What you'll do

• Own security across the full stack: backend, on-device, and browser extension
• Build access controls, encryption, and audit infrastructure that scale with the product
• Run threat assessments, find gaps, and close them before they become incidents
• Lead incident response: triage fast, contain damage, prevent recurrence
• Build logging and alerting that supports SOC 2 and catches real problems in real time
• Ship customer-facing security features across our dashboard, desktop app, and backend
• Talk directly with enterprise customers' security teams, answer hard questions, earn trust
• Tackle security challenges unique to AI agents: prompt injection, tool misuse, data leakage
• Set the security bar for the team, review code, shape standards, make it everyone's responsibility

Qualifications

• Hands-on security experience at a fast-moving startup
• Worked through SOC 2, HIPAA, or similar and can turn compliance into engineering decisions
• Can explain a zero-day to a founder and a post-mortem to a customer, clearly, every time
• Picks up unowned problems and finishes them with no hand-holding needed
• Built and operated high-scale systems in production and knows what breaks and why
• Bachelor's degree in Computer Science, Engineering, or related field (or equivalent 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.