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NEXIFY INFOSYSTEMS LLC
Security Engineer Engineering Security
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Job Description
We are
Hiring:
Security Engineer -
Engineering Security Location:
Seattle, WA (Preferred) / Sunnyvale, CA
Duration:
6 Months Contract
Work Model:
Full-Time, approximately 40 hours/week
Open Positions:
5 Looking for local candidates only. Candidates with 4-6 years of experience are also welcome.
Key Focus Areas:
ERD Security and Privacy Reviews Threat Modeling Third-Party AI Agent Security Testing Application and API Security Cloud and Distributed Systems Security Adversarial Security Testing Key Responsibilities:
Conduct security and privacy design reviews for services, applications, APIs, engineering proposals, and AI integrations. Perform threat modeling for critical services and AI agents, identifying attack surfaces, threats, attack paths, mitigations, and residual risks. Perform hands-on security testing of third-party AI agents, including prompt injection, tool misuse, excessive agency, data access, permissions, external integrations, and sensitive-data exposure. Document security findings, risk assessments, evidence, and actionable remediation guidance. Collaborate with engineering, security, privacy, and third-party teams to validate remediation. Develop repeatable security assessment processes, threat models, test cases, reporting templates, and automation workflows.
Minimum Qualifications:
3+ years of professional experience in Security Engineering, Application Security, Product Security, Offensive Security, Systems Architecture, or a related field. Experience reviewing technical designs and identifying security risks across applications, APIs, cloud services, microservices, or distributed systems. Strong understanding of threat modeling, vulnerability classification, authentication, authorization, least privilege, and data protection. Hands-on experience with security testing, vulnerability investigation, penetration testing, adversarial testing, or security control validation. Strong communication and collaboration skills with engineering, security, privacy, and third-party teams.
Preferred:
Experience assessing AI/LLM agents, prompt injection, and unsafe tool use. Experience with privacy design reviews and cloud security. Security automation experience using Python, Go, Bash, or similar languages. Hands-on penetration testing and vulnerability assessment across applications, APIs, cloud infrastructure, and networks. Experience identifying real-world attack paths and providing actionable remediation guidance.