Application Security Engineer — Threat Modeling & Secure CI/CD

Jobtailor; California (MO); On-site; USD 120,000 - 180,000; Full time

Job summary

Jobtailor is seeking an experienced Application Security Engineer to shape secure product decisions from day one and lead the security program across engineering teams.

You will drive threat modeling, design secure architectures, implement SAST/DAST in CI/CD, perform code reviews, and partner with developers to embed secure coding standards and AI security practices to accelerate secure software delivery.

Qualifications

• Minimum 4 years of hands-on experience in application security engineering.
• Proven track record of securing large-scale production systems.
• Understanding of developer experience and developer workflows for shipping features and products.
• Technical expertise in at least two programming languages: Python, Java, Go, or JavaScript/TypeScript.
• Ability to read and review code across multiple languages, understanding business logic and security implications.
• Knowledge of SAST/DAST solutions, vulnerability management platforms, security testing frameworks, and DevSecOps practices.
• Excellent communication skills for translating complex security concepts to technical and non-technical audiences.
• Alignment with WRITER's values of Connect, Challenge, and Own.
• Role open to Mid, Sr. and Staff level candidates.

Responsibilities

• Conduct threat modeling sessions with product teams
• Design secure architectures for new features
• Ensure security considerations shape product decisions from day one
• Own and evolve the application security program
• Establish and maintain SAST/DAST scanning in CI/CD pipelines
• Conduct security code reviews for critical changes
• Build automation to catch vulnerabilities before production
• Partner with engineering teams to establish secure coding standards
• Create reusable security patterns and libraries
• Design and recommend security features and products for customer environments
• Integrate and leverage AI agents to increase security-team and engineering velocity
• Lead security assessments and penetration testing of applications, AI services, and APIs
• Identify vulnerabilities and collaborate with teams on remediation at scale
• Design and implement security controls for data pipelines, model training environments, and customer-facing AI agents
• Research emerging LLM and generative-AI attack vectors and build proactive defenses
• Report to the head of security engineering

Skills

Threat Modeling

Secure Architecture

Vulnerability Management

Security Assessments

Penetration Testing

Vulnerability Automation

Security Controls

Code Review

AI Security

Security Testing

DevSecOps

Communication Skills

Tools

SAST/DAST Tools

Job description

Jobtailor is seeking an experienced Application Security Engineer to shape secure product decisions from day one and lead the security program across engineering teams.

You will drive threat modeling, design secure architectures, implement SAST/DAST in CI/CD, perform code reviews, and partner with developers to embed secure coding standards and AI security practices to accelerate secure software delivery.