What you'll do:

• Design and build the security foundations that power NeoSigma's platform across infrastructure, backend services, and developer tooling.
• Develop secure systems for authentication, authorization, identity, secret management, and service-to-service communication.
• Lead security architecture reviews and threat modeling for new platform capabilities, APIs, and AI infrastructure.
• Partner closely with engineering teams to identify, prioritize, and remediate security risks throughout the software development lifecycle.
• Build and scale automated security tooling across CI/CD pipelines, including static analysis, dependency scanning, infrastructure validation, and policy enforcement.
• Build secure infrastructure for cloud, customer-managed, and enterprise deployments, ensuring strong isolation, reliability, and scalability.
• Support security incident response, root cause analysis, and continuous improvements that strengthen the resilience of NeoSigma's platform.
• Collaborate across product, infrastructure, and platform engineering teams to build secure-by-default systems that enable developers to move quickly.
• Stay current with emerging security techniques, attack vectors, and AI infrastructure challenges, translating them into practical improvements across the platform.

What we look for:

• Hands-on experience securing cloud-native infrastructure (VPCs, Kubernetes RBAC, IAM) across at least two major cloud providers.
• Strong familiarity with enterprise deployment patterns: self-hosted, air-gapped, BYOC, and hybrid control plane models.
• Proven experience owning a compliance program (SOC 2, ISO 27001, or equivalent) rather than just contributing to one.
• Experience building or securing multi-tenant SaaS platforms with strong customer data isolation requirements.
• Ability to engage directly with enterprise security and procurement teams: field questionnaires, run trust review calls, and turn customer feedback into roadmap items.
• Strong ownership mentality and ability to thrive in a fast-paced startup environment where you are the security function, not one member of it.
• Bachelor's degree in Computer Science, Engineering, or a related field (or equivalent practical experience).

Our Core Values

• Customer Obsession - We start with the customer and work backwards. We aim to earn trust through consistent delivery, thoughtful listening, and by obsessing over customers.
• Intellectual Honesty - We operate with high trust and low ego. Ideas matter more than titles, and we communicate openly and directly while assuming good intent, even in strong disagreement.
• Bias for Action - We set high standards and move quickly to meet them. We prefer building and learning with customers over debating in the abstract, and we iterate based on real feedback.
• Extreme Ownership - We take responsibility for outcomes, not just tasks. Ownership means seeing problems through to completion and ensuring solutions truly work in practice.

Benefits and perks

• Competitive salary plus meaningful equity package
• Comprehensive medical benefits and generous PTO
• Flexible work arrangements
• Direct impact on company direction and technical decisions
• High ownership and the opportunity to make a career-defining impact

• Visa sponsorship

As a founding member, you’ll help define the technical foundation of NeoSigma. Your scope will grow with the company, from owning core systems end-to-end to shaping architecture, hiring, and engineering culture. This role has a natural path toward technical leadership or engineering management as the team scales.

About Us

NeoSigma is a product-driven research lab building the intelligence layer that helps close the feedback loop between your customers, products, and AI systems.

We are a small, intensely technical team of researchers and engineers who have trained frontier-scale models and widely used AI products and agents at MIT, Parallel Web, Essential AI, Apple, and Amazon.