Senior Security Engineer - Cyber Defense

Senior Security Engineer (Cyber Defense)

OpenBet · Athens, Greece (Hybrid) · Full-time · Posted 2026-09-23

Workplace: hybrid

Department: Corporate

Description

The Team

OpenBet is a global leader in betting and gaming entertainment, trusted by over 200 partners to create memorable winning moments for millions of players worldwide. From processing bets during iconic events like the FIFA World Cup and Super Bowl to pioneering next-gen products like BetBuilder, we continuously redefine the player experience with high-quality content, cutting-edge technology, and advanced player protection tools.

For over 25 years, our unbeatable platform has powered the most recognizable betting brands, ensuring peak performance with 100% uptime, unmatched scale, and speed. With 85 licenses, 20 World Lottery Association operators on our customer roster, and a team of 1,200+ experts across 14 countries, we remain at the heart of the industry.

The Goal

OpenBet is looking for a highly motivated Senior Security Engineer to join its Cyber Defense team. Reporting to the Cyber Defense Senior Security Manager, this role is responsible for designing, implementing, administering, and improving security controls and security technologies across cloud and on-premises environments.

The successful candidate will combine strong security engineering expertise with hands-on experience in security operations, incident response, and security monitoring.  This position participates in a on-call rotation to support critical security incidents and operational escalations.

What you’ll be doing

• Own the administration, hardening, and optimization of security tooling (SIEM, EDR, WAF, DAST/SAST, and Vulnerability Management platforms).
• Act as a security advisor for infrastructure, cloud, and application changes, promoting security-by-design principles.
• Monitor, investigate, and lead the response to security incidents, performing deep-dive log and root-cause analysis.
• Build and maintain SIEM detection use cases, correlation rules, and alerting dashboards.
• Coordinate vulnerability assessments and penetration testing, validating remediation with Engineering teams.
• Support GRC and audit readiness by validating technical security controls and collecting evidence.
• Maintain Incident Response playbooks, runbooks, and participate in an on-call rotation for critical incidents.

The Player

• BSc in Computer Science, Cybersecurity, or related field.
• 6–7 years of experience in Cybersecurity, operating within fast-paced, high-availability environments.
• Expertise in security architecture, Zero Trust principles, and cloud security across major platforms (AWS/Azure/GCP).
• Hands-on experience implementing and customizing security tech (WAF, NDR, EDR) and infrastructure hardening.
• Proficiency in incident management, root cause analysis, digital forensics, and penetration testing methodologies.
• Familiarity with MITRE ATT&CK, SOAR, threat intelligence, and key frameworks (GLI-33, WLA, ISO 27001, SOC 2).
• Strong project management and communication skills to influence global stakeholders.
• Professional English fluency (written and spoken).

What’s the Score?

Why OpenBet? 

• The Platform: Operate infrastructure at real scale, supporting some of the biggest betting events in the world, where reliability is the product. 

• The Journey: Be part of our evolution from a strong on-premises foundation to a hybrid estate, and help shape how we get there. 

• The Impact: Make a real impact on the platforms that power the world's most recognisable betting brands. 

• The Culture: Join a culture of creativity, collaboration, and curiosity, where every idea is welcomed and every voice is heard. 

• The Growth: Take your career where you want it to go, with guidance, development, and support for certifications as you progress. 

What we can offer YOU:

• We have a collaborative hybrid office environment with our team members at least 3 days per week in the office.
• Attractive benefits, an open and supportive environment as well as a modern and exciting workplace
• The opportunity to interact with global teams on a regular basis as you and our business continues to develop & grow
• Tangible and genuine development - at OpenBet, you can take your career where you want it to go!
• And if that’s not enough; enjoy flexible working whilst we provide you with the guidance and development skills you need to progress and enhance your career

At OpenBet, we celebrate diversity and believe in creating an inclusive environment where every voice is valued and respected. We're committed to building a team that reflects the rich tapestry of humanity, embracing individuals from all walks of life, backgrounds, and identities. Join us in shaping the future of iGaming, where diversity isn't just celebrated—it's celebrated.

Apply

Apply at OpenBet

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