Senior Security Engineer - Application Security

Senior Security Engineer — Application Security

Location: United States — Remote | Department: Security | Reports to: Chief Information Security Officer

Nasuni is seeking a Senior Security Engineer specializing in application security and penetration testing to protect our growing portfolio of enterprise data infrastructure and SaaS products. You will identify and validate vulnerabilities, conduct penetration tests, guide secure design decisions, and work with Engineering to remediate and retest findings across Nasuni products, Resilio, DryvIQ, cloud services and emerging AI-enabled capabilities.

You will independently execute complex security assessments, coordinate assigned testing initiatives, and recommend risk-based priorities within established security standards. This hands-on role combines technical judgment, practical automation, and cross-functional influence.

• Conduct threat modeling, secure design and targeted code reviews for web applications, APIs, cloud services and appliances.
• Perform manual and tool-assisted penetration testing; document reproducible findings and verify fixes.
• Coordinate external penetration-test scoping, execution, report quality review, remediation tracking and retesting.
• Validate customer-reported vulnerabilities and advise Engineering on prioritization, mitigation and closure.
• Improve SAST, SCA, secrets detection, container scanning and CI/CD security workflows with engineering partners.
• Support SBOM and software supply-chain vulnerability impact analysis.
• Assess AI-enabled product features for access-control weaknesses, prompt injection and unintended data exposure.
• Use approved AI-assisted tools for test planning, code analysis and research; independently verify outputs and protect confidential data.
• Share practical security guidance and improve repeatable assessment processes.

Must-have qualifications

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