Security Engineer, Application Security (UK)

Stack

Responsibilities

• ▹Lead threat modeling sessions with product teams, designing secure architectures
• ▹Own the application security program: establish and maintain SAST/DAST scanning in CI/CD
• ▹Partner with engineering teams to establish secure coding standards and reusable security patterns
• ▹Design security features and products that protect customer environments
• ▹Integrate AI agents to increase velocity for the security team and engineering org
• ▹Lead security assessments and penetration testing across applications, AI services, and APIs
• ▹Design security controls protecting data pipelines, model training environments, and customer-facing AI agents

Requirements

• ▹4+ years hands-on experience in application security engineering, securing large-scale production systems
• ▹Technical expertise in at least two programming languages (Python, Java, Go, JavaScript/TypeScript)
• ▹Knowledge of security tools and methodologies: SAST/DAST, vulnerability management, DevSecOps
• ▹Excellent communication skills translating complex security concepts
• ▹A builder's mindset focused on automation and scale

Soft skills

What we offer

• ▹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 (Galleri)
• ▹Competitive pension scheme with company contribution
• ▹Annual wellness and learning & development stipends
• ▹Company-wide and team off-sites
• ▹Competitive compensation and stock options

About the company

WRITER is an enterprise AI platform that helps the world's leading companies orchestrate AI-powered work. Founded in 2020, with offices in San Francisco, New York City, Seattle, Austin, Chicago, and London. Customers include Mars, Marriott, Uber, and Vanguard. Valued at $1.9B and backed by leading investors.