Principal Security Engineer

Aiwyn is the first complete platform for modern Accounting Firms. Backed by top-tier investors like Bessemer, KKR, and Revolution, we build category-defining technology, and we're doing it with world-class people, processes, and products.

To learn more, visit our website

We work with the majority of the Top 500 firms in the country. We're replacing brittle, decades-old accounting practice management systems with software accounting firms can actually trust, and we have rare product-market fit in an industry that's about to change permanently.

We're looking for a Principal Security Engineer to help strengthen and mature engineering security at Aiwyn.

This is a hands-on technical leadership role focused on securing our SaaS platform, development infrastructure, and software delivery systems. You'll partner closely with engineering leadership and teams to identify risks, improve security practices, and build the tooling and automation needed to make secure development easier.

You'll play a key role in advancing our engineering security capabilities, with a particular focus on software supply chain security, vulnerability management, and secure development practices. Working alongside engineering leadership, you'll help shape our security strategy and drive the technical initiatives that support it.

We're looking for a strong engineer with security expertise, sound judgment, and a willingness to tackle new challenges. You don't need to know everything, but you should be comfortable taking ownership, learning quickly, and turning security challenges into practical solutions.

• Software Supply Chain Security: Improve security across our CI/CD pipelines, build infrastructure, dependencies, and deployment processes. Help establish secure, reliable software delivery practices.
• Vulnerability Management: Own and improve our vulnerability scanning and remediation capabilities, including tooling, automation, prioritization, and integration into engineering workflows.
• Product & SaaS Security: Partner with engineering teams to strengthen application, cloud, and infrastructure security. Help address risks around customer data, access controls, APIs, and third-party integrations.
• Security Architecture: Lead threat modeling and security reviews for critical systems, helping teams identify risks and make sound architectural decisions.
• AI Security: Explore how emerging AI capabilities, including tools and models such as Daybreak and Mythos, can improve security engineering. Help teams understand and address risks introduced by AI‑assisted development, agents, and LLM integrations.
• Security Strategy: Partner with engineering leadership to identify gaps, prioritize improvements, and establish practical security standards and processes.
• Technical Leadership: Own security initiatives from design through implementation, influence technical decisions, and help build security expertise across engineering.

• Strong engineering background in software, platform, infrastructure, or security engineering, with hands‑on experience building and operating complex systems.
• Solid security fundamentals and practical experience improving security in software development, cloud infrastructure, or production environments.
• Experience with software delivery security
  , including CI/CD, vulnerability management, supply chain security, or related areas.
• Understanding of SaaS security
  , including the challenges of protecting customer data, securing applications, and operating cloud‑based services.
• AI‑forward mindset
  , with an interest in emerging AI security capabilities and an understanding of the opportunities and risks AI introduces.
• Technical leadership and ownership
  ,…