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About the Role

As a security engineer, applications at WRITER, you'll be building the security foundations that protect the AI systems powering some of the world's most recognizable brands. You'll work at the intersection of application security, AI infrastructure, and developer enablement—partnering with engineering teams to embed security into every line of code while ensuring our platform remains both powerful and trustworthy. You'll help define how enterprise AI applications are secured, from threat modeling our LLM architectures to building automated security controls that scale across our growing platform. You'll tackle challenges that most security engineers never encounter: securing AI agents, protecting training data pipelines, and designing controls for systems that didn't exist a few years ago.

Responsibilities

Build security into the DNA of our AI platform by conducting threat modeling sessions with product teams, designing secure architectures for new features, and ensuring security considerations shape product decisions from day one
Own and evolve our application security program including establish and maintain SAST/DAST scanning in CI/CD pipelines, conducting security code reviews for critical changes, and building automation that catches vulnerabilities before they reach production
Partner with engineering teams to establish and champion secure coding standards, creating reusable security patterns and libraries that make it easier for developers to build securely by default
Design and recommend security features and products that help secure customer environments
Integrate and leverage AI agents to help increase velocity for the security team and the overarching engineering org
Lead security assessments and penetration testing of WRITER's applications, AI services, and APIs, identifying vulnerabilities across our tech stack and working collaboratively with teams to remediate issues at scale
Design and implement security controls for protecting data pipelines, model training environments, and customer-facing AI agents
Stay ahead of emerging threats in the AI/ML security landscape, researching attack vectors specific to LLMs and generative AI, and proactively building defenses against novel risks

Requirements

Minimum 4 years of hands-on experience in application security engineering, with a 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, JavaScript/TypeScript) and the ability to read and review code across multiple languages
Knowledge of security tools and methodologies including SAST/DAST solutions, vulnerability management platforms, security testing frameworks, and DevSecOps practices
Excellent communication skills that allow you to translate complex security concepts into clear recommendations for both technical and non-technical audiences
A builder's mindset that looks for opportunities to automate, scale, and empower rather than create bottlenecks
Alignment with WRITER's values of Connect, Challenge, and Own

Skills

Application Security
AI Infrastructure
Developer Enablement
Threat Modeling
SAST/DAST
Secure Coding Standards
Security Features
AI Agents
Penetration Testing
Data Pipelines Security
Model Training Security
LLM Security
Generative AI Security
Python
Java
Go
JavaScript/TypeScript

Location

New York City
San Francisco
Seattle

Work Type

Hybrid

Experience Level

Mid
Sr.
Staff

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 and learning and development
Company-wide off-sites and team off-sites
Competitive compensation
Company stock options
401k

About the Company

WRITER is where the world's leading enterprises orchestrate AI-powered work.
Our vision is to expand human capacity through superintelligence.
We are proving it's possible – through powerful, trustworthy AI that unites IT and business teams together to unlock enterprise-wide transformation.
With WRITER's end-to-end platform, hundreds of companies like Mars, Marriott, Uber, and Vanguard are building and deploying AI agents that are grounded in their company's data and fueled by WRITER's enterprise-grade LLMs.
Valued at $1.9B and backed by industry-leading investors including Premji Invest, Radical Ventures, and ICONIQ Growth, WRITER is rapidly cementing its position as the leader in enterprise generative AI.
Founded in 2020 with office hubs in San Francisco, New York City, Seattle, Austin, Chicago, and London, our team thinks big and moves fast, and we're looking for smart, hardworking builders and scalers to join us on our journey to create a better future of work with AI.

Equal Opportunity

WRITER is an equal-opportunity employer and is committed to diversity. We don't make hiring or employment decisions based on race, color, religion, creed, gender, national origin, age, disability, veteran status, marital status, pregnancy, sex, gender expression or identity, sexual orientation, citizenship, or any other basis protected by applicable local, state or federal law.
Under the San Francisco Fair Chance Ordinance, we will consider for employment qualified applicants with arrest and conviction records.