Security Engineer - Founding Engineer - Helios : Job Details

About Us

We're a venture-backed startup building an innovative AI-driven platform called Proxi for policy professionals. Our product helps users navigate complex regulatory, legislative and emerging compliance environments through a voice-driven interface powered by our cutting-edge semantic search pipeline operating over our immense legislative and regulatory data corpus. Our team's experience spans roles across the White House, State Department, K&S Law, Microsoft and Datadog.

The Role

As our founding security engineer, you'll have the unique opportunity to define and build the security architecture for an AI-native platform from the ground up. While we have initial security foundations in place, you'll own the vision, strategy, and implementation of a comprehensive security program that scales with our rapid growth. You'll work directly with the founding team to shape product decisions, establish security culture, and build systems that protect sensitive policy data while enabling breakthrough AI capabilities.

This role offers exceptional equity participation and the autonomy to build your ideal security program.

Location: New York City

Strategic Responsibilities

• Define the security architecture and roadmap for our AI-native platform
• Establish security principles and practices that become core to our engineering culture
• Lead security strategy for novel challenges in voice AI, semantic search, and policy data protection
• Drive product security decisions at the architecture level
• Build and scale the security function, including mentoring future team members
• Own relationships with security vendors and select best-in-class tooling
• Influence product direction to ensure security-by-design principles

Technical Leadership

• Design zero-trust architecture for multi-tenant AI systems
• Implement advanced threat detection for AI-specific attack vectors
• Architect cryptographic solutions for protecting sensitive legislative and regulatory data
• Build security automation and DevSecOps pipelines
• Establish supply chain security for AI models and data pipelines
• Create security frameworks for voice processing and real-time streaming
• Lead incident response and threat hunting initiatives

Core Technical Areas

• Modern cloud-native security (GCP, Cloud Run, containerization)
• AI/ML security including prompt injection prevention and model security
• Advanced cryptography and key management systems
• Identity and access management at scale
• API security for high-throughput AI services
• Security observability and detection engineering
• Compliance automation for government and enterprise customers



What We're Looking For

• Track record of building security programs at high-growth startups
• Deep expertise in cloud-native and AI security challenges
• Experience with security architecture for voice/audio processing systems
• Strong engineering background with ability to build, not just audit
• Strategic mindset combined with hands-on technical excellence
• Experience navigating compliance requirements (SOC2, FedRAMP, etc.)
• Ability to balance security with product velocity in a startup environment

Unique Challenges You'll Tackle

• Securing voice-driven AI interfaces against novel attack vectors
• Protecting sensitive policy data while enabling powerful semantic search
• Building trust systems for AI-generated policy insights
• Creating security patterns for real-time AI processing pipelines
• Designing authentication for voice-first interactions
• Establishing security boundaries in multi-tenant AI environments

Proxi is an AI-native platform that breaks away from the 'copilot' model where LLMs are merely added as features to existing technology. We act as an extension of the user and their interests, working 24/7 to perform work that would otherwise take hours.

We're not looking for passengers; we want driven innovators who see the opportunity to define security for the next generation of AI applications. If you're excited by the challenge of securing AI systems that handle sensitive policy data through voice interfaces, and you want the autonomy to build something exceptional from the ground up, this is your moment. We're building a category-defining product - don't just apply; make your mark.