Secure Application Development Engineer Jobs

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Staff security engineer, application security

WRITER San Francisco, CA

San Francisco, CA

Today

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

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Job Description

WRITER is building security foundations for AI systems used at enterprise scale, and this Staff security engineer role sits at the intersection of application security, AI infrastructure, and developer enablement. You will help shape how teams design, test, and ship security into production by default, including work across applications, AI services, and APIs in a hybrid environment based in San Francisco.

This role focuses on strengthening application security programs, advancing automated defenses in CI/CD, and partnering closely with engineering teams to reduce risk without slowing delivery.

Responsibilities

Build security into the DNA of the AI platform by running threat modeling sessions with product teams, designing secure architectures for new features, and ensuring security considerations influence product decisions from day one
Own and evolve the application security program, including establishing and maintaining SAST/DAST scanning in CI/CD pipelines, performing security code reviews for critical changes, and creating automation that identifies vulnerabilities before they reach production
Collaborate with engineering teams to champion secure coding standards, including reusable security patterns and libraries that help developers build securely by default
Design and recommend security features and products that protect customer environments, serving as the advocate and vision for how customer security is delivered
Integrate and leverage AI agents to increase velocity for the security team and the broader engineering organization while minimizing risk
Lead security assessments and penetration testing of WRITER applications, AI services, and APIs, identify vulnerabilities across the stack, and work with teams to remediate issues at scale
Design and implement security controls for data pipelines, model training environments, and customer-facing AI agents
Stay current on emerging AI/ML security threats by researching LLM and generative AI attack vectors and proactively building defenses against novel risks

Requirements

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

Technologies

Python, Java, Go, JavaScript/TypeScript
SAST, DAST, CI/CD
AI agents, LLMs, generative AI, AI/ML

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 stipends for learning and development
Company-wide off-sites and team off-sites
Competitive compensation, company stock options, and 401k

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