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Staff security engineer, application security

WRITER Seattle, WA

Seattle, WA

Today

$183k - $240k/yr Full time Ai Security Application Security Cybersecurity Tools

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Job Description

WRITER is building enterprise AI applications at scale, and this Staff security engineer role focuses on making the platform secure by design. You will help shape how AI-powered products are protected across application security, AI infrastructure, and developer enablement, while evolving CI/CD security practices and leading security testing.

This hybrid position is based in Seattle, WA and reports to the head of security engineering. If you have hands-on experience securing large-scale production systems and can balance security risk reduction with engineering velocity, this role aligns with your approach to building and scaling security foundations.

Responsibilities

Run threat modeling sessions with product teams, design secure architectures for new features, and ensure security considerations are part of product decisions from day one
Own and evolve WRITER’s application security program, including establishing and maintaining SAST/DAST scanning in CI/CD pipelines, performing security code reviews for critical changes, and building automation to prevent vulnerabilities from reaching production
Partner with engineering teams to define and champion secure coding standards, plus create reusable security patterns and libraries that enable secure-by-default development
Recommend security features and products to help secure customer environments, serving as a vision and advocacy partner for customer protection
Integrate and leverage AI agents to increase security team and engineering org velocity while proactively minimizing risk
Lead security assessments and penetration testing across WRITER’s applications, AI services, and APIs, identifying vulnerabilities across the stack and working with teams to remediate issues at scale
Design and implement security controls for protecting data pipelines, model training environments, and customer-facing AI agents
Research emerging threats in the AI/ML security landscape, including LLM and generative AI attack vectors, and proactively build defenses against new risks

Requirements

Minimum 4 years of hands-on application security engineering experience, with a track record securing large-scale production systems (bonus for fast-growing startups or high-growth environments)
Understanding of developer experience and developer workflows for shipping features, with focus on reducing risk while supporting engineering velocity
Technical expertise in at least two programming languages: Python, Java, Go, JavaScript/TypeScript, including ability to review code across multiple languages with both business logic and security implications
Knowledge of security tools and methodologies such as SAST/DAST, vulnerability management platforms, security testing frameworks, and DevSecOps practices, with judgment on when automation outperforms manual review
Excellent communication skills to translate complex security concepts for technical and non-technical audiences and drive action through clear recommendations
A builder mindset focused on automation, scaling, and enabling teams rather than creating bottlenecks
Alignment with WRITER values: Connect, Challenge, and Own
Open to Mid, Sr., and Staff level candidates

Technologies

SAST, DAST, CI/CD
Python, Java, Go, JavaScript/TypeScript
DevSecOps, LLMs, generative AI, AI agents
APIs, vulnerability management platforms, security testing frameworks

Compensation and location

Location: Seattle, WA (hybrid)
Salary: USD 183,000 - 240,000 per year

Benefits

Generous PTO plus company holidays
Medical, dental, and vision coverage for you and your family
Paid parental leave for all parents (16 weeks)
Fertility and family planning support
Early-detection cancer testing through Galleri
Flexible spending account and dependent FSA options
Health savings account for eligible plans with company contribution
Annual work-life stipends for Wellness (gym, massage/chiropractor, personal training, etc.)
Annual work-life stipend for Learning and development
Company-wide off-sites and team off-sites
Competitive compensation, company stock options and 401k

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