About Tenzai

Tenzai is building autonomous AI hackers that think like the world's best offensive security experts, act like them, and then help fix what they find before the real ones do. If this mission speaks to you, come defend the world's software: autonomously, continuously, and in-depth.

About the role

We’re looking for a Senior Fullstack Engineer to join the team and take a key role in building core product capabilities end-to-end — from frontend to backend and data.

• Own and build core product capabilities end-to-end - from frontend interfaces to backend services, databases, and production deployment
• Build modern web applications using Angular, TypeScript, Python, and Rust across a full-stack architecture
• Design scalable backend services, APIs, and microservices
• Translate complex cybersecurity and AI workflows into intuitive, high-performing product experiences
• Collaborate closely with Product, UX, Security Research, AI/ML Research and R&D teams to define and ship impactful features
• Contribute to frontend architecture, reusable UI components, shared infrastructure, and performance optimization
• Write and maintain automated tests across the stack (unit, integration, E2E) using tools like Vitest, Playwright, and Pytest
• Participate in technical design, architecture discussions, code reviews, and engineering best practices
• Work in an AI-heavy development environment using coding agents, automation, and modern developer tools

• 8+ years of experience building production-grade web applications
• 3+ years of hands-on experience with Angular and TypeScript, with strong frontend architecture skills
• Experience building scalable backend services, APIs, and full-stack features (Python advantage)
• Strong experience with microservices, relational databases, and storage systems such as PostgreSQL and S3
• Strong engineering fundamentals including testing, debugging, clean code, and production ownership
• Ability to work independently in a fast-paced startup environment with high ownership
• Experience collaborating cross-functionally with Product, UX, Security Research, and engineering teams
• Comfortable working in AI-assisted development environments and modern developer workflows

Advantages

• Experience in cybersecurity, AppSec, identity security, or enterprise SaaS
• Experience building products for technical users such as security, DevOps, or engineering teams
• Experience with cloud platforms, observability, real-time systems, or shared frontend infrastructure/design systems