Senior Security Engineer

At o9, we invest in people. We seek talented, driven individuals ready to power our transformative journey. You’ll thrive in a dynamic, collaborative environment—and grow while making a real impact.

What You’ll Do

• 4–9 years of professional experience in cybersecurity .
• Minimum of 4 years in ethical hacking or red teaming is required.
• Hands-on experience with network security and penetration testing .
• Deep expertise in at least one public cloud (AWS, Azure, GCP) penetration techniques.
• Proficiency in the MITRE ATT&CK framework is mandatory.
• Proven ability to demonstrate real-world hack simulations or past engagements.
• Experience in security product testing is a plus.
• Familiarity with cybersecurity tools and technologies .
• Linux , programming , and SQL skills are preferred.
• Knowledge of reverse engineering and cryptography is an advantage.
• Understanding of techniques such as parameter manipulation, session hijacking, and cross-site scripting .

Certifications

Traits

What We Offer

Our Hiring Process

More About o9

At o9, transparency, collaboration, and open communication define our culture. We break down silos to foster innovation across levels and geographies.

Beyond work, we engage in volunteering , social impact initiatives , and celebrate diverse cultures . With a $3.7 billion valuation and offices across Dallas, Amsterdam, Barcelona, Madrid, London, Paris, Tokyo, Seoul, and Munich , we’re one of the fastest-growing tech companies globally.

o9 is an equal opportunity employer. We are committed to fostering an inclusive and diverse environment where everyone can thrive.

Join us—be part of the future of enterprise decision-making.