Security engineer, application security (UK)

Writer
London
Workplace: HybridFull timeFunction: CybersecurityExperience: 4+ yearsSkills: ["Communication","Collaboration","Builder mindset","Risk reduction","End-to-end ownership"]

Build application security foundations for WRITER’s enterprise AI platform, partnering with engineering teams to embed security from day one. Lead threat modeling for LLM architectures, evolve SAST/DAST security in CI/CD, and run security assessments and penetration testing across applications, AI services, and APIs. Design controls for data pipelines, model training environments, and customer-facing AI agents while staying ahead of emerging AI/ML security threats.

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FursaFursa
Writer
Writer
2 days ago

Security engineer, application security (UK)

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Source: Company careers pageValidated by: Fursa AI
Last checked: 8 hours agoStatus: Live
Reposted: similar role first listed 6 months ago

Job Summary

Build application security foundations for WRITER’s enterprise AI platform, partnering with engineering teams to embed security from day one. Lead threat modeling for LLM architectures, evolve SAST/DAST security in CI/CD, and run security assessments and penetration testing across applications, AI services, and APIs. Design controls for data pipelines, model training environments, and customer-facing AI agents while staying ahead of emerging AI/ML security threats.
Location: London
Workplace: Hybrid
Employment Type: Full time
Job Function: Cybersecurity
Seniority: Mid level

Key Responsibilities

  • •Conduct threat modeling sessions with product teams and design secure architectures so security is considered from day one.
  • •Own and evolve the application security program, including SAST/DAST in CI/CD, security code reviews, and automation to prevent production vulnerabilities.
  • •Establish and champion secure coding standards, creating reusable security patterns and libraries for developers.
  • •Integrate and leverage AI agents to help increase velocity for the security team and engineering organization.
  • •Lead security assessments and penetration testing across applications, AI services, and APIs, and design controls for data pipelines and model training environments.

Pay and Benefits

Perks:Paid LeaveHealth InsuranceDentalParental LeavePensionWellness StipendLearning BudgetEquity

Key Requirements

  • •4+ years of hands-on application security engineering securing large-scale production systems.
  • •Experience with developer workflows and developer experience while balancing risk and shipping velocity.
  • •Proficiency in at least two programming languages (Python, Java, Go, JavaScript/TypeScript) and ability to review code across languages.
  • •Knowledge of security tools and methodologies such as SAST/DAST, vulnerability management platforms, security testing frameworks, and DevSecOps practices.
  • •Ability to communicate complex security concepts clearly to technical and non-technical audiences.
Experience:4+ yearsApplication securityDevSecOpsAI infrastructureGenerative AI
Skills:CommunicationCollaborationBuilder mindsetRisk reductionEnd-to-end ownership
Tech Stack:PythonJavaGoJavaScriptTypeScriptSASTDASTCI/CDDevSecOpsPenetration testingLLMAI/MLAPIs

Company Brief

Writer
Provides an AI writing platform for enterprises that helps teams create on-brand, high-quality content at scale using customizable style guides, real-time suggestions, and governance controls.
Industry: AI & Machine Learning
Company Size: Medium (51 to 250 employees)
Growth: Growth Stage Startup
Funding: Series B
Headquarters: New York, United States
Founded: 2019
WebsiteLinkedIn