarity with DevSecOps principles and methodologies

What we provide

  • Working in a product-based company with talented experts in the domain
  • Onsite (Belgrade office)
  • A supportive, healthy, and transparent work culture that encourages innovation and growth
  • Private health insurance
  • Private dental insurance
  • In-house learning program (social/soft skills workshops, leadership training, tech lectures, knowledge sharing, and tech clubs)
  • Fresh fruits, soft drinks
  • Breakfast in office

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