AI Software Engineer, Security

Purpose Bits; San Francisco (CA); On-site; USD 210,000 - 260,000; Full time

Job summary

Purpose Bits in San Francisco is seeking a Senior Security Architect to define and build security architecture for product surfaces that operate across customer workspace content. You will translate threat models into concrete engineering requirements and production checks.

The ideal candidate has 8-10+ years of experience in designing or securing complex software systems, with strong judgment in security architecture and the ability to turn risk into product designs.

Qualifications

• 8-10+ years designing, building, or securing complex software systems.
• Ability to translate threat models into concrete engineering requirements and production checks.
• Strong judgment in security architecture and the ability to turn complex security risks into product designs.

Responsibilities

• Define and build security architecture for product surfaces that operate across customer workspace content.
• Translate threat models for new product surfaces into concrete engineering requirements and production checks.

Skills

Secure Software Engineering

Security Architecture

Security Product Strategy

Builder Mindset

Prompt-Injection Testing

Red Teaming

Model Behavior Evaluation

Abuse-Resistant Application Design

Enterprise SaaS Security Models

Developer Tooling

CI Checks

Coding-Agent Workflows

MCP Integrations

Internal Frameworks

Public Security Research

Vulnerability Writeups

Job description

Define and build security architecture for product surfaces that operate across customer workspace content. Translate threat models for new product surfaces into concrete engineering requirements and production checks.

Requirements:

Candidates should have 8-10+ years of experience in designing, building, or securing complex software systems. They should also possess strong judgment in security architecture and the ability to turn complex security risks into product designs.

Key Skills:

• Secure Software Engineering
• Security Architecture
• Security Product Strategy
• Builder Mindset
• Prompt-Injection Testing
• Red Teaming
• Model Behavior Evaluation
• Abuse-Resistant Application Design
• Enterprise SaaS Security Models
• Developer Tooling
• CI Checks
• Coding-Agent Workflows
• MCP Integrations
• Internal Frameworks
• Public Security Research
• Vulnerability Writeups