Information Security Engineer
Job Overview
Join us in bringing joy to customer experience. Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide.
Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves.
We’re seeking a hands-on, collaborative Enterprise Security Engineer to help mature and scale Five9’s corporate and IT security program. You’ll design, implement, and maintain the technical controls that secure our systems, endpoints, identities, and data, working cross-functionally to reduce risk, strengthen defenses, and support compliance.
Key Responsibilities:
Secure Corporate Infrastructure
- Design, implement, and manage security for corporate endpoints in a fully distributed environment.
- Deploy and operate security tools (MDM, EDR/XDR, ZTNA, SSO).
- Implement zero-trust principles: device trust, conditional access, least privilege.
- Enforce security baselines, hardening standards, and compliance policies.
- Build and maintain secure authentication and identity workflows.
Drive Risk Reduction
- Lead initiatives for endpoint hardening, identity security, and infrastructure protection.
- Partner with IT and business teams to implement practical, scalable controls.
- Develop and maintain IT security policies, standards, and procedures.
Detection, Response & Automation
- Respond to security incidents affecting corporate systems.
- Partner with Detection & Response to build alerts, detections, and monitoring.
Identity & Access Management
- Support secure provisioning, MFA adoption, and privileged access workflows.
- Review and maintain least-privilege access across systems and apps.
Documentation, Compliance & Education
- Maintain security documentation and architectural diagrams.
- Support compliance initiatives (SOC 2, ISO 27001, PCI, HIPAA, etc.).
- Promote security best practices and serve as a trusted advisor company-wide.
Security Culture & Education
- Evangelize security best practices through education, training, and internal communications.
- Serve as a trusted security advisor across the organization.
Requirements:
Must-Have
- 2+ years in enterprise/corporate/IT security engineering.
- Hands-on experience with:
- MDM platforms: JAMF, Intune, etc.
- EDR/XDR Solutions: CrowdStrike, SentinelOne, etc.
- Identity and Access Management: Okta, Entra ID/Azure AD, etc.
- Authentication protocols: SAML, OAuth, OIDC, SCIM
- Zero Trust Architectures: device trust, conditional access, least privilege
- SaaS security posture management (SSPM)
- Ability to drive projects independently and work cross-functionally.
- Strong communication skills and a pragmatic, risk-based approach to security.
Nice-to-Have
- Detection engineering or SOC experience.
- Knowledge of modern attacker techniques and social engineering threats.
- Compliance experience (SOC 2, ISO 27001).
- BYOD and contractor/vendor access security.
- Cloud security (AWS, GCP, Azure).
What Makes You Successful in this role
- Ownership: You identify problems, propose solutions, and execute.
- Builder mindset: Security as an enabler, not a blocker.
- Technical depth: Strong debugging and architecture skills.
- Pragmatism: Balance security with usability and business needs.
- Clarity: Strong communicator across technical and non-technical audiences.
Benefits:
- Five9 Shares
- Bonus Scheme
- 10% Flexi Benefit
- Meal Allowance
- Medical Insurance
- Life Insurance
- 25 day Annual Leave + Public Holidays
Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills. The more inclusive we are, the better we are. Five9 is an equal opportunity employer.
View our privacy policy, including our privacy notice to California residents here: https://www.five9.com/pt-pt/legal.
Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.