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Senior Offensive Security Engineer
  • Warsaw
Senior Offensive Security Engineer
Warszawa, Warsaw, Masovian Voivodeship, Polska
WINGED IT SP Z O O
6. 3. 2025
Informacje o stanowisku

technologies-expected :


  • App Security
  • Writing and reviewing code
  • Pentesting
  • AWS

about-project :


  • Do you want to play a key role in revolutionizing the future of finance? Join Klarna - a global leader in deferred payments, with over 85 million active users and 2.5 million transactions processed daily! As a pioneer in modern payment solutions, Klarna is developing innovative methods that streamline the shopping experience, enhance transaction security, and expand the availability of purchasing options.
  • Were seeking individuals eager to achieve remarkable results and share their bold vision to redefine the future of payments and fintech. Send us your CV - we can’t wait to meet you!
  • Our client: Klarna
  • Location: Warsaw (hybrid work: 2-3 days in the office)
  • Duration: long-term agreement

responsibilities :


  • Conduct both white-box and black-box penetration tests on internal and public-facing applications and assets;
  • Manage, triage, and investigate Bug Bounty submissions and external penetration testing findings;
  • Perform variant analysis on vulnerabilities identified through different channels;
  • Perform in-depth security analyses of third-party solutions;
  • Develop tools to improve reconnaissance, automation, and metrics collection;
  • Provide expert guidance to developers, product security teams, and the SOC to ensure effective issue remediation;
  • Share knowledge by delivering demos, workshops, and training sessions on offensive security practices;
  • Identify and address security issues in code, with a strong focus on Java and Node.js environments.

requirements-expected :


  • At least 7 years of experience on a similar role;
  • Work proficiently within cloud environments like AWS, leveraging modern microservices design principles;
  • Demonstrate strong scripting skills and contribute to larger Python projects;
  • Possess industry-recognized certifications (e.g., OSCP, OSWE, CREST, GIAC);
  • Strong educational background in Computer Science, Information Technology, or a related field;
  • Language proficiency: Advanced English (minimum B2 level).

offered :


  • Great opportunity for personal development in a stable and friendly large multinational company
  • Start-up mentality, small agile teams
  • Global Reach: Impact millions with seamless shopping and payments
  • Career growth and additional education

  • Praca Warszawa
  • Chief security officer Warszawa
  • Warszawa - Oferty pracy w okolicznych lokalizacjach


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