Software security engineer, embedded
Job Description
📐 About this role
WRITER is seeking a Software Security Engineer (Embedded) to design, build, and scale the systems that protect our users, their data, and their interactions with our AI/AGI services.
At WRITER, we believe security should be seamless for our customers—baked into the platform so it’s invisible in daily use, but unyielding against abuse. This role blends deep software engineering expertise with a product mindset to deliver security tools, frameworks, and controls that serve millions of users without slowing them down.
You’ll be responsible for fraud prevention, abuse detection, identity systems, and secure-by-default development platforms that empower our engineering teams to move quickly without compromising safety. If you can turn complex security requirements into elegant, developer-friendly solutions, this is your stage.
Role Boundaries & Collaboration
What You Own (Responsible)
Customer authentication and authorization systems
Fraud and abuse detection systems
Customer-facing AI security controls
Internal security platforms and tools
Security libraries and frameworks for engineering teams
Security metrics and dashboards
What You Don't Own (Others Lead)
Employee identity systems (Enterprise/Corporate owns)
Infrastructure identity (Cloud/Infrastructure owns)
AI security research (AI Security owns)
Infrastructure security tools (Cloud/Infrastructure owns)
Compliance requirements (GRC owns)
Key Partnerships
With AI Security: They research threats; you build customer protections
With Detection & Response: They detect attacks; you build preventive systems
With Cloud/Infrastructure: They provide infrastructure; you build security features
With Enterprise/Corporate: Clear boundary at customer vs. employee identity
🦸🏻♀️ Your responsibilities
Protect customers at scale — Build fraud detection, rate limiting, abuse prevention, and LLM interaction controls (prompt injection prevention, output filtering).
Own customer identity security — Design and implement authentication and authorization systems, protecting customer data and AI service interactions.
Engineer security platforms — Create tools and dashboards that automate repetitive security tasks, track vulnerabilities, and enable cross-team security efficiency.
Build reusable security frameworks — Develop secure-by-default APIs, SDKs, cryptographic libraries, and communication frameworks for company-wide use.
Strengthen platform security — Implement multi-party authorization, secrets management, audit logging, and zero-trust networking components.
Empower developers — Deliver self-service security tools and frameworks that integrate seamlessly with engineering workflows.
Lead technically — Drive the architecture of security systems, mentor engineers, review designs, and influence security strategy across the organization.
⭐️ Is this you?
Required Experience
8+ years in software engineering, building production systems.
5+ years developing security-focused tools, libraries, or platforms.
Proven success building systems adopted by hundreds of engineers.
Experience with fraud detection or abuse prevention at scale.
Deep expertise in distributed systems and API design.
Strong programming skills in Go, Python, or similar languages.
Technical Expertise
Expert in software design patterns and scalable architectures.
Proficiency with authentication and authorization protocols (OAuth, SAML, OIDC).
Understanding of LLM security challenges and mitigation strategies.
Experience building high-performance, customer-facing systems.
Hands-on with data processing, analytics, and automation platforms.
Execution & Impact
Track record of 90%+ adoption of security tools by engineering teams.
History of reducing security friction through automation and thoughtful design.
Proven ability to scale security systems to millions of users.
Strong product sense and empathy for customer experience.
Preferred Qualifications
Background in fraud or risk engineering at scale.
Experience with AI/ML-specific security challenges.
Knowledge of financial security and compliance standards.
Contributions to open-source security projects.
Experience at consumer-facing technology companies.
🍩 Benefits & perks (UK full-time employees):
Generous PTO, plus company holidays
Comprehensive medical and dental insurance
Paid parental leave for all parents (12 weeks)
Fertility and family planning support
Early-detection cancer testing through Galleri
Competitive pension scheme and company contribution
Annual work-life stipends for:
Home office setup, cell phone, internet
Wellness stipend for gym, massage/chiropractor, personal training, etc.
Learning and development stipend
Company-wide off-sites and team off-sites
Competitive compensation and company stock options
