Software security engineer, embedded

📐 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 AIAGI 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 securebydefault development platforms that empower our engineering teams to move quickly without compromising safety. If you can turn complex security requirements into elegant, developerfriendly solutions, this is your stage.

Role Boundaries & Collaboration

What You Own (Responsible)

• Customer authentication and authorization systems

• Fraud and abuse detection systems

• Customerfacing AI security controls

• Internal security platforms and tools

• Security libraries and frameworks for engineering teams

• Security metrics and dashboards

• What You Dont Own (Others Lead)

  • Employee identity systems (EnterpriseCorporate owns)

  • Infrastructure identity (CloudInfrastructure owns)

  • AI security research (AI Security owns)

  • Infrastructure security tools (CloudInfrastructure 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 CloudInfrastructure: They provide infrastructure; you build security features

    • With EnterpriseCorporate: 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 crossteam security efficiency.

      • Build reusable security frameworks — Develop securebydefault APIs, SDKs, cryptographic libraries, and communication frameworks for companywide use.

      • Strengthen platform security — Implement multiparty authorization, secrets management, audit logging, and zerotrust networking components.

      • Empower developers — Deliver selfservice 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 securityfocused 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 highperformance, customerfacing systems.

          • Handson 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 AIMLspecific security challenges.

              • Knowledge of financial security and compliance standards.

              • Contributions to opensource security projects.

              • Experience at consumerfacing technology companies.

              • 
                🍩 Benefits & perks (US Fulltime employees)

                • Generous PTO, plus company holidays

                • Medical, dental, and vision coverage for you and your family

                • Paid parental leave for all parents (12 weeks)

                • Fertility and family planning support

                • Earlydetection cancer testing through Galleri

                • Flexible spending account and dependent FSA options

                • Health savings account for eligible plans with company contribution

                • Annual worklife stipends for:

                  • Home office setup, cell phone, internet

                  • Wellness stipend for gym, massagechiropractor, personal training, etc.

                  • Learning and development stipend

                  • • Companywide offsites and team offsites

                    • Competitive compensation, company stock options and 401k

                    • WRITER is an equalopportunity employer and is committed to diversity. We dont 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.

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