Senior Security Engineer, Offensive Security

Accountabilities:

As a Senior Security Engineer, you will combine hands-on offensive security work with strategic security engineering, helping teams identify risks early and embed security into product and infrastructure development.

• Plan, scope, and execute penetration tests, red-team engagements, and adversary-emulation exercises across products and services.


• Develop proof-of-concept exploits and produce clear, risk-rated findings with actionable remediation guidance.


• Retest vulnerabilities to validate that remediation has been successfully implemented.


• Conduct security reviews and threat modeling across application architecture, designs, code, and emerging AI products.


• Build and maintain offensive security tooling, automation, security tests, and exploit capabilities to expand testing coverage.


• Partner with engineering teams to design and implement security architecture, controls, Zero Trust practices, and least-privilege access.


• Support security programs including automated security design reviews and vulnerability management.


• Investigate security events, participate in incident response, and contribute to a rotating on-call schedule.


• Collaborate with product, engineering, and other stakeholders to promote security-by-design practices.


• Contribute to security roadmaps, monitoring improvements, anomaly detection, compliance initiatives, and security documentation.


• Own recurring penetration tests and adversary-emulation activities while engaging with external security researchers where appropriate.


• Help strengthen security practices for cloud infrastructure, containerized environments, and AI/ML systems.

Requirements

The ideal candidate combines strong hands-on offensive security capabilities with software development expertise, cloud security knowledge, and the ability to influence security practices across technical and non-technical teams.

• 3+ years of experience in security engineering, including hands-on offensive security and penetration testing across applications and infrastructure.


• 2+ years of hands-on software development experience with Python or Golang.


• Deep knowledge of authentication and authorization, including OAuth, applied cryptography, and Zero Trust principles.


• Strong practical experience securing cloud environments such as AWS, GCP, or Azure.


• Hands-on penetration testing experience across SaaS web applications and APIs, including manual exploitation beyond automated scanners.


• Proficiency with offensive security tools and techniques, including Burp Suite and OWASP frameworks.


• Ability to develop security tests, exploits, and proof-of-concepts that identify real-world vulnerabilities.


• Understanding of AI/ML security risks and mitigations, including prompt injection, data poisoning, model extraction, and adversarial attacks.


• Practical experience using LLMs and agentic tools to automate vulnerability discovery, reconnaissance, and penetration testing workflows.


• Experience building security programs and automation from the ground up using risk-based prioritization.


• Experience performing security reviews and developing or improving automated security review processes.


• Excellent communication skills and the ability to explain complex security concepts to both technical and non-technical stakeholders.


• Strong understanding of security standards and a commitment to keeping up with emerging security technologies and models.


• Collaborative mindset with the ability to drive security improvements through cross-functional partnerships.


• Offensive security certifications such as OSCP, OSWE, OSEP, GXPN, GPEN, or CRTO are valued.


• Published CVEs, original security research, or conference presentations are a plus.


• Experience with container escapes, Kubernetes attack paths, cloud red teaming, or AI/ML security testing is advantageous.


• Ability to work remotely and operate effectively with a high degree of autonomy.


• This position does not offer visa sponsorship.

• Fully remote, remote-first working environment.


• EU compensation of €118,860–€169,800, plus equity.


• Flexible scheduling designed to support autonomy and work-life balance.


• Generous paid time off, quarterly Whaleness Days, and an end-of-year Whaleness break.


• Home office support to help create a comfortable and effective workspace.


• Technology stipend equivalent to US$100 net per month.


• Annual learning and development stipend for conferences, courses, certifications, and professional development.


• 16 weeks of paid parental leave after six months of employment.


• Equity for all full-time employees.


• Comprehensive medical, retirement, and paid holiday benefits, varying by country.


• Opportunity to work on security challenges spanning cloud infrastructure, containers, AI/ML, and large-scale developer platforms.


• Offices available in Seattle and Paris for connection and collaboration when relevant.


• Company merchandise and team perks.

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