Job Overview
Location
London, UK
Job Type
Full-time
Category
Security Engineer
Date Posted
May 12, 2026
Full Job Description
đź“‹ Description
- • Security engineer, application security role at Writer Inc., focused on securing AI systems powering enterprise platforms for global brands like Mars, Marriott, Uber, and Vanguard
- • Day-to-day responsibilities include conducting threat modeling with product teams, owning and evolving the application security program (SAST/DAST in CI/CD, security code reviews), establishing secure coding standards, designing security features for customer environments, integrating AI agents to boost security team velocity, leading penetration testing of applications and APIs, implementing controls for data pipelines and model training, and researching emerging AI/ML threats
- • Writer is a $1.9B-valued enterprise generative AI company founded in 2020 with offices in San Francisco, New York, Austin, Chicago, and London, building trustworthy AI that unites IT and business teams to enable enterprise-wide transformation
- • The role offers the opportunity to define how enterprise AI applications are secured, work at the intersection of application security, AI infrastructure, and developer enablement, and tackle novel challenges like securing AI agents and protecting training data pipelines in a hybrid London-based position reporting to the head of security engineering
🎯 Requirements
- • 4+ years of hands-on experience in application security engineering with a proven track record securing large-scale production systems, preferably in fast-growing startups or high-growth environments
- • Understanding of developer experience and workflows, with a focus on reducing risk while maintaining engineering velocity
- • Technical expertise in at least two programming languages (Python, Java, Go, JavaScript/TypeScript) and ability to read/review code across multiple languages, grasping both business logic and security implications
🏖️ Benefits
- • Generous PTO plus company holidays
- • Comprehensive medical and dental insurance
- • Paid parental leave for all parents (16 weeks)
- • Fertility and family planning support
- • Early-detection cancer testing through Galleri
- • Competitive pension scheme with company contribution
- • Annual work-life stipends for wellness (gym, massage/chiropractor, personal training) and learning and development
- • Company-wide and team off-sites
- • Competitive compensation and company stock options
Skills & Technologies
About Writer Inc.
Writer Inc. provides an enterprise-grade generative AI platform for creating, editing and governing business content. The system embeds into workflows to generate marketing copy, documentation, emails and other text while enforcing brand, style and compliance rules. It includes a language model, style guides, snippets, terminology management and analytics, all designed to maintain consistency across teams. Clients use Writer to accelerate content production, reduce revisions and ensure regulatory adherence without sacrificing human oversight.
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