Staff security engineer, application security

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Staff security engineer, application security in USA

WRITER
Full time
Email

USA
09/25/2026
Report

Seattle, WA

Responsibilities

Conduct threat modeling with product teams and design secure architectures for new platform features.
Own and evolve the application security program, including SAST/DAST scanning in CI/CD pipelines, security code reviews, and vulnerability-detection automation.
Establish secure coding standards, reusable security patterns, and libraries that help developers build securely by default.
Design security features and products that protect customer environments and partner with engineering teams on secure product decisions.
Integrate AI agents to improve security-team and engineering-team velocity while proactively reducing risk.
Lead security assessments and penetration testing of applications, AI services, and APIs, and collaborate on remediation at scale.
Design security controls for data pipelines, model-training environments, and customer-facing AI agents.
Research emerging LLM and generative-AI attack vectors and build defenses against novel risks.

Requirements

At least 4 years of hands-on application security engineering experience securing large-scale production systems.
Understanding of developer experience and workflows for shipping features while balancing security risk and engineering velocity.
Technical expertise in at least two of Python, Java, Go, JavaScript, and TypeScript, with the ability to review code across multiple languages.
Knowledge of SAST/DAST solutions, vulnerability management platforms, security testing frameworks, and DevSecOps practices.
Strong communication skills for explaining security concepts to technical and non-technical audiences and motivating action.
A builder’s mindset focused on automation, scalability, and enabling rather than blocking the business.
Alignment with WRITER’s values of Connect, Challenge, and Own.
The role is open to mid, senior, and staff-level candidates.

Benefits

Hybrid work from WRITER’s New York City, San Francisco, or Seattle offices.
Generous PTO and company holidays.
Medical, dental, and vision coverage for employees and families.
Sixteen weeks of paid parental leave for all parents.
Fertility and family-planning support.
Early-detection cancer testing through Galleri.
Flexible spending accounts, dependent-care FSA options, and an HSA with company contribution for eligible plans.
Annual wellness and learning-and-development stipends.
Company-wide and team off-sites, company stock options, and a 401(k).

Salary: $183k - $240k/yr

WRITER

WRITER delivers compelling, high‑quality content that drives engagement and amplifies brand voices across digital platforms. Our team blends strategic insight with creative storytelling to craft copy that resonates, converts, and stands out in a crowded marketplace. By partnering closely with cli...

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