Senior Software Engineer, Infrastructure & Automation

Description

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 Software Engineer, Infrastructure & Automation to join Tenzai and play a key role in building the engineering infrastructure behind our AI-powered offensive security platform.

You'll design and build the infrastructure required to automatically validate and improve our platform and agents, including AI-powered agents for testing, evaluating, and automation of our systems that ensure our platform infrastructure and AI agents perform is reliable, repeatable, and effective at scale. Working closely with our AI Research, Security Research, and Engineering teams, among other things, you'll develop the infrastructure that enables rapid experimentation, deterministic validation, and continuous evaluation of autonomous AI attackers.

If you're excited about building developer platforms, testing infrastructure, and complex distributed systems in a fast-moving AI startup, we'd love to meet you.

Responsibilites

Design and build the testing and automation infrastructure that powers Tenzai’s platform and autonomous security agents. Define and shape the platform architecture for that goal.
Build deterministic and indeterministic validation tools for platform behavior and repeatable, data-driven evaluation for non-deterministic agent behavior.
Help develop continuous evaluation pipelines that measure performance, compare models and releases, detect regressions, and surface actionable results.
Build Python services and automation that orchestrate distributed test runs and manage their environments, inputs, and results.
Create internal tools and agents and CI/CD integrations that improve experimentation speed, developer productivity, and release confidence.
Partner with AI Research and Security Research to define evaluation methodologies, success criteria, and coverage.
Own systems end to end - from architecture and implementation through production reliability and continued evolution.
Contribute to technical design, architecture discussions, and code reviews across the engineering organization.

Requirements

7+ years of software engineering experience, or equivalent depth demonstrated through the systems you have built and owned.
A strong track record of building and operating production backend automation systems, engineering infrastructure, or internal platforms.
Strong Python experience and the ability to design production-grade APIs, services, and distributed workloads.
Experience building testing frameworks, automation platforms, evaluation systems, or internal developer tooling.
A solid understanding of distributed systems, APIs, microservices, and cloud-native architectures, including concurrency, reliability, and failure modes.
Hands-on experience with CI/CD pipelines and modern software delivery practices.
The ability to take ambiguous technical problems, develop pragmatic solutions, and drive them through production.
High ownership, sound engineering judgment, and the ability to work independently in a fast-moving environment.
Clear communication skills and experience collaborating across research and engineering teams.

Advantages

Experience building evaluation or experimentation infrastructure for AI, LLM, or agent-based systems.
Hands-on experience with Kubernetes, Docker, AWS, and infrastructure-as-code tools such as Terraform.
Experience with distributed job orchestration, ephemeral or sandboxed environments, large-scale test execution, or observability and data pipelines.
A background in cybersecurity, AppSec, offensive security, or security research.

Why Tenzai

Working on problems that matter - Software is now written and deployed faster than it can be secured. Attackers are beginning to use AI to find vulnerabilities at scale. Tenzai exists to close that gap. It's a mission that requires elite hackers, and also sharp storytellers, wicked-smart operators, and experienced market builders.

Building a category in the making - Tenzai is defining a new category in cybersecurity. That means every team — from research and engineering to product, brand, and go-to-market — has a chance to shape how the industry understands and adopts autonomous security. If you thrive building something from zero and helping a new idea take hold in the world, keep reading.

Talent density - We believe small teams of exceptional people outperform large organizations. Tenzai was founded by veteran security experts and repeat entrepreneurs. We hire deliberately and value curiosity, initiative, and craftsmanship, whatever your discipline.

Creating real impact, quickly - Whether you're building systems, shaping product experiences, telling the story, or helping customers succeed, your work will immediately influence how organizations secure their software. We move quickly, keep teams lean, and give humans ownership.

Ambition with humility - We're tackling hard problems with a team that values deep expertise and thoughtful collaboration. Everyone here is learning, experimenting, and pushing the boundaries of what's possible. Plus, we love eating lunch together.