Senior Software Engineer - Security/Infrastructure

The role

You will design and implement infrastructure to protect systems handling sensitive workflows for AI training and enterprise integrations. You will also build core systems including human-in-the-loop platforms and data infrastructure.

What you will do

• Build systems that identify and respond to real security events across our stack
• Replace manual security workflows with programmatic, scalable solutions
• Strengthen our cloud and production environments (GCP/AWS, containers, networking)
• Design and enforce access control systems across internal teams, experts, and customers
• Integrate security checks directly into development workflows
• Own incident handling systems and processes from detection through resolution
• Secure surfaces unique to AI systems, including data flows and model interaction layers
• Develop human-in-the-loop systems used in AI training and evaluation
• Contribute to core infrastructure and internal tooling used across the company
• Ship features across the stack that directly impact customers and model performance

Required qualifications

• Built internal tools or systems to solve security problems
• Strong programming ability in Python, Go, or TypeScript
• Experience working with cloud environments (IAM, networking, containers)
• Ability to identify vulnerabilities directly in code and system design
• Experience creating or maintaining signal-based monitoring and alerting systems
• Comfortable owning production issues when they arise
• Able to move fluidly between security work and general engineering
• 2-7 years building software or security systems

Nice to have

• Background in fast-scaling startups or high-output engineering teams
• Exposure to AI systems, data pipelines, or model evaluation workflows
• Familiarity with offensive security techniques
• Experience building tools that other engineers depend on
• Evidence of building and shipping systems from zero to production

Benefits

• Health Insurance: Medical, Vision, Dental
• 401(k) with Employer Match
• Daily Meals: Daily UberEats Stipend
• Monthly Wellness Stipend
• Meaningful equity

About the company

AfterQuery is an applied research lab curating data solutions for foundation model development. They are based in San Francisco and serve frontier AI labs.